Heating With Wood: Why Wood Heat Is Renewable Energy

A leading wood-heat expert explains in epic detail why wood is an essential energy resource.
By John Gulland
March 2, 2010
Add to My MSN

EPA-certified woodstoves cut wood smoke by up to 90 percent compared with older, so-called “airtight” stoves.
PHOTO: ISTOCKPHOTO/MONTEGARI PHOTOGRAPHY


Content Tools

Related Content

The Year of Magical Walking

Cam enjoys a magical walk through a winter wonderland while cutting and hauling firewood.

5 Geothermal Homes, From the City to the Country (And In Between)

Geothermal heating and cooling systems rely on the earth’s constant underground temperature of 45 to...

A Better Way to Stack Firewood

A short lesson and video on stacking firewood in round piles

Does the Federal Government Provide Financial Assistance to Homeowners for Installing Renewable Energy?

Find out what types of federal tax incentives are available for homeowners who install renewable ene...

John Gulland’s involvement with wood burning began in 1974 when he built a woodstove for his own home. Since then he has gained professional experience in virtually every aspect of heating with wood, including product design and manufacture, retailing, standards development, policy and market analysis, laboratory research, professional training and writing. Most recently he helped launch The Woodpile, an advocacy project attached to the popular woodheat.org website. 

By any measure, wood is an important residential energy resource, especially outside large urban areas. More than 10 million U.S. households — a little less than 10 percent of the total — use wood as their main heating fuel or to supplement other heating fuels. More than 25 percent of Canadian households are heating with wood.

A drive through small towns and down country roads in forested regions confirms that fuelwood is a significant energy resource. The long rows of piled firewood standing in yards serve as proof. Every winter, the wood is cut from woodlots, and every spring it’s split and stacked to dry in the summer sun. In the fall it’s moved to the house and stacked again, and in winter it keeps families cozy warm. It’s a seasonal ritual, that has been recurring for generations.

Firewood for home heating is an indigenous, renewable energy resource that helps families stretch their household budgets and strengthen their local economies. And yet, an increasing number of vocal activists are clamouring to have wood burning banned from their communities because of air pollution, and even some environmentalists warn against the increased use of firewood, fearing negative impacts on our forests.

A balanced assessment of firewood for home heating is long overdue. This article explores how burning wood contributes to the prosperity of rural communities, to the health and well-being of their inhabitants, and to the environmental sustainability of our society. It also tackles the problems of wood-smoke pollution and forest resource impacts.

Smoke Emissions

Wood-smoke pollution is the most serious negative result of wood heating, so it’s best to deal with it first.

The problem of smoke pollution from residential wood burning has been debated since the resurgence of wood as a fuel after the oil crisis of the 1970s. Because it contains toxic chemicals and known carcinogens, wood smoke is unhealthy to breathe in high concentrations, and even in low concentrations can be harmful to children, the elderly and those with lung diseases or allergies. There are three aspects of wood smoke pollution that can be considered: nuisance smoke caused by a neighbor; airshed contamination caused when many households contribute too much smoke in a confined area, such as a river valley; and indoor air pollution caused when a wood burning appliance spills smoke into the house.

In the aftermath of the first oil crisis in the late 1970s, governments supported the public’s return to wood as a home-heating fuel. At the time, it was seen as one strategy to reduce dependence on expensive imported oil. However, a gradual policy shift has occurred since then. Positive statements about firewood’s status as a renewable energy source and its role in reducing net greenhouse-gas emissions are less common and more qualified in government documents than previously. To the extent that public officials deal at all with the issue of wood heating, the concern tends to be more with pollution abatement than with encouragement.

Statements by both government and non-governmental health agencies frequently include lengthy statements about the hazardous chemical constituents of wood smoke. They offer lists of compounds such as polycyclic aromatic hydrocarbons, dioxins, and furans and acrolein. The use of intimidating technical terms without offering contextual information makes these detailed statements quite beyond the ability of the average reader to interpret. For example, a comparison could be provided in the form of a list of chemicals emitted by a city bus or a backyard barbecue, which are similarly odious sounding. Government personnel insist that statements listing the chemicals found in wood smoke are simply intended to inform the public, but it might equally be said this communications tactic reveals an underlying intention to dissuade the public from using wood fuel, especially considering that no other energy source receives this kind of treatment in public information.

It is not the intention here to minimize the environmental impacts of wood heating or attempt to deflect concerns by highlighting pollution from other energy sources. But a balanced assessment of benefits and risks is called for when any energy source is evaluated or compared to other sources, especially by government agencies. Too often, those who have concerns about the wisdom of wood heating fail to understand or communicate that all energy sources, including renewables, such as wind and solar, have impacts on the environment. To single out one energy source for condemnation without providing supporting evidence or contextual information is unhelpful and unlikely to sway a justifiably skeptical public.

