Scoping
Study:
Reducing
Smoke Emissions From Home Heating With Wood
Prepared for
Environment Canada
Hazardous Waste
Branch
Planning &
Coordination Division
Prepared by
Gulland Associates
Inc.
March 31, 1997
TABLE OF CONTENTS
Wood Heating Appliance Categories
2. Industry
and Market Profile
2.1 Heating Appliances and Decorative Fireplaces
2.2 Woodburning Appliance Manufacturing in Canada
2.3 Profile of Wood Energy Use in Canada
2.4 Why is Wood Heating in Decline?
2.4 Regional Variations and Patterns
2.5 Other Characteristics of the Market and the Users
3. Technology
Profile and Regulatory Environment
3.1 Background to Emissions Regulations
3.2 The Effect of Regulation on the Products and the
Market
3.3 The Positions of Provincial Governments
3.4 Implications of a Regulation
3.5 The B.C. Emissions Regulation: A Model for Canada?
4.1 The Cost of Heating With Wood
4.3 Obstacles to the uptake of advanced technologies
5. Prospects
for Reduced Emissions
5.2 How the Stakeholders Can Contribute
This
study reviews existing sources of data to profile the use of wood burning
appliances for residential heating. The
profile consists of four elements:
·
the
extent and patterns of wood energy use;
·
the
characteristics and capabilities of wood burning appliances and of the
industries that manufacture and supply them;
·
the
features and status of regulatory initiatives to reduce environmental impacts;
·
and
the constraints and opportunities that could influence efforts to promote more
environmentally friendly wood burning appliances and user practices.
Wood is
by far the most prevalent renewable energy source in Canada; about one fifth of
single family dwellings are heated to some extent with wood. Even those householders who report the use
of wood as a supplementary fuel tend to use it to provide a large part of their
total heating needs. Despite this
surprisingly high usage level, wood heating is declining in Canada. A number of reasons have been cited for the
decrease, including the appeal of improved gas hearths, the low cost of natural
gas, and negative publicity regarding the environmental appropriateness of wood
heating.
Since
wood heating regained popularity in the late 1970s in response to high
conventional energy prices and worries about security of supply, wood stove
technology has been transformed. Better
looking and performing stoves and the ability to watch the fire as it burns
have added to the desirability of using wood as a fuel for space heating of
living areas. Used this way, wood
offers good prospects for the displacement of fossil fuel consumption and the
reduction of greenhouse gas emissions.
In most regions outside large urban centres, it costs less to heat with
firewood purchased at market prices than with oil, propane, electric resistance
and wood pellets, but it is more costly than using natural gas or a ground
source heat pump (depending on electrical power rates).
The U.S.
Environmental Protection Agency (EPA) has regulated the emissions from wood
stoves and fireplace inserts since 1988 by restricting manufacture and sale to
those appliances that are tested and certified as meeting particulate (smoke)
emission limits. Wood stoves that are
laboratory tested and certified by the EPA emit an approximate average of 5
grams of particulates per hour of operation during in-home field tests. This level of particulate emissions is
between one fifth and one tenth of that emitted by conventional wood burning
stoves.
Canada
has no federal regulation or guideline that is applicable to wood heating. Responding to concerns about air quality,
the province of British Columbia adopted a regulation in 1994 that functions in
all material respects identically to the EPA standard; in fact B.C. references
both the EPA regulation and the Canadian Standards Association B415.1 standard
that is harmonized with the EPA requirements.
No other province has adopted a regulation mandating wood stove smoke
emission limits, although several have expressed interest in doing so.
The smoke
emissions from individual wood burning units are also strongly influenced by
the quality of fuel and by the operating techniques employed by users. Creative public information programs could
promote the techniques of responsible wood heating and help Canadians who heat
with wood to use them effectively.
Advanced
wood stoves that meet the EPA and B.C. requirements operate at higher
efficiencies than conventional wood stoves, resulting in annual fuel cost
savings of between $150 and $350 on firewood purchased at market prices. These substantial annual savings make
upgrading to advanced technology an attractive investment. These savings are acknowledged by industry
specialists to be a primary motivation in the decision by householders to
upgrade from conventional appliances.
Regulatory
action by the U.S., and subsequently by B.C. has had a significant effect on
the Canadian market; it is estimated that of all current wood stove sales,
somewhat more than half are of certified low emission models. The relevant industry, as represented by the
Hearth Products Association of Canada (HPAC), supports the adoption of a
national regulation similar to that adopted by British Columbia in 1994. Based on recent consultations conducted by
the HPAC, there is reason to expect that a majority of provincial ministers of
environment would respond positively to a federal regulatory initiative on wood
burning appliances. The B.C. experience
suggests that the administration and enforcement costs to support such a
regulation would be low.
Despite
the performance and environmental advantages of advanced wood heating
technologies, the older conventional technologies are still far more prevalent
in Canadian homes. Obstacles to the
uptake of advanced technology wood stoves include the absence of an emission
regulation, the higher cost of advanced stoves, resistance to change on the
part of purchasers, and a lack of information.
These obstacles could be minimized through the mechanism of a
Canada-wide emission regulation, combined with effective public information and
incentives for wood heat users to upgrade.
A
significant reduction in smoke emissions from wood heating is achievable, but
will depend on the combined efforts of a number of stakeholders. The federal government has a key role in the
establishment of a Canada-wide emission regulation, and in the formation of and
support for partnerships aimed at developing and disseminating information in
support of the public's environmentally appropriate use of wood as a heating
fuel. Likely partners include the
hearth industry, other departments or agencies of government at all levels,
financial institutions, the insurance industry and public health organizations. All the identified partners could support
and participate in programs such as stove change-outs, clean burn
demonstrations, and programs to distribute public information.
The
research for this study revealed that there is inadequate information available
on how Canadians use wood fuel to heat their homes. More specific information on the attitudes of the users, the
types of appliances currently in use, and the way they are used is needed to
guide the development of effective public education materials. Research into the performance
characteristics of the various appliance types is also needed. These two data sources—user profiles and
appliance characteristics— are required to develop projections of environmental
impacts and as a base line against which to measure progress in reducing
negative impacts.
Wood
ranks as the fourth most popular home heating fuel in Canada, after gas,
electricity and oil. About one in five
single family dwellings is heated to some extent with wood. Householders who heat with wood attract
little attention from the media or from government, and the companies that
supply equipment and fuel are small, widely disbursed and low-profile. As a result, the significant contribution of
wood to the residential energy supply mix can be surprising, even to those with
some involvement in housing and energy issues.
Wood
heating does tend to attract media and government attention when wood smoke
causes noticeable impacts on local air quality or when nuisance smoke emissions
cause friction between neighbors. The
periodic complaints about smoke pollution from wood burning create the image of
wood as a sort of delinquent heating fuel, the use of which, some say, should be
minimized for environmental reasons.
Wood may also be viewed as an old-fashioned, rather crude way to heat
houses, and therefore expendable because other heating options are readily
available and have no discernible environmental impacts at the point of
use. And, in light of publicity campaigns
that promote urban tree planting and rural reforestation programs, and that
condemn clear-cut logging, the image of people cutting down trees and burning
them, even for heat, is no longer a positive one. The identification of wood heating as a problem to be solved,
rather than as one of the four key residential energy options, could create a
policy dilemma for governments and therefore raises the question: Are there strategic benefits from the
continued use of wood as a heating fuel?
Wood is
defined as a renewable energy source, along with wind, solar, hydroelectric and
geothermal energy. As one of the few
renewable energy sources—each of which has regional and/or site-related
limitations—wood can at least be seen as a potentially strategic fuel. Canada's reliance on fossil fuels such as
oil, gas and coal makes it among the world's highest per capita emitters of
carbon dioxide, the principal greenhouse gas.
Both energy and forestry scientists agree that, provided harvesting is
conducted in a sustainable manner, the combustion of wood for energy uses
contributes no net carbon dioxide to the atmosphere when the normal forest
regeneration period is considered.
The 1992
United Nations Conference on Environment and Development (UNCED) in Rio was the
site of an historic international agreement to stabilize greenhouse gas
emissions at 1990 levels by the year 2000.
One of the UNCED documents states:
The need to control atmospheric emissions of
greenhouse and other gases and substances will increasingly need to be based on
efficiency in energy production, transmission, distribution and consumption,
and on growing reliance on environmentally sound energy systems, particularly
new and renewable sources of energy.1
Wood
energy could serve as one of the strategic options in the effort to reduce
greenhouse gas emissions from fossil fuel combustion. The Canadian government and the public have used wood energy
strategically in the past. In the late
1970s, when oil prices rose rapidly and there were widespread concerns about
the security of energy supply, hundreds of thousands of Canadian households
fell back on wood as a reliable energy source that sheltered them from the
uncertainties of the conventional energy market. They were assisted in doing so through the Canada Oil
Substitution Program, a component of the National Energy Program. If, in the face of mounting evidence of
global warming/climate change and the continued rise in greenhouse gas
emissions, government is forced to employ the tax system to create disincentives
for the consumption of fossil fuels, the public would undoubtedly turn again to
wood as a secure and price-stable energy source. But exchanging greenhouse gas emissions for poor air quality due
to more wood smoke emissions would not be a desirable outcome. This raises the question: Under what conditions can wood be used as an
environmentally appropriate fuel?
Wood
should be viewed as a conditionally renewable energy source in the sense that
wood fuel acquired using unsustainable forestry practices is not truly
renewable. Sustainable energy
production from trees was addressed in a 1993 paper titled, "Residential
Wood Heating: the Forest, the Atmosphere and the Public Consciousness",
in which criteria for the consideration of wood as an environmentally
appropriate fuel were offered:
·
An
increase in the use of wood as a fuel for residential heating can occur within
the framework prescribed by current principles of environmental
sustainability. This framework could be
generally described by the following points:
·
The
integrity of the forest, including the trees, the soil and the site, is
maintained.
·
Species
diversity within the managed forest is maintained or enhanced.
·
The
requirement for the use of non-renewable fossil fuels is reduced, resulting in
reduced concentration of greenhouse gases in the atmosphere.
·
Air
shed pollutants are minimized and those that are released do not produce health
impacts on the population.2
The first
two points in the list above are important and deserve attention, but they are
not addressed in this report. The third
point, that greenhouse gas emissions be reduced by fossil fuel displacement,
suggests that wood should be converted to usable energy at the highest
practical efficiency. That, and the
fourth point recommending that air pollution be minimized are key aspects of
this report and are discussed in the context of the conversion technologies
(stoves, etc.), their performance characteristics and the householders who use
them to heat their homes.
This
report gives an overview of how wood fuel is used in Canadian homes. Special attention is given to initiatives
designed to reduce the environmental impacts and increase the effectiveness of
wood burning for home heating. Its
function is to provide background information to assist in the analysis of
environmental policy options.