The problem of wood smoke from residential heating is serious in some places and under some conditions, and it is important that the public understands the risks and the ways to minimize them. The three dimensions of wood smoke pollution — airshed contamination, nuisance neighbors, and indoor air pollution — should be addressed through public information and, where necessary, regulation. To be successful in changing minds and behaviors, any government action should be developed in full recognition that people who heat with wood tend to be skeptical of experts or governments meddling with their personal wood heating practices.

Advanced Wood Burners Cut the Smoke

The new wood-burning technology found in Environmental Protection Agency (EPA) certified stoves goes a long way toward solving all three wood smoke problems: airshed contamination, nuisance wood smoke and indoor air pollution. These advanced stoves, inserts, fireplaces and furnaces cut wood smoke by up to 90 percent compared to older so-called “airtight” stoves, and also spill less smoke into the indoor air, because fires don’t tend to smoulder in them, the condition that most contributes to smoky indoor air.

Smoke emissions from older conventional woodstoves average at least 25 grams per hour (g/h) of operation, while the emissions from older wood-fired outdoor boilers range from 50 g/h to well over 100 g/h. In contrast, the EPA regulation limits emissions of certified woodstoves to no more than 7.5 g/h. However, since the regulation was first established in 1988, the average emissions of certified stoves have declined steadily due to advances in technology and competition among manufacturers. Today, most current wood-stove models emit only 2 to 4 g/h.

Although the EPA emissions limits are stated as solid particles (particulates) collected on filters, other detailed testing has shown that the emission of the scary-sounding polycyclic aromatic hydrocarbons such as fluorene and benzo (a) pyrene, as well as volatile organic compounds such as benzene and xylene, are all far lower in the exhaust from advanced wood heating equipment than from old-style wood burners.

Despite what some anti-wood heating activists have claimed, the technology is effective in reducing pollution. The reduction in smoke emissions has been a significant technological breakthrough in wood burning and is noticeable at the top of the chimney where no visible smoke is seen.

Advanced Equipment Is More Efficient, Too

Just as noticeable to users, however, is the increase in efficiency that results from burning (and not wasting) the energy-rich smoke. Conventional woodstoves range in efficiency from about 35 percent for a cast-iron box stove or furnace to as much as 55 percent for a 1970s era “airtight.” Most older outdoor boilers are less than 50 percent efficient. In contrast, EPA certified woodstoves average around 70 percent — and none are less than 60 percent efficient. The new breed of emissions-certified outdoor boilers also is much more efficient.

The difference in efficiency between conventional wood-burning equipment and the advanced low-emission models is so significant that users can immediately see the difference when they upgrade and begin using a new stove. The reduction in fuelwood consumption by (up to one-third) is significant for each household that uses the new technology, but it also has the potential to increase the number of houses that can be heated based on the sustainable harvesting of a given area of forested land. Another significant factor that reduces a wood-heated household’s impact on the forest resource is the lower heat energy requirements of modern housing. Together, the increase in wood-burning-appliance efficiency and improvements in housing energy conservation can roughly double the number of dwellings that can be heated by the yield from a given woodlot compared to just 25 years ago.

Community-wide smoke problems are uncommon in areas where level topography prevents the severity of winter temperature inversions that trap smoke close to the ground. While community-level smoke problems are relatively rare, nuisance smoke caused by thoughtless neighbors has been identified as a problem in dozens of towns. One technology in particular has been the focus of many complaints. Outdoor wood-fired boilers (OWB), which look like metal garden sheds and send hot water to one or more buildings through buried pipes, have become notorious for the dense smoke they produce. Small towns have enacted bylaws restricting the installation of outdoor boilers by either banning them from residential areas or placing limits on their proximity to property lines.

The source of the problem is that central-heating furnaces and boilers, including OWBs, were exempt from the original EPA emission rules back in 1988 on the basis that there were too few of them to bother regulating. Well, that was then. Now, OWBs are popular. As a result, a new smoke emissions test for OWBs has been approved, and certified models are now on the market. On paper, the new breed of OWBs look much better than the older, smokier versions. Time will tell if they are clean burning enough to satisfy regulators and reduce public complaints.

Wood Energy Use Cuts Greenhouse Gas Emissions

Wood is considered a renewable fuel, which is obvious considering new trees grow to replace those harvested. What may not be quite so obvious, however, is that heating with wood does not contribute to climate change the way fossil fuel use does. When oil, gas and coal are burned, the carbon they contain (which was absorbed from the atmosphere by plants millions of years ago) is oxidized to carbon dioxide (CO2), the main greenhouse gas (GHG). The combustion of fossil fuels releases ancient carbon, thereby increasing the atmospheric concentration of CO2.

The Forest Carbon Cycle

Wood is about half carbon by weight but its use as a fuel is almost carbon-dioxide neutral because trees absorb CO2 as they grow. When trees mature, die and fall in the forest, and decompose there, the same amount of CO2 is emitted as would be released if they were burned for heat. In other words, decomposition (rot) is a slow form of oxidation whereas combustion in a woodstove or furnace is fast oxidation, with heat as a by-product. When considered over the normal forest regeneration period of 50 to 100 years, heating with wood can be considered almost CO2 neutral. In heating our houses with wood, we are simply tapping into the natural carbon cycle in which CO2 flows from the atmosphere to the forest and back. Therefore, when wood is burned as a substitute energy source for fossil fuels, a net reduction in GHG emissions results.

Using Wood Fuel to Reduce Greenhouse Gas Emissions

The actual reduction in household CO2 emissions by using wood instead of fossil fuels cannot easily be estimated with precision. However, a rough estimate can be made in the case of wood substituting for the use of fuel oil. The emission factor for fuel oil is 22.4 pounds of CO2 per gallon of fuel oil burned. So, for every standard 200 gallon tank of fuel oil burned, 4,480 pounds, or two tons of CO2, is released.

If you heat with natural gas or propane, you can work out the reduction in greenhouse gas emissions for your household using these emission factors: natural gas — 121 pounds CO2 per 1,000 cubic feet; propane — 12.7 pounds CO2 per gallon.

Source: Climate Crisis: How We Calculate Your Score

The combustion of wood fuel is not completely CO2 neutral considering there are fossil-fuel inputs to firewood production (chainsaws, splitters, trucks), and the combustion of wood releases some methane, which is a greenhouse gas but which is not absorbed by trees as they grow. One sample calculation of these CO2-equivalent emissions found that the fossil-fuel inputs reduced CO2 neutrality by 6 percent and methane emissions reduced it by 15.2 percent, making efficient wood combustion 78.8 percent carbon neutral. To account for fossil fuel inputs and other greenhouse-gas emissions, let’s be generous and assume that wood is only about 75 percent CO2 neutral.

The reduction in CO2 emissions when wood displaces a 200 gallon tank of oil is 4,480 x 75 percent equals 3,360 pounds. That would mean if the owners of an average house located in the Northeast United States (who burn two tanks of fuel oil each winter for heating), would switch 100 percent to wood heating, they could cut their CO2 emissions by at least 3.36 tons. Looked at another way, as a rough average, each full cord of wood burned instead of fuel oil results in one less ton of CO2 released into the atmosphere.

Making big reductions in a household’s carbon footprints is not easy, and usually involves major changes in lifestyle, such as using public transport instead of a car, eating less meat, using a clothesline instead of a dryer and so on. Switching fully to wood heating is also a big lifestyle change, but the rewards are generous. Trading some labor and spare time for deep engagement in one of life’s necessities is satisfying, and being completely in control of providing secure heating for one’s family is fulfilling as few lifestyle changes can be.


Energy Return on Energy Invested

Looking at the Energy Cost of Energy

Economists focus on the financial cost of energy, but the energy costs of energy can provide better insights into environmental costs and the underlying reasons for the financial cost. For this reason, the energy return on energy invested (EROEI) should be included in any appraisal of the quality, impacts and appropriateness of various energy sources. Here is a sample EROEI analysis for fuelwood compared to other energy sources. Note that the value of labor is not included in the calculation.

Assumptions:

  • The energy cost of labor is not included
  • Hardwood fuel: 28 million btu/cord
  • 1 gallon of gasoline: 125,000 btu
  • Average round trip for fuel delivery: 60 miles
  • Fuel consumption of pickup truck: 15 mpg

Calculation:

  • Two round trips per cord: 8 gallons
  • Chain saw fuel per cord: 0.5 gallon
  • Log splitter fuel per cord: 1 gallon
  • Energy input: 9.5 gallons x 125,000 = 1,188,000 btu
  • Therefore: 28 million / 1,188,000 = EROEI of 24:1

An EROEI of 24:1 may not be accurate in all areas for fuelwood, but it is close for rural areas. Harvesting from their own woodlot, some people probably produce firewood at an EROEI of 30 to 40:1. If, in the example above, the fuel was softwood like spruce or poplar, the EROEI would be much lower, around 14:1 because of the lower energy content of the fuel.

For comparison, back in the heydays of oil, when discoveries were peaking and consumption was just ramping up, one barrel invested would yield 100 barrels for sale, a cheap energy bonanza. Today, gushers are a thing of the past, most of the biggest oil fields are in decline and the “new” oil fields are tiny and found under oceans. The EROEI of oil and gas has now fallen to 10:1 to 20:1, depending on age, type and location of the field. So-called unconventional oil such as the bitumen extracted from the Canadian tar sands has an EROEI of 1.5:1 to 4:1, depending on how the calculation is done and who does the calculation.