WOOD STOVE or Space Heater or "Airtight" |
A free-standing appliance designed to heat the space in which it is
installed and adjacent spaces. Wood
stoves, also called woodburning space heaters and colloquially as airtights,
are by far the most common wood heating device in Canada, used by almost 90
percent of households that use wood for heating. Advanced low emission, high efficiency wood stoves are readily
available on the Canadian market. |
FIREPLACE INSERT |
An insert is essentially a wood stove that is adapted by the
manufacturer for installation within or partly within the hearth area of a
masonry or factory-built fireplace. A
properly installed insert of good design can deliver heating performance on
par with a wood stove |
ADVANCED FACTORY-BUILT
FIREPLACES |
Unlike conventional metal or brick fireplaces that deliver very low
heating efficiency, advanced fireplaces perform at about the same efficiency
and smoke emissions levels as advanced wood stoves, so they can be used for
serious home heating. |
PELLET STOVE |
Pellet stoves burn a manufactured fuel made of dried, compressed wood
"flour", processed from sawdust.
An electric motor driven auger moves the fuel from an integral hopper
to a small combustion chamber. Pellet
stoves operate with low particulate emission levels. |
MASONRY HEATER |
Evolved from a European tradition, more masonry heaters have been
built in Canada in recent years.
Although they have specialized operating characteristics, masonry
heaters have been shown to produce very low particulate emissions and deliver
good performance for serious heating. |
CENTRAL HEATING SYSTEMS |
Wood-fired central heating systems are available in several forms:
add-on furnaces for connection to existing oil or electric furnaces;
combination furnaces that burn oil or electricity in addition to wood; and
boilers that heat water and use a system of pipes to distribute the
heat. Central heating with wood is
not as common today as it was 20 years ago. |
WOOD COOKING RANGE |
A specialized appliance that uses wood fuel to heat a cook-top
surface, a bake oven and sometimes, a reservoir for domestic hot water. Cooking ranges are not common in Canada,
although a few models are still available for sale in specialty stores. |
OUTDOOR BOILER |
Gaining popularity recently, particularly in rural Manitoba and
Ontario, outdoor boilers are contained in a small shed and use insulated
underground piping to deliver heat to the house. They are controversial because they tend to emit high levels of
airborne particulate matter. |
Wood can
be burned solely for the pleasure of viewing the fire in a fireplace that, with
a net efficiency of around zero, is strictly decorative by design. At the other end of the spectrum, wood can
be burned in a device boasting a seasonal efficiency of 75 percent and which is
easily capable of heating an entire house.
The range in heating performance of the wood burning appliances
currently in use is extremely wide, so distinguishing between various types
according to heating capability and usage patterns is a key part of estimating
the use of firewood for either aesthetic or heating purposes and projecting the
environmental impacts of this use. A
failure to account for these variations would introduce significant distortions
in any estimate.
The task
of differentiating decorative from heating appliances is not as simple as
labeling all fireplaces as decorative and considering the rest — wood stoves,
furnaces, boilers, cooking ranges, and so on — as heating appliances. Such a simple analysis is contradicted by
the fact that the most efficient and effective wood heating devices available
today are highly decorative fireplaces and wood stoves that look entirely
appropriate installed in a well-appointed living room.
The
presence of two physical characteristics tends to separate decorative
appliances from heating devices. First,
wood heaters have a means to control the flow of combustion air to the fire
permitting the user to regulate the rate of burn; and second, they have a means
of transferring heat from the exhaust gases to the room. Decorative appliances have neither
characteristic. One exception to these
criteria is a masonry heater, which does not control combustion air flow, but
compensates with a massive heat exchanger that captures the fire's heat for
slow release over several hours.
Statistics
Canada tracks wood burning appliance production in its quarterly report,
Shipments of Solid Fuel Burning Heating Products (Catalogue 25-002)3.
The publication includes a listing of reporting manufacturers. The list for the last quarter 1996 edition
shows the following distribution of manufacturers by province:
Nova Scotia
5
New
Brunswick 2
Quebec 8
Ontario 16
Manitoba 2
Alberta 1
British
Columbia 7
Total 41
See
Appendix A for the names and cities of these appliance manufacturers.
The wood
burning appliance manufacturing sector grew quickly in the late 1970s and early
1980s in response to strong market demand.
Wood stove production peaked in 1984 at 79,000 units and fireplace
production peaked in 1987 at 61,000 units, according to the Statistics Canada
report on shipments of these products.
The
number of wood burning appliance manufacturers in Canada has been falling
gradually since the "boom years" of the mid-1980s. Since then there has been a steady decline
in production, most notably of decorative factory-built fireplaces which have
been largely replaced in the marketplace by gas fireplaces. In 1996, about 40,000 wood stoves and only
about 8,400 factory-built fireplaces were produced, according to Statistics
Canada (Figure 1). Fireplace insert sales
have gradually declined from a high of 17,000 units to 5,700 in the decade
between 1986 and 1996. The production
of wood burning central heating appliances like furnaces and boilers has
dropped from a high of about 22,000 in 1982 to the 1996 figure of 4,000.
The
Statistics Canada quarterly report was updated in 1996 to include the
production of pellet burning stoves; it reported that 1,749 pellet stoves were
shipped from Canadian manufacturers plants last year. This figure is included in the total of wood stoves produced in
the accompanying graph.
Figure
1. Shipments of Woodburning Appliances from Canadian Manufacturers
1982 - 1996, in thousands of units
Source: Statistics Canada quarterly report, Shipments
of Solid Fuel Burning Heating Products (Catalogue 25-002), 1982 through 1996
According
to the Statistics Canada report on appliance shipments, the value of exports of
all categories of wood burning appliances in 1996 was $11.7 million on a total
production value of $38.7 million, or 30 percent of the output from Canadian
manufacturers. The percentage that
exports represent of total production appears to be rising; in 1992 exports
were 17 percent of the total, in 1993 they represented 21.8 percent, and in
1994 they rose to 24 percent. The
dramatic drop in total production in 1996 to 58,000 from 76,000 the year before
accounts for the abrupt increase in the percentage of exports; in fact, the
value of exports has held steady since 1994.
This
significant drop in production of wood burning appliances in 1996 was not
reflected in the interviews conducted for this study with wood stove retailers
and distributors, most of whom claimed sales in the 1996 year were either
stable or up from previous years. It is
possible that the drop in shipments for 1996 reflects the selling through of
unsold inventory from the previous year, a year in which sales were lower than
in 1996, according to some commentators.
It is
apparent that Canada has a balance of trade surplus with the United States in
wood heating appliances. Imports
represent a relatively small part of the overall market, with U.S. and European
products filling niche markets. For
example, cast iron stoves of advanced design are probably the most significant
product category to be imported and they are widely available in stores across
Canada. Imports dominate this product
category because there is no Canadian manufacturer of advanced cast iron
stoves. There is no reliable source of
statistics on the number of imported wood heating appliances, but industry
observers interviewed for this project estimate the volume to be in the 5,000
to 15,000 range. Several lines of
pellet stoves are also imported from the United States, but the entire pellet
stove market is small, estimated to be in the 3,000 to 5,000 range each year.
The primary
source of statistical information on wood heating is the annual Statistics
Canada report on Household Facilities and Equipment (Catalogue no. 64-202)4. Each year the report provides statistics on
the principal fuels and equipment used to heat Canadian homes. One year in five the report expands to
include figures for fuel and equipment used for supplementary heating. Fortunately, the report for 1996 presents
figures for supplementary heating, and this makes the wood usage profile in
this report more useful and current because much of the wood burned in Canada
is used to supplement heating provided by other fuels.
Natural
Resources Canada (NRCan) conducted a comprehensive
survey of energy use patterns in Canadian houses. Its report, titled 1993
Survey of Household Energy Use5, provides more details on usage
patterns than the standard Statistics Canada annual reports.
Some
provincial governments have conducted various types of surveys which may be
useful for specific purposes, but the Statistics Canada and NRCan surveys are
the most useful because they provide a national overview, and in the case of
the annual Statistics Canada survey, provincial figures.
Table 1.
shows comparative figures for 1991 and 1996 on the number of households using
wood for heating by province, the percentage of single family dwellings heated
with wood and the percent change between 1991 and 1996. The usage percentages are compared with the
total of single family dwellings (not all dwellings) because 99.7 percent of
home heating with wood occurs in houses rather than apartments. The popularity of wood as a home heating
fuel varies widely across the regions of Canada.
Table
1. Distribution of Residential Wood Heating in Canada
Comparative figures for 1991 and 1996
|
Total Single |
Wood as Principal Fuel |
As Supplementary Fuel |
% of houses |
|
||||||||
|
Family Dwellings |
# in |
000s |
% of |
total |
# in |
000s |
% of |
total |
using wood |
% |
||
|
1991 |
1996 |
1991 |
1996 |
1991 |
1996 |
1991 |
1996 |
1991 |
1996 |
1991 |
1996 |
Change |
CA |
6701 |
7872 |
426 |
398 |
6% |
5% |
956 |
941 |
14% |
12% |
21% |
17% |
-4% |
NF |
154 |
172 |
41 |
34 |
27% |
20% |
27 |
23 |
18% |
13% |
44% |
33% |
-11% |
PEI |
37 |
44 |
7 |
5 |
19% |
11% |
11 |
12 |
30% |
27% |
49% |
39% |
-10% |
NS |
255 |
283 |
40 |
35 |
16% |
12% |
55 |
56 |
22% |
20% |
37% |
32% |
-5% |
NB |
206 |
234 |
40 |
42 |
19% |
18% |
52 |
47 |
25% |
20% |
45% |
38% |
-7% |
QC |
1365 |
1593 |
113 |
140 |
8% |
9% |
411 |
393 |
30% |
25% |
38% |
34% |
-4% |
ON |
2488 |
2999 |
93 |
81 |
4% |
3% |
200 |
221 |
8% |
7% |
12% |
10% |
-2% |
MB |
298 |
335 |
14 |
14 |
5% |
4% |
24 |
23 |
8% |
7% |
13% |
11% |
-2% |
SK |
297 |
316 |
10 |
6 |
3% |
2% |
16 |
15 |
5% |
5% |
9% |
7% |
-2% |
AB |
710 |
844 |
6 |
- |
1% |
- |
41 |
28 |
6% |
3% |
7% |
- |
- |
BC |
892 |
1053 |
61 |
37 |
7% |
4% |
119 |
123 |
13% |
12% |
20% |
15% |
-5% |
Source: Statistics Canada Report,
Household Facilities and Equipment, Catalogue 64-202, 1991 & 1996 |
The 1993
NRCan survey produced considerably higher figures than either the 1991 or 1996
Statistics Canada surveys, particularly on the use of wood as the principal
heating source. The NRCan survey found
80 percent more households that use wood as a primary heat source than the
Statistics Canada figures for 1991, and 97 percent more than the annual survey
reported in 1996. The cause of these
large differences has not been determined, but the NRCan survey is to be
repeated using data to be collected in late 1997. The results may serve to confirm or modify the relative
differences between the two surveys.