Charles Hall, a professor in the Faculty of Environmental and Forest Biology at the State University of New York, is one of the foremost EROEI researchers. His latest analysis suggests that the EROEI of firewood is around 30:1. You can read the complete report, published in American Scientist Volume 97 #3, May-June 2009.

Wood, in the form of natural firewood, compares favorably with other fuels regarding the amount of net energy realized after processing and transportation. This bodes well for a degree of price stability for fuelwood in the future. Price stability is not likely for the fossil fuels because as the easily accessible deposits are consumed the EROEI rises dramatically, as does the retail price.


Sustainable Forestry

What If Everyone Heated With Wood?

Critics of wood heating like to say that if everyone decided to heat with wood, the air would be polluted and every forest in the country would be mowed down to produce firewood. Maybe, but the whole idea is pretty silly, considering that wood is a lousy urban energy source and is best used locally. Even the most ardent defenders of wood heating would never promote it as a universal energy source.

Large parts of the country are relatively thinly populated and have highly productive forests. These are the regions where wood heating makes sense. Foresters have said that wood heating could easily double or more in many regions without putting undue stress on the forest resource. Our forests need to be managed sustainably, but the methods are well known and can be summarized easily: Uneven-aged selective harvesting, thinning of dense stands and removal of poorer quality trees, while leaving seed trees of all present species and ages, and some standing dead trees to provide wildlife habitat.

Many woodlots in farm country can offer a striking model of sustainable forestry. The careful work by generations of farmers and other woodlot owners, visible in healthy, productive woodlots that have provided generations of owners with their heating fuel and other products, provides the stewardship model others can follow.

And while many woodlot owners understand and practice sustainable forest management, others exploit the resource for short-term profit. Unfortunately, some farmers have maximized short-term profit by clear cutting their woodlots and converting the land to cash-crop production. Some companies and individuals have made a practice of buying large parcels of unused forest land, stripping them of all the commercial trees and then reselling the depleted parcels. These profiteers meet the definition of woodlot owners, but they do not maintain ties to the lands they buy and sell.

It has long been said that a healthy, well-managed woodlot can yield half a cord of wood per acre per year forever — one full cord being a pile 8-feet long, 4-feet wide and 4-feet high — and that a 10-acre woodlot could sustainably produce enough firewood each year to heat a house. Although that guideline is old and not precise, it still holds true. In fact, it takes a lot less than five cords of wood, and therefore less than a 10-acre woodlot, to heat a new energy-efficient house using a modern woodstove. There is some evidence that carefully designed and built houses can be heated with as little as 11/2 cords of firewood.

Despite its considerable advantages, fuelwood is not a good solution to the problems of high home-heating costs and global warming for all households. Fuelwood is not a suitable energy source in all locations, such as densely populated urban areas, because its air emissions tend to be higher than other options, and the air is already burdened with pollution from industry and transportation. A winter’s supply of wood takes up a lot of space, and the price of firewood in urban areas is normally too high to achieve savings. Successful heating with wood also requires a level of physical fitness and the learning of a special set of skills. Clearly, wood heating is not for everyone.


Wood Energy Economics and Heating Security

Comparing Firewood to Conventional Heating Fuels

Fuelwood is unlike any other mainstream heating fuel, in that users are engaged physically and mentally in its consumption, and for many, in its production as well. Users of oil, gas and electric heating are typically involved only in paying energy bills and adjusting thermostats. As a result, any cost comparison of wood with other fuels is likely to be inaccurate, if not misleading, because it cannot account for either the labor costs or the intangible benefits of wood heating.

Householders considering a switch to wood heating would find it useful to know how much money they might save compared to the use of conventional fuels, in the same way that other major purchases are evaluated. The problem with this approach is that the cost-benefit analysis of wood heating is not easily reduced to a simple matter of money. Considering the rising prices of conventional fuels, it is probably accurate to say that households located outside major urban centres where there is significant forest cover could save money using firewood on a strictly heat-energy-per-dollar basis. But how can the other less tangible costs be evaluated? These costs might include:

  • The space required to store a winter’s supply of firewood outside the house and space inside the house for a few day’s supply
  • The physical strength and stamina required to split, move and stack firewood
  • The time consumed in managing the fuel supply, tending the fire and dealing with regular maintenance tasks such as ash removal
  • The impact of the inevitable “mess” of wood chips, bark and wood ash on the time consumed by household cleaning

The intangible benefits are equally difficult to evaluate in monetary terms.

  • The satisfaction one feels in having mastered home heating largely by personal labor and ingenuity
  • The sense of security both in terms of energy-price stability and in the ability to remain comfortable in the home during electrical-power interruptions
  • The beauty and ambience created by a fire burning behind clear glass doors
  • The special kind of warmth given off by a woodstove located in the main living area (this may be debatable in terms of physics, but it is mentioned by most users of wood fuel as an important benefit)

Several websites offer fuel-cost comparison methods. The calculations are fairly complex, accounting for local fuel pricing, housing type, climate zone, fuel type, appliance type and efficiency. However, a good indication of the imprecision of these calculation methods is that only whole-house heating to an even temperature throughout can be considered. This type of calculation cannot accommodate a woodstove used as a partial or complete heating replacement for a central furnace using conventional fuel. Compared to central heating, the use of a woodstove for space heating, especially if it is located in the main living area, can mean a reduction in heat energy needed by up to 25 percent, regardless of the cost of either fuel.

How Wood Heating Strengthens the Local Economy

Let’s look at some real-world examples of how people save money by heating with wood. Some families buy their firewood already split so their work only involves stacking it to dry. They might spend $250 for each cord (4 feet by 4 feet by 8 feet), the equivalent of almost $440 in fuel oil at $2.75 a gallon. That family’s savings wouldn’t be large, but they would gain all the tangible and intangible benefits of wood heating.

Someone working in his woodlot, harvesting trees and processing them into firewood can save most of the cost of heating using other methods. For him, the cost of a winter’s firewood is two week’s work and a few gallons of gas for the saw, splitter and truck. Harvesting and processing the household’s heating fuel can save $2,000 or $3,000 every year.

What if 20 households in a small town decided to save money by heating with wood instead of oil? Each of the 20 households would have a few hundred to a few thousands of dollars more to spend around town that year. Every dollar saved through wood heating is another potential dollar of spending that strengthens the local economy.

Rural areas tend to have large “trade deficits” on consumer goods and most commodities. Their “exports” are usually based on natural resources such as mining, agricultural and forest products. Revenue from external sources is commonly in the form of tourism and recreation expenditures by non-residents. Overall, as population, industry and political decision-making concentrates in large cities, rural areas have not fared well economically.

A household that produces its own fuelwood supply saves $2,000 or more each year, an amount that can be used to reduce expenses in a household of marginal income, or that can be spent on other goods and services such as home improvements. This household trades its own labor for big savings in household operating expenses.

A woodlot owner who produces and sells firewood provides employment and income to the area. If that same producer practices effective management, the quality and value of the woodlot are enhanced at the same time. When a local household buys its winter fuel supply from a neighbor, the transaction has a multiplying effect by keeping the money circulating within the community, increasing local incomes and job creation.

Local economic activity, including jobs and incomes, is increased through the use of fuelwood as a substitute for fuels purchased from outside the community. In a time of uncertainty about the future price and security of conventional energy supplies, fuelwood provides some price stability for residents of rural areas, as well as a sense of security because, if necessary, each household could produce its own fuel supply with a relatively small cash outlay.


The Forest as an Energy Resource

Firewood from Public Land

The fuelwood market has two general sources of raw logs. The first is as a by-product of large-scale logging operations on public land. The second is logs cut from private woodlots. These two sources also tend to create two different business models for firewood wholesalers and retailers.

In the first case, commercial firewood producers buy low-quality cull logs (center-rotten or crooked) from forest products companies logging public lands. These are typically the large-scale firewood producers with yards containing hundreds of cords of split firewood. Most use processors that cut the logs to firewood length and split it in one operation. These producers normally do not engage in logging, but rather receive truck loads of cull logs from harvesting operations.

In most jurisdictions, the logging of publically-owned land is regulated to provide fair access to timber, and to ensure that harvesting is done sustainably and with as little damage to the site as possible. While the system is imperfect and there continues to be debate about commercial logging and sustainability, most of the cull logs diverted to firewood production from public-land logging can be considered to have been harvested sustainably.

Firewood From Private Woodlots

Private woodlots are the other main source of logs for fuelwood. Logging is sometimes contracted out, but is also commonly done by the land owner as part of annual or periodic work to extract income from the woodlot. For many farmers and other woodlot owners, the income from relatively small woodlots of less than 50 acres can produce significant annual income from the sustainable harvesting of saw logs, veneer, pulp and fuelwood. Case studies of several woodlots have shown that annual income from just the fuelwood component can range from as little as $25 to more than $200 per acre.

Farmers and other small-scale woodlot owners have little trouble finding willing buyers for the fuelwood they produce. Most sales are to repeat customers, and expansion of sales is often by word of mouth or small ads in local newspapers.


Firewood as an Energy Commodity

Learning to Buy Good Firewood

The firewood market is almost entirely unregulated, in the sense that there are no product quality or price controls in place. In fact, new converts to wood heating often find buying firewood an intimidating and frustrating experience. There are several reasons for this.