Table 2. below shows a comparison of summary figures from the 1991 and
1996 Household Facilities and Equipment surveys, and the 1993 NRCan survey.
Table
2. Comparative Figures from Three Surveys on Home Heating with Wood
|
StatsCan 1991 |
NRCan 1993 |
StatsCan 1996 |
Primary |
426 |
767 |
389 |
Supplementary |
956 |
1005 |
941 |
Total |
1382 |
1772 |
1330 |
% of s.f. dwellings |
20 |
25 |
17 |
Source:
Statistics Canada Report, Household Facilities and Equipment, Catalogue 64-202,
1991 & 1996; Natural Resources Canada 1993 Survey of Household Energy Use
There has
been a general decline in the use of wood for both primary and supplementary
heating since 1991. Whereas 21 percent
of those living in single family dwellings reported the use of wood as the
principal or a supplementary heat source in 1991, five years later only 17
percent reported using wood. There was
a larger reduction in the use of wood as the principal heating fuel than as a
supplementary fuel.
Sales of
all categories of wood burning equipment declined during 1996, according to a
survey of Canadian hearth retailers reported in the March 1997 edition of
Hearth and Home Magazine6. Although the decline in wood
stove sales, which is the largest category, was less than one percent,
factory-built fireplace sales dropped 9 percent, cook stove sales fell 7
percent and pellet stove sales were also off 7 percent from the year
before. The statistical findings of the
Hearth and Home survey may not be fully representative because it is based on a
small sample of specialty retailers only.
Although
there are no survey results explaining why Canadians are moving away from wood
as a heating fuel, most of the hearth professionals interviewed for this study
cited three main reasons: more acceptable alternative hearth options, the
availability of low cost conventional fuels — mainly piped gas — and an
increasingly negative public attitude regarding the environmental implications
of heating with wood.
Although
gas fireplaces have been available for many years, it has only been in since
the late 1980s that the designers of these appliances have succeeded in
producing a simulated wood fire that is an aesthetically acceptable alternative
to a real wood burning fireplace. Using
ceramic or pressed fibre artificial logs, simulated charcoal beds that glow
red, and sophisticated burners that produce a realistic yellow flame, gas
fireplace makers have achieved a gas fire that is surprisingly similar to a
wood fire. The energy efficiency of
these gas fireplaces has also improved with the introduction of direct-vent,
sealed combustion technology, which also makes installation simple because
these units are side-wall vented, needing no chimney. The technical and aesthetic advances in gas technology combine to
make a gas fireplace an attractive option, particularly for householders living
in urban or suburban areas.
Gas
distributors, which are large and well-financed companies, have embraced the
gas fireplace as a good way to increase load and monthly billings as well as
appliance sales at their company stores.
The marketing of these fireplaces is aggressive, with flyers regularly
reaching every household served by the distribution network and offering
discounts and attractive payment terms that represent relatively modest
increases in the monthly gas bill.
These utilities invariably market gas fireplaces against wood burning
units by emphasizing the cleanliness, safety and automatic convenience of gas
fireplaces. In contrast, the marketing
of wood burning appliances is done mostly by small, specialty retail stores
that lack the corporate marketing strength of the gas utilities.
During
the 1990s the piped gas network has been expanded into areas where wood burning
had been popular. Two of many such
examples are the Highway 17 corridor in the Ottawa Valley and Victoria Island
in B.C. In both cases the novelty of
gas fireplaces and the low cost of the fuel has driven strong sales of gas
hearths to replace wood burning units.
Provincial
lung associations across Canada have established publicity programs that tend
to discourage Canadians from heating with wood because of the perceived threat
of indoor smoke pollution that can inhibit lung function in small children and
can worsen lung problems in older adults.
The combined result of aggressive anti-wood marketing by gas
distributors and hearth dealers, and cautionary messages from health
organizations has been to challenge previously positive public attitudes
towards wood burning.
Since low
cost piped gas is not available in the Atlantic provinces, there must be other
explanations for the most dramatic percentage reduction in wood use that have
occurred there, particularly in Newfoundland and PEI. A retailer who sells mostly propane fireplaces in St. John's gave
several reasons for the 11 percent drop in wood use since 1991. He said that wood stoves are messy, unsafe,
require too much work and the provincial government has enforced restrictions
on firewood cutting on the Avalon Peninsula, which has pushed up the cost of
firewood. It is no surprise, therefore,
that people shopping for a hearth in St. John's may not receive a positive
sales presentation about wood heating.
Despite
the reduction in usage in the past five years, Newfoundland still has among the
highest provincial concentration with 20 percent reporting wood as their
primary heating source and a further 13 percent using wood to supplement other
fuels. This total of 33 percent of
houses is a dramatic drop from the 44 percent reported in 1991. There was also a significant decline in
reported usage on Prince Edward Island, from 49 to 39 percent of houses.
Householders
in both Nova Scotia and New Brunswick have been consistent users of wood fuel
for heating. The decline in reported
usage is more moderate in these two provinces at only 5 percent and 7 percent
respectively. Dealers in the Atlantic
provinces report the increasing popularity of propane gas fireplaces for their
convenience and cleanliness, despite the high cost of the fuel.
Quebec
has a high frequency of wood burning and, in contrast to the general decline in
wood use, there was a significant increase in the number of households
reporting wood as the principal heating fuel: from 113,000 households in 1991
to 140,000 in 1996. A reduction in
supplementary heating with wood and the increase in the number of households in
the province combined to produce an overall reduction in wood usage of 4
percent.
Only
three percent of those living in Ontario houses report wood as their principal
heating fuel and only 7 percent use wood as a supplementary fuel. This is the third lowest provincial
frequency of wood fuel usage after Saskatchewan and Alberta. From 1991 to 1996, the number of people
using wood as their principal heating fuel fell by 12,000, while there was a
21,000 household increase in the use of wood for supplementary heating.
Heating
with wood is not popular in the prairies, yet this is the region with the least
drop in usage during the five year period under review. The stable usage may indicate that only a
core group of householders remain; those whose location and/or income level
make wood heating the most practical option.
Between
1991 and 1996 there was a massive reduction from 61,000 to 37,000 in the number
of people using wood as their primary heating fuel, possibly a result of
negative publicity about wood heating and air pollution. During this five year period, British
Columbia established a mandatory emission regulation for woodburning appliances
and this action might have sent a signal to the public that wood heating is not
desirable. There was a small increase
in those using wood as a supplementary fuel since 1991, possibly reflecting a
shift in usage within individual households.
Wood burning in the lower mainland around Vancouver has declined substantially,
but it remains fairly popular in the interior and the northern part of the
province. A distributor of wood stoves
in B.C. noted that periodically the media picks up wood smoke stories from
Washington state where wood smoke emissions regulations are among the most
aggressive in the U.S. Rumours that
wood burning will soon be banned circulate on a regular basis, and although no
basis in fact exists, the result is to suppress wood stove sales.
No usage
statistics are available for the northern territories, although it is known
that wood remains an important fuel in areas where trees are abundant. A retailer in Whitehorse, Yukon reported
that wood burning appliance sales have been flat recently while sales of high
efficiency oil-fired heaters has increased.
About 60
percent of principal wood heating appliances are wood stoves, 33 percent are
forced air furnaces and 2 percent are boilers.
Almost all (98.5 %) householders who use wood as a supplementary fuel do
so with a space heating stove. This
category would probably include some fireplace inserts, which are essentially
wood stoves adapted to fit into masonry fireplaces. Wood is used as a cooking fuel by 51,000 households according to
NRCan and by 30,000 according to StatsCan.
The NRCan
Household Energy Use Survey found that 31.2 percent of those living in houses,
or 2.2 million households, reported having a woodburning fireplace. While that figure is undoubtedly falling due
to gas conversion, when added to those who heat with wood, it reveals that an
impressive number of Canadians have owned and operated wood burning devices.
Wood
burning appliances used for primary heating tend to be newer than other heating
appliances: according to NRCan 1993, 70% of wood appliances for primary use are
less than 10 years old; StatsCan finds that 58 percent are less than 10 years
old. In contrast, more than 60 percent
of all other principal heating systems are more than 10 years old. Wood stoves used for supplementary heating
are also relatively new: 62 percent are 10 years old or less. This finding implies that people change
their wood stoves with some frequency, although there are no data to suggest
why. Part of the reason could be that
during the last 10 years in particular there have been significant improvements
in aesthetic appeal and performance of wood stoves and, since many of these
stoves are in living spaces rather than basements, this may have prompted
homeowners to trade up from the "black box" wood stove they bought in
the late 1970s or early 1980s. If this
analysis were proved correct, it might also suggests that if people knew more
about the new technology wood stoves, they might upgrade, not just to reduce
smoke emissions, but to take advantage of all the other improvements in the
technology, like clear door glass, higher efficiency and more attractive
designs.
People
who heat with wood keep their houses almost one degree warmer during the day
than all others: the average daytime temperature for a wood heated house is
21.3°C and the average evening temperature is 21.6°C. The average temperature over night is about the same as for other
energy sources at 19.1°C. Source: NRCan
1993.
Wood heat
specialists over the years have speculated about what householders really mean
when they indicate the use of wood as a supplementary fuel in the home. Theoretically, supplementary use could mean
very occasional use, perhaps only once or twice a month or supplying only 5 to
10 percent of total heating requirements.
It has been reported that the term supplementary can be misleading
because of the influence of home insurance companies. Many insurers impose a significant surcharge on policy holders
claiming wood as a primary heating source.
Families that use a wood stove to provide a large majority of heating
needs, but have a central heating system for back up heating, may claim the
wood stove is only used as a supplementary source to avoid paying higher home
insurance premiums. Others may think of
their extensive, complex and automatic oil, gas or electric furnace the primary
system even though they use a wood stove to supply the majority of home
heating.
The NRCan
study sheds light on this issue and offers some surprises. It reveals that Canadians who report the use
of wood as a supplementary fuel use it to provide a large part of their total
heating needs. For example, 60 percent
report using their stove more than four hours per day in winter, and a further
15 percent use theirs between one and four hours each day. With 75 percent using their stove every day,
this is much more than casual supplementary use. Wood consumption figures confirm this finding. Fully 40 percent of supplementary users
report consuming four or more cords per year, a high figure considering that
four cords can be enough fuel to heat a small house for an entire winter. A further 29 percent of supplementary users
consume between one and three cords of wood per winter. About half report heating the entire house
with their wood stove, while a further 35 percent heat only the basement. Electricity is the main energy source being
supplemented in Canadian homes (53%) followed by oil (22%).
Given the
general decline in the use of wood for heating in all regions of Canada, it
follows that relatively few people are switching to wood from other fuels. Fuel switching is usually motivated by price
variations and, except for an increase in propane prices in the 1996/97 winter,
most energy prices have held steady for several years. In fact, specialty retailers suggest that
one of the more significant shifts in hearth usage in the past few years is
from wood to gas as homeowners remove wood stoves and fireplace inserts and
replace them with appliances that burn piped gas or propane.