  • The buyer who has no experience with tree species and firewood quality issues is unable to judge the price-quality relationship and so feels vulnerable to the dealer.
  • The buying experience is unlike most other retail environments, often taking place in a dusty yard with trucks and heavy equipment to dodge.
  • New users sometimes make the mistake of ordering firewood by phone without seeing it first and are disappointed with what they receive.
  • Most new users have been warned about the problems of burning wet or green firewood, and yet lack knowledge of how to judge moisture content and have no basis for trusting the word of the seller.
  • The criteria for judging firewood quality and price can be learned only by experience; no amount of research or advice can create an instant expert. Some of these criteria include tree species based on wood density, piece size, moisture content, and the units the fuel is sold in; i.e., full cord, face cord, truck load and volume measures such as cubic feet, yards or meters.

For every household starting out to heat with wood, the fuel purchasing process is like a right of passage, with uncertainty at first and the gradual building of confidence.

The Traditions of Fuelwood Use

Wood is humanity’s original heating fuel. Rarely acknowledged, however, is that its dominance was only displaced relatively recently. Although coal became available in urban areas and to the more affluent families living close to supply routes by the mid-20th century, in much of rural North America wood was virtually the only practical heating fuel option until after the Second World War.

Until the incentive for technological advancement was provided by EPA regulations in the late 1980s, wood-burning technology was simple and ineffective in producing complete combustion. Most wood-burning devices were little more than empty steel or cast-iron boxes in which to build a fire. Until the 1970s, gaskets on loading doors were rare, meaning that a stove or furnace might not provide enough control to hold a fire overnight.

Before the advent of small chain saws, trees were felled and logs were bucked up with hand saws, and splitting was done with axes. The amount of labor involved in producing enough fuel for a large, leaky old farmhouse was enormous. A typical farmhouse had a wood furnace, or one or more heating stoves, as well as a cook stove, none of which would have exceeded 50 percent efficiency. Each household would have had to produce 10 or more full cords of firewood.

The old cast-iron stoves and furnaces burned inefficiently, sending smoky exhaust through long flue-pipe assemblies to masonry chimneys that were commonly supported by wood structures. Frequent cleaning of flue pipes and chimneys was needed if chimney fires were to be avoided. But chimney fires are inevitable when simple technology is matched with user practices that produce long smouldering fires. This sense that wood heating is inherently hazardous remains with many people even today. A small-town fire chief speaking at a public meeting some years ago said: “It is not a question of if you will have a chimney fire, it is a question of when.” The fire chief’s advice is out of date now that advanced wood burners can burn the smoke and reduce the build up of creosote in chimneys.

Through most of our history, the use of wood fuel gave its users a degree of security and independence, even though staying warm in winter entailed some risk and a large amount of household labor.

The Appeal of Wood Heating Falls and Rises Again — Twice

After the Second World War the use of fuelwood for home heating declined rapidly as fuel oil and natural gas became convenient and inexpensive. For many people, wood heating was viewed as passé and associated with rural poverty and hardship. During the period of the 1950s through the 1970s, decorative wood-burning fireplaces were installed in a large proportion of new single family dwellings, especially in cities and suburbs. In the minds of most people, wood had slipped from consciousness as a heating fuel to become a fuel for ambiance and recreational use. This transition may partly explain why wood tends not to be viewed by big-city dwellers as a significant part of the home-energy landscape, but rather as a marginal option.

The energy crisis of the 1970s was a watershed event for wood heating in North America. Not only did the price of oil spike upwards with unprecedented suddenness, but the resulting high interest rates and recession of the early 1980s put additional pressure on household budgets. For many families, switching to wood heating became the single response to a number of related problems: the high cost of heating, insecurity about energy supply, and a defiant response to the economic pain that the OPEC oil cartel had inflicted on North Americans. The woodstove became a symbol of the resourcefulness and ingenuity in tens of thousands of households.

The rush back to wood heating after decades of decline led to problems. Having lost the family and cultural memory of the risk of house fires and the way to prevent them, and there being virtually no recognized safety rules and fewer enforced regulations, thousands of new users lost their houses to fire caused by hazardous installations. In just a few years, wood heating became one of the leading causes of residential structural fires. Governments at all levels, the insurance industry and the wood-heating industry worked together throughout the 1980s to develop safety standards and professional training programs.

By the mid-1980s, the price of oil and other energy commodities had settled back to manageable levels and the economy recovered. Gradually, wood heating lost its appeal for a portion of the households that had adopted it. By the early 1990s, oil and gas were again cheap relative to other consumer goods, and the gas fireplace had been improved to the extent than tens of thousands of them were sold to replace the trusty woodstove that had been installed 15 years earlier. With the economy booming and people working longer hours, convenience trumped energy self-reliance for many.