The
purchase of a new wood burning appliance is more likely to be motivated by the
need or desire to upgrade an existing unit or to include a wood heater in a new
house or renovated space. The retailers
interviewed for this study confirmed that fuel switching is not usually a
primary reason to purchase, but that upgrading from existing units is a
significant component of the market, as are changing houses, building new
houses and renovating existing houses.
The
motivations behind the purchase of a new wood burning appliance can be more
complicated than for other energy sources.
For conventional heating equipment like oil and gas furnaces or electric
baseboard heaters, the initial equipment cost and the cost of the fuel are the
primary factors influencing the purchase.
But for wood burning equipment other influences can come into play. Since the majority of wood burning
appliances are space heaters located in living areas rather than central
furnaces hidden in utility rooms, the look of the appliance is an important
consideration at the time of purchase.
The development in the mid-1980s of effective "air wash"
systems for the glass panels in firebox doors had an important impact on the
use and performance of wood burning space heaters. With clear glass for unobstructed fire viewing, the wood heater
was no longer a plain box, but became an attractive and desirable part of the
living or family room decor.
The steep
rise in oil prices during the 1970s and early 1980s triggered a rebirth of wood
as a home heating fuel after decades of decline. Hundreds of wood stove manufacturers sprang up all over North
America to meet the public's seemingly insatiable demand for these simple,
low-cost appliances, most of which were of welded steel construction. The stove manufacturers of the time boasted
of the high efficiency of their products, but this was mostly based on the fact
that gasketed loading doors allowed control of combustion air flow and made
longer burn cycles possible. The term
"airtight", as these stoves were called, was equated with
efficiency. Some manufacturers did
experiment with baffles, various gas flow patterns and the use of firebrick
linings, features designed to improve combustion efficiency.
The full
negative effects of residential wood burning became evident when hundreds of
households located in mountain valley towns of the Pacific Northwest of the
U.S. operated inefficient, smoky stoves during winter days characterized by
cold, stable air masses. The
combination of mountainous topography, a stagnant air shed, and a high local
concentration of inefficient wood burning produced intolerable densities of
smoke in several communities. State
regulators, and in particular the Oregon Department of Environmental Quality
began to research the problem under intense pressure to take action.
Since
investigating, charging and prosecuting individual householders for air
pollution violations would have been costly — and controversial because of
individual rights issues — other strategies to reduce emissions had to be
found. Some preliminary research had
shown that significant improvements in wood burning technology were possible,
so it was decided by the Oregon DEQ to develop a regulation that would mandate
the best available pollution control technology. This would be done by requiring all stoves sold in the State to
have been laboratory tested and certified as producing smoke emissions during
normal operation that were at or below the limits set by the legislation. Although consideration was given to
regulating carbon monoxide and other pollutants, eventually it was decided to
regulate only particulate emissions, regardless of type.
When
Oregon regulators served notice that they would regulate wood smoke emissions,
stove manufacturers embarked on concerted efforts to develop clean burning wood
stoves. The development of a practical,
repeatable test to form the basis of a stove certification program was
difficult and controversial because of the complexities of batch-fed, solid
fuel combustion and the compromises inherent in any test and measurement
method. Finally, a test was developed
and adopted by the State of Oregon which enforced a stove certification program
in 1986. With some modifications, the
method was subsequently adopted by EPA and enforced nationally in two stages
referred to as Phase I in 1988 and Phase II in 19907.
In addition
to the stove regulation, the state and local authorities developed publicity
and incentive programs to encourage householders to upgrade their wood heating
equipment. Also, in mountain valley
communities with serious wood smoke pollution problems, so-called
"No-Burn" days would be announced when stagnant air caused by thermal
inversions would trap smoke close to ground level. Under these local ordinances, householders with the new certified
wood burning stoves would be permitted to continue using them throughout the
no-burn period. This feature of the
rules served as an additional incentive to upgrade to the new equipment. Communities such as Comox, B.C. have used
similar municipal legislation to reduce wood heating emissions during episodes
of poor air quality.
Briefly,
the EPA test protocol calls for precisely-specified dimensional Douglas Fir
cribs to be assembled and loaded on a live coal bed that is less than 15
percent of the weight of a full wood load; a 5 minute period is allowed to make
adjustments according to the manufacturer's operating instructions, then the
combustion air control is set to produce one of four prescribed firing rates:
low, medium low, medium high and high.
The lowest burn rate is very low; less than one dry kilogram per
hour. This cyclical testing is repeated
until there is a record of one valid run in each of the four required burn
rates. Throughout the testing the
exhaust gas is diluted with air according to a prescribed ratio and a sample of
this stream is drawn through filters of known weight. The difference in filter weight is used to project total
particulate emissions. The test results
are expressed in terms of grams per hour of particulate emissions. This form of appliance emission rating
permits projections of total air shed impacts to be made.
In 1994
British Columbia adopted a regulation under its Waste Management Act which is
functionally identical to the EPA requirements. The motivation for B.C.'s regulatory initiative were serious
concerns about air quality in the lower mainland and evidence of air quality
problems in some cities in the interior.
Of all the regions in Canada, the mountainous topography of B.C. is the
closest to that of the U.S. Pacific Northwest where wood heat-related pollution
was first identified and regulated.
More detail on the B.C. wood stove regulation is provided later in the
report.
The EPA
regulation was designed to include all wood stoves and fireplace inserts
because these were seen to be the main heating appliances and the main source
of air pollution because their firing rate can be reduced to a smolder, which
releases high concentrations of airborne particulates into the
environment.
Through
an exemption for appliances with a burn rate over 5.5 kg/h or a fuel/air ratio
in excess of 35:1, decorative fireplaces are provided an exemption from the EPA
rules. Central heating appliances like
furnaces and boilers, as well as cooking ranges are exempt from the regulation
on the grounds that they exist in small numbers and regulation would cause
excessive hardship for users. As a
result of this exemption, there has been virtually no improvement in the
combustion technologies used in furnaces and cooking ranges. A few manufacturers have developed low
emission/high efficiency fireplaces which they have voluntarily certified to
EPA requirements to reach a specific market niche.
Stove
makers used one of two main strategies in meeting the new emissions
requirements: catalytic technology or advanced, non-catalytic technology. In a catalyst-equipped stove, the exhaust
gas is passed through a ceramic honeycomb element coated with platinum or
palladium. Proximity to the catalyst
has the effect of lowering the ignition temperature of some components of the
smoke. Advanced technology stoves—or
non-catalytic as they are called in the trade—use firebox insulation,
comprehensive baffles and pre-heated combustion air supplied strategically
around the firebox, typically through perforated pipes, ducts or chambers, to
achieve low emissions. The expected
reduction in catalyst performance over extended periods prompted regulators to
impose a more stringent particulate emission limit for catalytic appliances:
4.1 g/h compared to 7.5 g/h for advanced stoves. These are the legislated limits for particulate emissions in both
the United States and British Columbia.
Field
tests of the certified low emissions stoves built before 1990 revealed problems
of premature degradation due to heat stressing of internal components. Some early catalytic stoves had damper and
damper frame failures which allowed smoke to bypass the catalyst. There were also fears of premature catalyst
degradation. Advanced technology stoves
also showed premature degradation during field tests in the late 1980s,
although the warping and erosion of baffles had less effect on emissions
performance than the failures with catalytic appliances.
The
durability of low emission stoves has improved considerably so that today,
premature stove degradation is not viewed as a big problem. In most new stoves today, vulnerable parts
can be replaced and manufacturers now use more heat-resistant materials such as
ceramics and stainless steel. The
performance and durability of catalytic stoves has also improved through better
design and use of materials. The useful
life of a wood stove catalytic element is estimated to be 9,000 to 12,000
hours, or three to five years of use, depending on heating demand, user skill
and degree of maintenance provided.
Wood
pellets are dried wood flour extruded into small glazed cylinders about 6 mm in
diameter and random lengths up to about 30 mm.
The heat and pressure of the extrusion process reforms the natural
lignin in the wood to act as a binding agent; feedstock additives are not
normally used by pellet manufacturers.
A pellet stove consists of a fuel hopper having a capacity of about 20
kg with an auger at its base that either pushes or drops the pellets into a
small perforated bowl through which combustion air flows. Combustion of a small amount of fuel is
continuous as new fuel enters the combustion bowl and ash is blown or pushed
out by the combustion process. Field
testing has shown that properly operating pellet stoves produce low emission
levels; usually under 2 g/h. Only a few
pellet stoves have been EPA certified.
Most manufacturers use the 35:1 air/fuel ratio exemption to avoid the
process. The high air/fuel ratio would
tend to limit thermal efficiency.
Now,
about fifteen years after the search for improved wood combustion technology
began in a concerted way, the performance gains are impressive. To assist in the discussion and analysis of
the various wood burning technologies, three simplified categories of appliance have been offered in Table 3. The table presents high, medium and low
efficiency ranges, suggests the wood burning technologies that would fit within
each range and provides the average particulate and carbon monoxide emissions
for the technologies. Since there will
always be exceptions to such general categories, the table is not intended to
be definitive, but rather a helpful tool for classifying and analyzing the
range of available equipment.
Table
3. Summary of Woodburning Appliance
Categories and Performance
Efficiency Range |
Appliance Category |
Average Emissions |
HIGH 60% to 80% |
· EPA/B415 certified space heaters · EPA/B415 certified fireplace inserts · EPA/B415 certified fireplaces · Pellet stoves · Masonry heaters · |
·
EPA/B415 catalytic: pm* 6.5 g/h**;
CO*** 44.7 g/h ·
EPA/B415 non-cat: pm 5.1 g/h; CO 77.0
g/h ·
Pellet stoves: pm 1.1 g/h; CO 13.8
g/h ·
Masonry heaters: pm 3.0 g/h; CO 40
g/h · |
MEDIUM 30% to 60% |
· Space heaters (airtights) · Wood furnaces and boilers · Cooking ranges · Fireplaces with gasketed doors and heat exchanger · |
·
All conventional closed combustion
stoves, various studies; pm low of 19.6 g/h; high of 41.4 g/h; CO 165 g/h · |
LOW DECORATIVE -10% to 30% |
· Fireplaces with loose doors and/or no heat exchanger · Free-standing fireplaces · Open fireplaces · |
·
Laboratory tests of open fireplaces:
pm 44g/h; CO 267 g/h · |
Source: References 8 & 9
Notes: * particulate matter; ** grams per hour; ***
carbon monoxide
There has
been a long-standing debate regarding the emission rate of conventional
equipment since this forms the baseline for all subsequent emission reduction
efforts. Since all tests of wood
burning equipment are costly because of the need for specialized equipment, and
since in-situ, real world tests are particularly costly, relatively few have
been done. The figures given in Table
3. as the range of particulate emission rates for conventional, medium
efficiency appliances (low of 19.6 g/h and a high of 41.4 g/h) and in
particular the average of 25 g/h used by the EPA have been highly controversial
and are still disputed by industry, which claims the average is closer to the
high value of about 40 g/h. These
emission figures were the average of continuous samples taken over a period of
a week in wood heated houses. Unusually
low emission figures can result if the weather during the test period is
especially cold, because the resulting higher average fuel firing rate is
associated with a cleaner burn and lower emission rate. Distortions in performance can also occur if
the user of the system being tested is on "best behaviour" during the
week of testing. Finally, the accepted
emission rates include only conventional stoves, ignoring cooking ranges,
furnaces, boilers and outdoor boilers, which there is reason to believe may
produce higher emissions than space heating stoves. No attempts have been made to test and profile the average
emissions rate of a given appliance over the range of conditions experienced in
a typical heating season.