The year 1998 was notable for two events: First was the infamous ice storm in the Northeast United States and eastern Canada, which once again elevated the woodstove (along with the portable electric generator) to technological hero status. Wood-stove dealers reported a flood of new customers in the fall of ’98, people who vowed they would never again be vulnerable to the frailties of the electrical grid.

The second notable event of 1998 was the bottoming out of oil prices at around $10 for a barrel of crude. Ironically, an article titled “The End of Cheap Oil” appeared in Scientific American the same year. Authors Colin Campbell and Jean Laherrère accurately foretold the future of energy prices, predicting that the peak of oil production was not too many years away and that thereafter the price of oil would rise steadily, never to fall again. Since then, the price of a barrel of crude oil has risen after this first widely read prediction of the bleak future for world oil production.

And once again, as the prices of energy commodities rise along with fears about security of supply, homeowners turn to fuelwood in increasing numbers.

Fuelwood Use in the 21st Century

Compared to wood burning in the first half of the last century — the backbreaking work to produce fuel, the crude stoves and furnaces, and dangerous chimneys — heating with wood today is dramatically different and better in every way. The efficiency of the average woodstove has roughly doubled to about 70 percent. Advanced stoves don’t produce dense plumes of blue-gray smoke. Chimney technology and safety have improved. Recognized standards for virtually every appliance type and component have been developed and adopted into building code legislation. National training and certification programs for wood-heating salespeople, installers, chimney sweeps, and municipal and insurance inspectors have been established. There are now clear (if complicated) safety rules and trained professionals to help householders comply with them. There are more and better public-information materials available, produced by both government and industry groups.

Aside from improved safety and performance, modern woodstoves, which are by far the most popular type of wood-burning device, used by about 70 percent of wood-heated households, have become more aesthetically pleasing. Stoves are now available in enamel finishes, and both traditional and modern designs. No longer dusty black boxes, the new stoves can look at home in any well-appointed living or family room. And a good selection of EPA-certified factory-built fireplaces is available for those who like a built-in appliance.

Less obvious, perhaps, is the impact of two technological breakthroughs that have transformed wood heating since the mid-1980s: ceramic glass doors and glass air wash systems. Until ceramic glass was introduced, the only option was tempered glass which couldn’t tolerate the extreme temperatures developed inside modern woodstoves. A glass door that threatens to shatter at any moment could never be successfully used in stoves. The ceramic glass now used is not damaged by heat and is tough enough to stand up to the rigors of wood heating. Glass door breakage is now rare.

Glass air wash was introduced at around the same time as ceramic glass appeared. The system involves directing the primary air for combustion through a narrow strip above and behind the glass panel. Being cooler and therefore less dense than the combustion gases, the air falls in a curtain between the glass and the fire, keeping soot and creosote tars from collecting on the glass. The majority of new woodstoves have these ceramic glass panels that stay clear for days, and for the best systems, weeks of continuous use. Only in the past 20 years has it been possible to view a beautiful wood fire that efficiently heats a home. This is a true breakthrough that has changed the character of wood heating forever.

The Household Energy Budget

The extent to which fuelwood use affects the household budget depends on a number of factors, such as how the fuel is used and to what extent it is processed by the user.

Firewood is used in three distinct ways, each having a different impact on the household budget. First, firewood can be burned in a decorative fireplace which does not contribute significantly to home heating because of low efficiency. In the case of conventional fireplace use, the cost of firewood can be considered an entertainment expense, providing no tangible benefit to the household budget.

The largest segment of fuelwood use is to supplement other heating fuels. Supplementary use may take the form of part-time heating or for the heating of a section of the house, such as a basement family room or an addition to the house. The impact of supplementary wood heating on the household budget can range from inconsequential if the use is casual and infrequent to substantial if wood provides most of the heat for the house. It is worth noting that the practices of the insurance industry tend to cause a distortion in the statistics on primary and supplementary use of wood. Families that heat primarily with wood have been influenced by experience with the insurance industry to say that wood is a supplementary heating fuel because many insurance companies either refuse coverage or apply large surcharges to householders who claim to heat primarily with wood.

The third form of firewood use is primary heating, a practice that is most likely to occur in rural areas, and is the type of use that is most likely to have the biggest positive impact on household budgets. Considering that fossil-fuel inputs to firewood are low, a household that is willing to invest some labor can save thousands of dollars each year by heating primarily with wood. There are few other examples of “consumer choices” that can reduce basic living expenses to that extent.


The Personal, Family and Community Dimensions of Wood Energy

Personal Achievement and Satisfaction

There are few sources of documentation and analysis of the non-technical aspects of wood heat, and yet most people who heat with wood seem to hold strong feelings about their practice, even though these are sometimes difficult to articulate. A doctoral thesis by Eastern Ontario resident Wendy Milne provides more and better insights into the social dimensions of wood heating than any other document reviewed. The other primary source is quotations from correspondence posted on the woodheat.org website.