The
debate about the appropriate base performance figures for conventional
equipment highlights a recurring theme in all discussions of wood burning
appliance emissions: that very little field research has been done into
emission levels, the characterization of emission constituents and the extent
to which changes in various parameters affect performance. Little is known, except in general terms,
about the affect of, for example, firing rate, fuel moisture content, fuel
species, heating system design and so on.
A good example of the weakness of data used for projections of wood
burning emission impacts is reflected in the response by the U.S. Hearth
Products Association (HPA) to EPA's 1996 Polycyclic Organic Matter (POM)
Emission Inventory for Residential Wood Combustion (see Appendix E). In HPA's challenge it is noted that in the
EPA draft report, the emission factor for all 25 million wood burning devices
is based on a total of 14 test runs using only one conventional and one
catalytic stove. Given that there is no
sizable body of high quality data, any projections of residential wood burning
air emission impacts tend to have low confidence levels.
The rate
of development of new wood heating equipment slowed considerably once the main
manufacturers completed their lines of low-emission EPA certified products and
the market demand for wood burning appliances slowed in the face of increased
popularity of gas hearths. Despite
these influences that tend to inhibit research investments, there have been
some developments.
When the
State of Oregon and subsequently the EPA enforced mandatory emission
regulations, it was generally believed that non-catalytic advanced appliances
could not meet the emission standard with firebox sizes exceeding about 2.5 cu.
ft. This was seen as a serious
limitation, particularly in the cold climates of most of Canada where the
conventional fireboxes in wide use were well in excess of 3 cu. ft. in
volume. It gave catalytic appliances an
initial edge in the market because they could use large fireboxes and still meet
the standard. However, since 1990,
several models of advanced technology stoves with fireboxes in excess of 3 cu.
ft. have achieved EPA certification.
Manufacturers have employed subtle improvements in firebox and air
supply design to achieve low emissions from larger fireboxes. This development has made the non-catalytic
advanced units more competitive with catalytic models and more suitable in a
wider range of applications, particularly whole house heating. Canadian manufacturers are well known for
their skill in developing effective advanced non-catalytic technologies and
perhaps as a result, non-cats dominate the Canadian market.
Driven by
more stringent state emission requirements, most notably in Washington State,
which has imposed a maximum particulate rate of 4.5 g/h, stove manufacturers
have managed to re-certify updated models of advanced technology units in the 2
to 3 g/h range, far lower than the original performance in the 4 to 7 g/h
range. Not only are fireboxes getting
bigger, but emission rates are falling as appliance designers further refine
the designs that first emerged in the mid-1980s.
The
regulation of particulate emissions from residential wood burning equipment in
the U.S. was a watershed event for the industry. Those appliance manufacturers with sufficient human and financial
resources turned those resources to the task of developing a new generation of
wood stoves at a time when there was scant evidence that they could succeed in
meeting the new emission limits. Those
manufacturers without the needed resources to develop the new products left the
industry in a rapid process of rationalization.
As the
new products reached the market in the late 1980s, stove buyers could, for the
first time, compare the various options based on reliable performance figures
instead of the exaggerated and unsubstantiated claims that had previously
characterized the marketing of wood stoves.
With more accurate performance information to work with, stove dealers
were better able to advise customers on the most appropriate appliance for
their needs.
Evaluating
the effectiveness of emission regulations in improving air quality through
direct measurements would be a costly and complex process. The impact on local air sheds of replacing conventional
wood heating equipment with certified low emission appliances has not been
measured reliably. Although one such
study was conducted in Crested Butte, Colorado, the finding of a 59 percent
reduction in fine particulates had a low confidence level because some
homeowners simply took out their wood stoves and did not replace them. Other factors such as temperature and wind
conditions during the test period, and the difficulty of distinguishing between
the various particulate emission sources also limit the accuracy of before and
after studies.
Given the
large performance differences between conventional and certified low emission
appliances that have been demonstrated in laboratory testing and confirmed in
real world in-situ testing, the most practical way to evaluate the benefit of
an emission regulation would be to track the uptake of advanced technologies by
the public through survey research methods, and project the airshed impacts
based on average emission rates for the various appliance categories. No studies of this type for jurisdictions in
the U.S. or British Columbia have been found in the literature.
Research
being conducted by the Advanced Combustion Technologies laboratory at NRCan for
Environment Canada will provide a better profile of the exhaust components of
both conventional and certified low emission appliances. The results of this work will permit more
accurate projections of organic compound emissions than have been possible to
date. As well, survey research being
done for Environment Canada will help to characterize the frequency at which
advanced technologies exist in Canadian houses, again helping to refine
projections of air emission impacts.
Both of these research efforts, while they aim to reveal the key
indicators of progress in emission reduction, should be considered the
preliminary steps in a larger project to fully characterize appliance
performance and usage patterns.
With the
exception of B.C. residents, Canadians interested in buying a wood stove or
fireplace insert can choose between a conventional model or one that is
certified as clean burning by EPA.
There are significant differences in both price and performance between
the two. The retailers interviewed for
this project reported that the price spread between conventional stoves and EPA
certified stoves is between $200 and $500.
In the low price range for a small stove that would heat a seasonal
cottage or a large room, a conventional unit can cost as little as $400,
whereas the lowest price EPA certified model would be around $600, although
most would be $900 or more. For larger
units capable of heating an entire small home, the conventional model would
cost between $600 and $800 and an EPA certified unit would be $1100 and
up.
With such
a large price spread, one might expect that the low emission units would be
hard to sell, but this is apparently not the case. There are two main reasons why EPA certified stoves account for
between 85 and 100 percent of sales in specialty retail stores and over half of
all sales in most market areas. First,
almost all certified stoves include features that buyers want and don't usually
find on conventional stoves. These
desirable features include glass doors with air wash systems, ash drawers,
integral shielding for close installation clearances, decorative plated trim
pieces and attractive styling. Each one
of these features adds to the selling price, but also adds to the perceived
value of the product, making it more attractive. The second reason given for strong sales of low emission stoves
is that they have been on the market for almost a decade and the general public
is beginning to see their advantages.
It is apparently not uncommon for a stove buyer to express the awareness
that an EPA stove will ultimately save money because its higher efficiency
translates into less wood purchased and burned. The idea of getting more heat for less wood with the new stoves
is "on the street" according to dealers. Even though comparative efficiency figures are not consistently
published by stove manufacturers, the better performance of a low emission
model is immediately apparent to a new user.
Retailers made a point of noting that, despite the fact that the stoves
are regulated on the basis of particulate emissions, it is the higher
efficiency and lower fuel costs, rather than concerns over air quality, that
influence the purchase decision.
Most of
the conventional technology wood heating appliances on the market are models
that have been in production for many years, and their designs have not changed
substantially since their introduction.
Virtually all conventional wood stoves are priced under $1,000. Some particularly inexpensive models degrade
rapidly when used for serious heating near the limit of their heat output
capability. It is clear that some
householders buy and replace these units every few years, reasoning that they
are so inexpensive that perhaps five years of use is acceptable.
Ever
since the EPA regulated wood stove emissions in 1988, and in particular, when
British Columbia established identical smoke limits in 1994, the expectation
has existed in the Canadian hearth products industry that in the near future
such regulations would be made mandatory across Canada. Interviews with key manufacturers of
conventional appliances revealed that there are two distinct strategies to deal
with the expected regulation of stove emissions. One strategy is to withdraw from the market when conventional
products are no longer permitted; one manufacturer clearly indicated that he
would do just that. The second, more
common strategy is to shift production to advanced technology units which some
manufacturers are already producing.
Several manufacturers are already prepared to make this shift whenever
an emissions regulation comes into effect in their main market area.
One
significant trend in the conventional technology category is the emergence and
surprising popularity of outdoor boilers, particularly in rural Manitoba and
Ontario. These units have the size,
shape and appearance of a metal-clad garden shed of the type used to store lawn
mowers and other equipment. The metal
shell encloses an atmospheric boiler fired with wood. Insulated piping is run under ground to the house where the hot
water is fed through a radiator in the supply plenum of an existing forced-air
furnace or sent directly to hydronic radiators throughout the house, before
being returned to the boiler for re-heating.
These boilers are usually of simple internal design, although at least
one manufacturer offers a catalyst as an optional upgrade. Purchasers are apparently motivated by the
idea that the perceived mess of wood heating is kept out of living areas and
the fact that the combustion unit is outdoors eliminates the worry of house
fire. Outdoor boilers, however, are an
expensive option, retailing for between $3,500 and $6,000, plus installation
which can drive the total price towards $10,000 in some cases. The units have potential advantages, such as
domestic hot water heating and the output to heat two or more small buildings
when used as a sort of mini district-heating plant. However, the units are commonly oversized for the actual load,
with the result that their main mode of operation is an off-cycle smolder.
Outdoor
boilers are a controversial product because during their on/off operational
cycle they frequently emit a large volume of dense smoke. Complaints about smoke from outdoor boilers
are widespread, prompting some municipalities in North Western and Eastern
Ontario to create bylaws banning the products from their jurisdictions, and in
one case, forcing the Ontario Ministry of Transport to issue a warning to an operator
because visibility for drivers on an adjacent highway was inadequate for safe
travel. While no reliable performance
data was found for outdoor boilers, most commentators assume that their
delivered efficiencies are low. The
problem of contaminated soil has also been reported when a structural or piping
failure led to the spillage of a large quantity of antifreeze into a
residential yard in Manitoba.
In those
areas where outdoor boilers are popular, they tend to be the source of most
wood smoke-related complaints. This
product category is not included in emission regulations established by the
U.S. or B.C. No data has been found to
quantify the use of outdoor boilers or their performance characteristics. However, since they have apparently gained a
significant market share in some regions and since there is some evidence to
suggest that they can produce significant smoke emission problems, further
research is warranted. In particular, a
study of emissions and efficiency performance would be helpful, as would a
survey to determine how many of these units are in use.
The
hearth industry, including trade associations, manufacturers and retailers,
strongly supports the enforcement of mandatory emission regulations for wood
stoves. Although there is some altruism
and good corporate citizenship involved in their support, most of the reasons
have to do with good business practice.
Here are some of the stated reasons why the industry supports emission
regulations:
·
Low
emission stoves work better. They
produce a more stable fire that is less likely to smolder and they provide a
more consistent and reliable overnight burn than conventional models.
·
People
find EPA certified stoves more satisfying to use because of glass air wash
systems and other features. Dealers
know that the more satisfied their customers are with their stove, the more
likely they will be to encourage their friends to buy.
·
Smoke
belching from chimneys gives wood heating a bad name. If all stoves were clean burning, dealers would be better able to
promote wood as an environmentally responsible way to heat houses.
·
Low
emission stoves are safer because they produce less combustible deposits in
chimneys; fewer chimney fires mean fewer insurance claims and a more positive
public profile for wood heating.
·
An
emission regulation would level the playing field. Retailers report that a customer can leave a specialty retail
store after hearing a sales presentation on the advantages of low emission
appliances and visit a building supply store that sells uncertified stoves and
hear exactly the opposite message, i.e. that EPA certification is a gimmick
that makes no difference and that specialty stores just sell fancy, over-priced
stoves. Some dealers claim there are also
public safety implications to this market dynamic; that is, the specialty store
tends to employ staff that have met the professional certification requirements
of the Wood Energy Technical Training Program (WETT), and these people pass on
safety messages during a sales presentation, whereas this is less likely to
occur in a building supply or general merchandiser. An emission regulation would give specialty stores a fairer
opportunity to make the sale and have the opportunity to pass on safety
information.
The most
recent review of the policies of provincial governments regarding the adoption
of emission regulations for wood burning appliances was in response to a
September 24, 1996 letter from the Hearth Products Association of Canada (HPAC)
to each provincial minister of energy and environment. The letter (see Appendix B) dealt with the
adoption of efficiency requirements for gas-fired hearth products as well as
the issue of wood burning emission regulations. The provincial ministers were informed that the industry, through
HPAC "would welcome new Canada-wide regulations on wood burning
appliances, the same as those currently in place in BC." The responses of the ministers was generally
positive, with some ministers clearly voicing support for action on wood stove
emissions and noting the importance of common standards across Canada. Other ministers expressed reservations about
the enforcement costs of additional regulations, yet indicated support for appliance
performance standards to be incorporated into safety test standards. There was a significant range in the
apparent familiarity of the ministries with the issue of wood burning
emissions; some have a high awareness level and others display little knowledge
of the issue. Some relevant excerpts
from the Ministers' responses are contained in Appendix C.
The
concerns expressed by some environment ministries regarding the administrative
costs of regulating wood burning emissions would be significantly diminished by
feedback from British Columbia on the experience with its 1994 regulation. The Air Resources Branch, the group within
the environment Ministry that took the lead in developing the regulation, has
had virtually no administration and enforcement costs since the regulation came
into effect on November 1,1994.
Although the regulation (B.C. Reg. 302/94, see Appendix D) prescribes
fines for non-compliance of up to $200,000, none have been levied so far and no
significant instances of non-compliance have been reported. The Ministry attributes the lack of
enforcement problems to the industry's general support for the regulation,
combined with market-driven willingness of hearth industry companies to report
instances of non-compliance that come to their attention. More exploration of the British Columbia
experience may be warranted in order to address concerns over enforcement
costs.
The
environmental impacts from the use of household equipment is most commonly
regulated indirectly through measures intended to reduce energy
consumption. The EnerGuide program
created public awareness of appliance efficiency through highly visible
labeling of the products' energy efficiency performance. Several provinces, notably B.C. and Ontario,
as well as the federal government, have enacted energy efficiency acts which
require minimum energy efficiency limits and test protocols to be incorporated
in product certification standards.
This approach is favoured because, after the consultations and
negotiations result in amendments to testing and certification standards, there
is no enforcement role required of the government departments that establish
the act requiring standardization of minimum efficiencies. Energy efficiency becomes simply another
requirement for product certification and acceptability in the market place.
The
regulation of the environmental impacts of wood burning equipment is
different. The EPA wood stove
regulation was and is unusual because it is the first North American case in
which a home appliance was regulated on the basis of its direct impact on the
environment, rather than indirectly through minimum efficiency
requirements. In the case of
woodburning equipment it is not just appropriate, but necessary, to regulate
particulate emissions rather than efficiency.
This is because the energy efficiency of a wood burning appliance can be
boosted simply by increasing heat transfer surface area and limiting combustion
air flow to the fire, just as the manufacturers of "airtights" did in
the 1970s. The technology required to
minimize smoke emissions, particularly at the relatively low burn rates needed
for home heating, is far more complex and difficult to perfect. EPA certified stoves do produce much lower
particulate emissions at low burn rates than conventional equipment is capable
of, and as a byproduct, total efficiency rises because of reduced chemical
losses in the form of smoke. Although
the EPA does not require average efficiency to be reported on appliance
certification labels, the Oregon Department of Environmental Quality did, and
their list of certified wood burning appliances showed that none had an
efficiency lower than 60 percent and that the average efficiency was about 70
percent. Therefore, there is no need to
regulate wood burning appliance efficiency because acceptable efficiency is a
byproduct of low emissions combustion.
Also, forcing manufacturers to compete with each other by engineering
their products to produce lower and lower flue gas temperatures (which is
technically easy to do) is not advisable because the result would be
operational problems such as combustion spillage and flue gas condensation in
chimneys.
In 1988
when the EPA established its regulation, its influence was felt immediately in
Canada. Canada's largest and most
successful wood stove manufacturers, whose export sales often exceeded domestic
sales, had been busy developing low emission products for several years and had
products ready for certification. The
companies with the most market influence abruptly stopped producing
conventional equipment and this sent a strong message throughout the Canadian
market that these companies staked their future on advanced technology
products. Canadian specialty retailers
enthusiastically embraced the new technologies.
When, in
the early 1990s, the B.C. government served notice that it would establish a
wood smoke regulation, and it was apparent that it would not simply adopt a
U.S. government regulation, the Canadian Standards Association technical
committee responsible for standard B415.1
Performance Testing of Solid Fuel Burning Stoves, Inserts and Low-Burn-Rate
Factory-Built Fireplaces13, rushed to form a consensus. Although the committee had been meeting
intermittently since 1984, the prospect of its standard being mandated caused
its efforts to become more focused. It
soon became clear that the B415 standard could not deviate from the EPA
regulation without causing massive disruption to the market. Even though there were (and are) industry
complaints about certain details of the EPA methodology, the fact is that it
functions with reasonable effectiveness and has become an integral component of
the North American hearth industry. The
industry members on the B415.1 committee argued forcefully that the standard
would have to mirror the EPA requirements precisely or every product would have
to be re-tested at great expense, and possibly re-engineered at even greater
expense. Eventually, CSA B415 was
published in a form such that EPA test results could be deemed to meet its
requirements and vice versa. The CSA
B415.1 standard was published in 1991, but had no effect until it was
referenced in legislation by British Columbia.
The B.C.
regulation under the Waste Management Act administered by the Ministry of
Environment makes reference to and accepts both CSA B415.1 and the EPA
requirements. As a practical outcome of
this approach, all emission certification testing is done in the United States
by agencies accredited by the EPA. Only
those Canadian manufacturers who export wood stoves to the U.S. build low
emission products and have them certified because the high costs of product
development and certification mean that access to the larger U.S. market is
needed to justify the investment. Part
of the EPA wood stove regulation stipulates that testing must be conducted by
agencies located in the continental U.S. and which are accredited by the
EPA. There is no mechanism by which a
Canadian manufacturer could have a product tested in Canada to the CSA B415.1
standard and have it accepted by EPA for access to the U.S. market. As a result, there has been virtually no
testing and certification done under the CSA B415 requirements.
Among
those interviewed for this project, there was strong support for a Canada-wide
regulation based on the B.C. approach.
Provincial governments foresee enforcement problems if they were to act
unilaterally and would expect some people to go to neighboring provinces to buy
conventional equipment. On the other
hand, a national regulation would be relatively easy to enforce because it
would bring Canada's regulations in line with the U.S., its largest trading
partner. The harmonization of wood
stove emission standards might also make possible a bi-lateral agreement on
reciprocal acceptance of low-emission certification between the two
countries. A reciprocal agreement of
this type would have the effect of lowering testing costs for Canadian
manufacturers and encouraging the development of Canadian testing facilities
and expertise.
As noted,
B415.1 addresses space heaters such as stoves, inserts and efficient
fireplaces. B415.2 covers central
heating systems like furnaces and boilers, and B415.3 is for the testing of
site-built and decorative fireplaces, and large factory-built fireplaces. Neither B415.2 or B415.3 are fully developed
and ready for use. Activity on the two
standards is unlikely in the absence of expressed government interest in
calling them up in a regulation.
The
actual amount of money that a given household spends on the winter supply of
wood can vary widely. Some people go
into the bush to cut the trees and process the firewood themselves. Others buy a large truck load in log lengths
which they then cut and split. Still
others buy split, seasoned firewood.
Each approach has costs, but some people spend more labour for their
winter fuel and some spend money. There
is also a wide range in the price of processed firewood, depending on whether
it is purchased in an urban or rural area.
In Table 4. a price of $175 per full cord (4 x 4 x 8 feet) or about $60
per "face cord" (4 x 8 feet x [about]16 inches) has been selected as
a common price for split wood in rural areas and small towns. Delivery costs can push the price towards
$200 per full cord in some regions.
Firewood can be twice this price in urban areas.
Table
4. Sample of Annual Heating Costs Using Various Fuels
Appliance Type |
Energy |
Fuel Energy |
Annual |
Appliance |
Annual |
|
Cost |
Content |
Heat Loss |
Efficiency |
Cost |
EPA
certified wood stove |
$175.00 |
30600 |
10000000 |
72 |
$794 |
Conventional
wood stove |
$175.00 |
30600 |
10000000 |
60 |
$953 |
Central
wood furnace |
$175.00 |
30600 |
10000000 |
50 |
$1,144 |
Pellet
stove - higher cost fuel |
$240.00 |
19800 |
10000000 |
70 |
$1,732 |
Pellet
stove - lower cost fuel |
$180.00 |
19800 |
10000000 |
70 |
$1,299 |
Oil
furnace, conventional |
$0.39 |
38.23 |
10000000 |
65 |
$1,553 |
Oil
furnace, high efficiency |
$0.39 |
38.23 |
10000000 |
80 |
$1,275 |
Electric
baseboard or furnace |
$0.08 |
3.6 |
10000000 |
95 |
$2,339 |
Ground
source heat pump |
$0.08 |
3.6 |
10000000 |
260 |
$855 |
Propane
mid-efficiency |
$0.42 |
25.3 |
10000000 |
80 |
$2,075 |
Natural
gas mid-efficiency |
$0.21 |
37.52 |
10000000 |
80 |
$700 |
Natural
gas condensing |
$0.21 |
37.52 |
10000000 |
93 |
$602 |
Notes:
1.
Source of base values and
calculations is the NRCan pamphlet: Comparing Heating Costs10
2. Fire wood price: The figure of $175 is an average price for a cord of
split wood in rural areas and small towns.
In urban areas the price can be twice this amount.
3. Price of pellets: Two price scenarios are provided to account for
variations in shipping costs and discounts for bulk purchases.
4. Fuel Energy Content: firewood - megajoules per full cord, pellets -
megajouls per ton, fuel oil - megajouls per litre, electricity - megajouls per
kilowatt hour, propane - megajouls per litre, natural gas - megajouls per cubic
metre.
5. House Heat Loss: the figure of 10000000 is a factor representing the
estimated annual heat loss of a 186/m2 (2000 sq.ft.) house built
since 1985 and located in a climate zone similar to that of Ottawa or Montreal.
At $175
per full cord, firewood is less costly to heat with than oil, propane, electric
resistance and pellets, but is more costly than using natural gas or a ground
source heat pump.
Note that
a household which upgraded to an EPA certified stove at 72 percent efficiency
from a conventional stove at 60 percent efficiency would save $159 in fuel
costs each year. Compared with a wood
furnace operating at 50 percent efficiency, the savings would be $350 each
year. These substantial annual savings
make upgrading to advanced technology an attractive investment.
The most
significant heating system purchase incentives are offered to Canadians by gas
utilities and, to a lesser extent, fuel oil distributors. Gas distributors have employed aggressive
marketing programs offering discounts and attractive payment terms for
homeowners who purchase gas fireplaces and other gas-fired appliances. The marketing is sophisticated, highly
seductive and, in the case of gas fireplaces, challenges the safety and
environmental appropriateness of wood burning fireplaces, so it should not be
surprising that people are buying more gas fireplaces and fewer wood burning
appliances than in the past. Here are
some direct quotes from gas company advertising:
·
"A natural gas flame does not produce
dangerous sparks. You don't have to
worry about long-burning embers or chimney embers because when the fire is out,
it's out."
·
"A natural gas fireplace burns cleaner
than a wood fireplace."
·
"And they're easy to use: there's no
kindling, no sparks, and no smoky rooms."11
·
"In fact, a typical customer is still
paying less for natural gas now than in 1984."12
The
Canadian public receives these messages in a more convincing form and with
greater frequently than messages suggesting that wood is a viable and
appropriate energy source. Observers of
the wood heating appliance market suggest there is evidence that the public is
turning against wood energy based on mixed messages regarding its environmental
impacts and a misunderstanding of how wood fuel consumption functions in
relation to greenhouse gas emissions.
The Green
Communities program, offered in B.C., Ontario and New Brunswick, was
largely a public information program
that helped people make environmentally sound purchase decisions. Partnerships were established with financial
services companies, notably Canada Trust, to provide loans with terms matched
to the energy cost savings resulting from purchases. Discussions were held regarding the payment-based-on-savings for
the purchase of low emission wood stoves, but the program was discontinued
before this initiative reached fruition.
No
incentive programs for the purchase of low emission wood stoves were found
during the research for this project.
It is
almost axiomatic to state that low income earners living in rural areas heat
with wood. Where incomes are low and
there is high unemployment, people are better able to spend time on fuel wood
acquisition and preparation than to spend money on processed firewood or
another processed fuel. Based on the
assumption (and it is an assumption) that low income rural families constitute
a significant portion of those who claim wood as their primary heating fuel,
does it follow then, that this group is more likely to purchase inexpensive
conventional stoves than to spend more on an EPA certified model? While there is no base of statistical
information that can answer this question with precision, the views of the wood
heat retailers interviewed for this project shed light on the matter.
Retailers
were asked to identify obstacles to the uptake of advanced technologies. Virtually all retailers (outside B.C.) first
mentioned the lack of an emission regulation as a key obstacle to the increased
adoption of advanced stoves. This
answer is not as rhetorical as it may first seem. The dealers point out that currently the shopper receives mixed
and confusing messages from various retailers.
Mass merchandisers, hardware stores and building supply outlets compete
in the marketplace primarily on the basis of lower price and tend not to carry
the more expensive wood burning models.
Their message to prospective customers tends to be: Why pay more?, which
is probably a compelling argument for someone on a limited income. Specialty retailers have a greater challenge
in informing their customers of the more complex efficiency and environmental
advantages of the more costly certified products. A mandatory emission regulation would have the effect of leveling
the informational playing field.
Ultimately
the purchase decision often comes down to price. While the incremental cost of low emission technology may add
only $100 to $200 to the retail price of the product, the additional features,
such as ash pan and glass door, that tend to accompany emission certification,
increase the price spread to about $500.
At the lowest price points, an EPA certified model can be about twice as
costly as a conventional unit. This is
a significant disincentive to adopt the technology. According to the retailer's responses, the most effective way to
influence the purchaser is to point out that fuel cost savings will compensate
for the higher purchase price within two or three heating seasons.
Some of
the retailers interviewed for this project mentioned that the customer's age
and education or access to information seemed to influence the purchase
decision. Older people who have heated
with wood for decades may resist adopting the new technologies and may replace
a worn out conventional stove with a new one of similar design. Their own experience would seem to reinforce
this approach; having heated with wood successfully for many years, why would
they need to spend more on advanced technologies? People who have not seen the new appliances operate or have not
talked to friends or family members who use and like them, are less likely to
spend the additional amount on advanced technology. Also, many people view wood stoves as simple devices and
associate them with practicality, economy, and even frugality. The new generation of advanced technology
stoves tend to be more decorative than traditional stoves. Large glass panels in doors, modern shapes
and bright plated trim may not be the image traditional wood burners feel
comfortable with.
People
living in rural and remote areas or small towns far from urban centres may shop
for and purchase a new wood stove, yet throughout the process never learn that
a new generation of appliances is available.
Many rural areas are not served by specialty wood stove and fireplace
retailers, the main outlets for EPA certified models, so advertising messages
promoting the advantages of the new technologies would not reach households
there. Dealers and distributors
interviewed for this project mentioned rural Newfoundland as a region where the
adoption of advanced technologies has been slow. One Ontario manufacturer noted that a significant proportion of
his entire production of conventional stoves goes to the Newfoundland market.
First
Nation communities located in rural and remote areas are also examples of this
dynamic. In many of these communities,
all building materials and durable household goods are shipped in from building
supply distributors located several hundred miles away. To a large extent, householders in these
communities have only the product offerings from a single company to choose
from, so they may never learn that other options are available. A related problem specific to remote
communities is the fact that advanced technology stoves tend to weigh more than
conventional models because of their complex internal features. The added weight can be a disincentive to
buy them because of the higher shipping costs involved.
Assuming
the estimate by industry commentators that somewhat more than half of total
sales are of advanced technology stoves is reasonably accurate, a significant
shift in the stove population is already underway. This means that the new technologies are well represented in the
market place, that they are proven under Canadian conditions, and that there is
a sufficient base of professional knowledge and skill in the industry in most
regions to support the public in their use of advanced wood burning
technologies.
Clearly,
the best mechanism by which to lower smoke emissions from residential wood
burning appliances is to replace conventional equipment with certified low
emission stoves. And the most effective
tool available to influence the uptake of the new technologies is a national
emission regulation requiring all stoves offered for sale to meet the
requirements of CSA B415/EPA standards.
Such an approach is recommended because, although provincial governments
express some interest in and support for regulating wood stove emissions, there
is no evidence that other provinces will take individual action as B.C. did in
1994. The willingness of the hearth
industry to support a regulation, and B.C.'s experience with high compliance
rates and low enforcement costs make such a regulatory initiative a positive
step in all respects. In fact, it is
difficult to identify a constituency that would oppose it, aside from those in
political circles who oppose any form of regulation on principle. While there is likely a traditionalist
segment of the population that would criticize the government for causing the
cost of wood stoves to rise, the evidence of higher quality and added value
cannot be ignored. Note that some
conventional stoves consist of little more than an empty steel box with a door. Given the minimum useful life span of a wood
stove of perhaps 10 years, over which time the incremental cost of advanced
technologies is spread, the cost impacts do not seem unreasonable. It is also possible that the price of the
least expensive advanced technology stove would come down after a regulation
were established as manufacturers seek to fill the low cost market niche
formerly filled by conventional stoves; that is, plain, unadorned styling and
lacking additional features such as ash pan and large glass door panel.
There is
a significant human factor involved in the rate of particulate emissions from a
given wood burning appliance. A
certified low emission stove could be operated to produce very high emissions
if the fuel is too wet, is not split to the correct size, is not loaded into
the stove correctly and if the combustion air control is closed too much. Conversely, a conventional appliance can be
operated to produce moderate emissions by a knowledgeable, conscientious person
using good fuel. The knowledge and
skills required to burn wood effectively are not intuitive; they must be
learned and practiced if improvement is to occur. Without input and support, users may never have their
misconceptions and improper techniques corrected. Public education initiatives aimed at reducing smoke emissions
could be effective by providing support to people who heat with wood,
regardless of the appliance they use. A
project of this type is being planned in Nova Scotia for the fall of 1997. It is a prototype partnership between the
hearth industry, the insurance industry, the regional lung association and at
least two agencies of the provincial government.
Wood is
unique among the main home energy sources in that its fuel supply sector, aside
from wood pellet manufacturers, is all but invisible and is not involved in the
trade associations or in discussions of policy. For all the other energy sources, the fuel supplier has regular
contact with the householder, if only in the form of a monthly bill. This regular contact creates opportunities
to pass on various messages, such as helpful seasonal tips commonly included in
electrical utility mailings. More
importantly, the fuel supply sector for electricity and fossil fuels is where
the financial strength of the industry lies.
In the case of residential wood energy, the largest companies in the
industry are the stove manufacturers, only a few of which employ more than 100
people. The rest of the industry is
made up of product distributors, wood stove and fireplace retailers, and
chimney sweeps, all small companies employing two to twenty people.
As a
result, the industry does not have the resources to communicate with the
Canadian public in the conventional ways that the oil, gas and electrical
industries do. The formation of
partnerships with allied industries and with agencies of government is perhaps
the only way the industry has of communicating non-commercial messages to the
public.
Those
Canadian families who heat their homes with wood receive very little support
for their efforts. It is rare for any
media, print or electronic, to mention wood heating in either a positive or
negative context. These homeowners are
not acknowledged for their use of a renewable energy source, nor are they
encouraged to improve their use of wood by using techniques that reduce smoke
and increase efficiency. A public
information initiative could help Canadians who heat with wood to understand
the techniques of responsible wood heating and take pride in their ability to
use them effectively.
With its
national mandate, the federal government has a key role in the reduction of
residential wood burning emissions. The
Minister of Environment could consult with provincial counterparts with a view
to reaching a consensus on a plan to institute a national emissions
regulation. If a consensus is
achieved—and there is some reason to believe this is possible—the Ministry
could then proceed with a regulatory initiative. This single step, which experience in B.C. suggests is low in
administrative overhead, yet highly productive, could set the stage for some
useful partnerships designed to educate the public about advanced technologies
and the importance of responsible wood heating practice.
If a
national emissions regulation is not seen as a viable initiative, the federal
government could support the adoption by individual provinces of standards on
emission limits. This approach is less
desirable because it is likely that some provinces, notably in the Prairie
region, would not participate and this would lead to a patchwork of
requirements across the country. The
wood energy industry has specifically expressed the importance of regulatory
harmony across all Canadian markets.
The federal government could assist the process by developing a
guideline as a model for use by the provinces.
Other
federal departments and related agencies have much to contribute to an
emissions reduction strategy based on a multi-stakeholder model. Natural Resources Canada could provide
technical, policy and communications support.
Health Canada might also contribute technical and communications support
based on its specialized perspective.
Canada Mortgage and Housing Corporation has an influence, through
research, publications and programs, on heating system selection and use in
Canada, and these may be influenced by and have an influence on a national
emissions reduction program.
Initially,
provincial governments could support an emission reduction strategy by
endorsing a federal initiative to establish a regulation requiring emission
testing and certification. Should a
federal regulation be established, each province could increase its impact by
publicizing its support for the use of low emission appliances. Including effective messages about wood
heating along with their other housing-related public information materials
would be just one way the provinces could influence current and prospective
users of wood fuel. To have valuable
input, governments do not need to get involved in quasi-commercial messages
like advice to upgrade to an advanced technology appliance — this can be left
to private sector partners.
Governments, however, are in the best position to offer general messages
designed to help the public use wood fuel responsibly. For example, governments can help people to
understand that a thick blue-gray plume of smoke from a chimney is highly
visible evidence of environmental irresponsibility. If governments and their partners seeded the formation of a
social consensus that visible wood smoke is bad and evidence of a lack of wood
burning skill, while offering tips on avoiding smoky fires, a gradual improvement
in wood heating practice could result.
If it is
determined that a federal emissions regulation would not be established,
provincial governments should be encouraged to adopt such regulations within
their jurisdictions. A federal
guideline would be of significant assistance to such initiatives.
The
hearth industry in Canada has an excellent record of effective collaboration
with government in support of the public's use of wood fuel. When, in the late 1970s, it became apparent
that the rapid increase in the use of wood was leading to an unacceptable
increase in house fires, the industry worked enthusiastically along side
regulatory agencies to put in place an installation code and the array of
safety test standards that now form the basis of the wood heat safety
components of building codes. In the
mid-1980s, when it was recognized that the industry had a key role in providing
the public with accurate and reliable advice and services, the industry
partnered with the federal and provincial governments to develop the Wood
Energy Technical Training (WETT) program.
When provincial governments decided that they would not regulate the
wood energy trade directly as has been done with other home heating fuels, the
industry agreed that it would establish a system of self-regulation by issuing
certificates of qualification based on WETT training. Today, the WETT program is a highly successful and respected
component of the wood heat safety regulatory system that is endorsed by all
provincial governments. The wood heat
industry is experienced in establishing and maintaining effective partnerships
and has had considerable success with such ventures.
One
example of an industry-driven mechanism to reduce emissions that has been used
successfully in the U.S. and B.C. is a program referred to as a stove
change-out. It is an information and
incentive program designed to help householders to upgrade their conventional
wood burning equipment. Participation by
manufacturers, distributors and retailers combine to create financial
incentives (discounts) on the price of advanced technology appliances. The discount can be contingent upon the
householder turning in their conventional appliance for destruction. This mechanism creates an excellent media
opportunity in which a huge pile of "old smokers" heads off to the
crusher, presumably to be recycled into new, low emission stoves. The participation of government in
change-out programs is critical in endorsing, not the commercial aspects of the
program, but the environmental advantages that accrue from upgrading.
Financial
institutions could be effective partners in a change-out program by providing
specialized loan programs based on projected fuel cost savings. The estimated annual savings of between $150
and $350 per year through the use of advanced technologies could be seen as an
offset to the cost of such loans. This
approach would give substantial meaning to the concept of resource conservation
through technology upgrade. The
participation of government with the hearth industry in promoting such a
program among financial institutions would be of significant assistance in
creating credibility and a sense of shared interest.
The
insurance industry has long been a partner of the hearth industry in helping
the public to heat their homes with wood more safely. Insurance companies play a key role by having contact with the
householder whenever there is the potential for a change in risk, such as the
installation of a new wood stove. This
contact is a good opportunity to remind people of the importance of a good
chimney and proper installation to ensure that their new advanced technology
appliance will function safely and to its potential. As part of a change-out program, participating insurance
companies could offer preferred rates to policy holders who use advanced stoves
and have had their installations inspected.
Provincial
and regional lung associations have been active in promoting better indoor and
outdoor air quality. An initiative
planned for the Fall of 1997 in Nova Scotia and New Brunswick is expected to
include the hearth industry, insurance industry, provincial governments and the
lung association as partners to educate the public on clean burning
techniques. If successful, this model
could be replicated in other regions.
6.1 Wood
is by far the most commonly used renewable energy source by Canadian householders. About one fifth of single family dwellings
are heated to some extent with wood.
Even those Canadians who report the use of wood as a supplementary fuel
tend to use it to provide a large part of their total heating needs.
6.2 The
aesthetics of the stove and the fire are more important to people now than in
the past. The more attractive stoves
and the ability to watch the fire as it burns has added to the desirability of
using wood as a fuel for space heating of living areas. Used this way, wood offers good prospects
for the displacement of fossil fuel use.
6.3 In
most regions outside large urban centres, it costs less to heat with firewood
purchased at market prices than with oil, propane, electric resistance and
pellets, but it is more costly than using natural gas or a ground source heat
pump (depending on electrical power rates).
6.4 Wood
stoves certified as low emission by the U.S. Environmental Protection Agency
operate at an approximate average of 5 grams per hour which is between one fifth
and one tenth of that emitted by conventional wood stoves.
6.5 The
smoke emissions from individual wood burning units is strongly influenced by
the quality of fuel used and the operating techniques employed by users. Public information programs could help
Canadians who heat with wood to understand the techniques of responsible wood
heating and take pride in their ability to use them effectively.
6.6 Certified
low-emission wood burning appliances operate at higher efficiencies than
conventional equipment, resulting in annual fuel cost savings of between $150
and $350. These substantial annual
savings make upgrading to advanced technology an attractive investment. These savings are acknowledged to be a
primary motivation in the decision by householders to upgrade their older
appliances.
6.7 Regulatory
action by the U.S., and subsequently by B.C. has had a significant effect on
the Canadian market; it is estimated that of all current wood stove sales,
somewhat more than half are of EPA certified low emission models.
6.8 The
relevant industry, as represented by the Hearth Products Association of Canada,
supports the adoption of a national regulatory initiative similar to that
adopted by British Columbia in 1994, which is in all functional respects the
same as the EPA requirements.
6.9 There
is reason to expect that a majority of provincial Ministers of Environment
would respond positively to a federal regulatory initiative.
6.10 The
B.C. experience suggests that the administration and enforcement costs to
support the regulation would be low.
6.11 Obstacles
to the uptake of advanced technology wood stoves include the absence of an
emission regulation, the higher cost of advanced stoves, resistance to change
on the part of purchasers, and a lack of information.
6.12 The
obstacles mentioned above can be minimized through the mechanism of a
Canada-wide emission regulation, combined with effective public information and
incentives for wood heat users to upgrade.
6.13 There
is inadequate information available on how Canadians use wood fuel to heat
their homes. More specific information
on the attitudes of the users, the types of appliances currently in use, and
the way they are used is needed to guide the development of effective public
education materials. Research into the
performance characteristics of the various appliance types is also needed. These two data sources—user profiles and
appliance characteristics— are required to develop projections of environmental
impacts and as a base line against which to measure progress in reducing
negative impacts.
7.1 The
federal Ministry of Environment should investigate the strategy of adopting an
emission regulation using the B.C. experience as a model. An alternative to this preferred approach
would be the development of a federal guideline which interested provinces
could use as a model for regulations within their jurisdictions.
7.2 Environment
Canada should support research designed to more accurately characterize the
emissions from the full range of wood burning equipment so that projections of
air shed impacts can be made with more precision and so that progress in
emissions abatement can be more accurately assessed.
7.3 Environment
Canada should support survey research designed to better characterize the
various patterns of wood heat usage, the results of which would permit more
accurate projections of environmental impacts.
This research data would also provide insights into how Canadians view
wood heating and use wood as a home heating fuel which can be used in the
development of effective public information materials.
7.4 Environment
Canada should consider supporting research into the full life-cycle cost of
wood burning equipment as a component of the complete analysis of wood as a
residential energy source.
7.5 Environment
Canada should help in the formation of and support for partnerships aimed at
developing and disseminating information in support of the public's
environmentally appropriate use of wood as a heating fuel. Likely partners include the hearth industry,
other departments or agencies of government at all levels, financial
institutions, the insurance industry and health organizations.
7.6 All
the identified partners should support and participate in programs such as
stove change-outs, clean burn demonstrations, and programs to distribute public
information.
1. United
Nations, Agenda 21, Chapter 9: Protection of the atmosphere, U.N.
General Assembly, New York (1992).
2. Hendrickson,
O.Q., Gulland, J.F.; Residential Wood Heating: the Forest, the Atmosphere and the Public Consciousness, delivered to the Air and Waste
Management Association annual meeting, 1993
3. Shipments
of Solid Fuel Burning Heating Products, Statistics Canada Catalogue 25-002,
Year-to-date Shipments, Quarter ending December 31 reports 1982 through 1996
4. Household
Facilities and Equipment, Catalogue 64-202, annual reports 1991 and 1996,
Statistics Canada
5. 1993
Survey of Household Energy Use, Natural Resources Canada, November, 1994
6. 1996
Retailer Survey; Hearth and Home Magazine, March 1997 issue, page 36,
Village West Publishing, 1997
7. New
Source Performance Standards, Title 40, Part 60, Sub-part AAA of the Code of
Federal Regulations, published by The Environmental Protection Agency, United
States Government
8. Jaasma,
D. R., Satterfield, G. T., Shelton, J. W., Stern, C. H.; Parametric Study of
Fireplace Particulate Matter and Carbon Monoxide Emissions
9. Jaasma,
D. R., McCrillis, R. C.; Comparability Between Various Field and Laboratory
Wood stove Emission Measurement Methods; delivered to the annual meeting of
the Air and Waste Management Association, 1991
10. Comparing
Heating Costs, Natural Resources Canada Catalogue No.:M91-2/43-1996E, 1996
11. Light
My Fire, brochure, Consumers Gas Company Store, September 1996
12. Customer
newsletter explaining a fuel price increase, Consumers Gas, February 1997
13. CAN/CSA
B415.1-92 Performance Testing of Solid-Fuel-Burning Stoves, Inserts and
Low-Burn-Rate Factory-Built Fireplaces, Canadian Standards Association,
1992