The production of fuel for heating the family home during cold winters is an accomplishment with significant meaning for the people who do the work. Their feelings are clearly powerful, but are rarely acknowledged in the media or in mainstream discourse.

“I find myself staring at my woodpile going, yea!!! Cutting it, splitting it and getting off your own property, there is quite a bit of satisfaction in that.” — wood heat user, Milne 2003

“Splitting wood is a favourite pastime of mine. There is nothing better than that perfect swing and watching the two pieces fall from the stump where one log once stood. Sort of like what a golfer must feel on a perfect drive.” — Jim, woodheat.org

Beyond the satisfaction of producing one’s own fuel, the practice of wood heating also creates strong attachments linked to the feeling of the warmth, and the sense of security and control wood heating offers.

“I never thought someone could get so addicted to wood heat. It beats TV any day.” — Eric, woodheat.org

“Once they have burned that stove for about a month and a half, they would probably burn that stove for the rest of their life because it is addictive.” — a woodstove dealer, Milne 2003

Wood heating is sometimes viewed as a masculine activity, but upon closer examination the involvement of women in the practice of wood heating becomes more evident.

“At first I was worried about having a fire going at night while we sleep. But now, after I have started the fire, tended and watched it from start to finish, I feel comfortable knowing what is happening inside that firebox.” — Doris, woodheat.org

“I gotta tell you, I just LOVE this heat!!!  We always feel warm — a nice, toasty warm. I've never experienced this kind of heat before. Oh yeah, I’m hooked!” — Cindy, woodheat.org

The Woodlot, Hearth and the Family

Wood heating is best viewed as a lifestyle choice as much as a fuel choice. This is borne out by the words of people who heat with wood.

“People think I’m crazy when (I’m) asked about hobbies or what I’ll do in retirement and I say, ‘Burn wood.’” — Bob, woodheat.org

Wood heating is also compatible with a personal commitment to social and environmental responsibility because accountability for the associated impacts is accepted by the user.

“Wood is the nicest thing there is. It is renewable. Trees grow again. I know a lot of the oldtimers, they cut their bush so they would always have firewood and always have good trees. They learned from their dads.” — wood heat user, Milne 2003

Historically, in households that heat with wood the outdoors was the male domain where trees were felled and firewood processed, and inside the house was the female domain where fires were maintained and meals were cooked. This pattern still holds to some extent, but there is much overlap.

“Mom actually does the largest part of the piling of the wood into the wood shed — we go through 6 to 8 full bush cords a year, so she manages that.” — wood heat user, Milne 2003

Talking Fuelwood: Community Cohesiveness

Milne notes that “Participants talked in terms of wood energy being the one thing in their community that bridges class, gender, race and philosophical divisions.” Here are the words of some of her informants:

“I think in a community of people who all use the same kind of energy, that there is a certain understanding that goes with it. I think everybody loves woodheat.” — user Milne 2003

“Wood links us in a lot of different ways. In conversation and common understanding, and it is one of the ways we have of a more solid connection with the farming community.” — user Milne 2003

Milne goes on to explain that “(w)ood energy is part of the culture, language and story telling of the area. One of the sayings I heard numerous times in the interviews was: ‘Did you hear the one about wood heating you four times: when you cut it, when you split it, when you stack it, and when you burn it.’ A couple of participants also recalled the skit that the local theatre group did about how you can tell a lot about a man by his woodpile.  It goes something like this: ‘The wood pile leaning to the left is a socialist, the John Birch woodpile is all white, and the guy who burns 24-inch wood has inadequacy issues.’”


Essential Resource or Pollution Problem?

Judged by policy-discussion coverage about our energy future, wood heating is virtually nonexistent. Most politicians don’t debate its merits or plan for its strategic use. The one area in which wood burning does attract attention is the problem of air pollution. As a result, wood burning has become most often identified as a problem to be solved rather than as an opportunity to be harvested. Almost no governments encourage homeowners to heat with wood. Fuelwood is the only renewable energy resource most public officials don’t seem comfortable with.

The low profile of wood heating in energy policy discussions and in the media reflects the fact that policy — even rural policy — is developed in big cites, and that the large media outlets are all urban in location and outlook. And no large corporations are involved in wood heating, and therefore no high-priced lobbyists or special interest groups prowl the halls of legislatures pleading the case of wood burning. So, despite the fact that millions of families burn wood at home, its role as an energy source rarely appears on government or media radar.

In a world of touch-screen convenience, pocket-sized computers and automatic climate-controlled environments, wood heating is in every way rough, basic and steadfastly hands-on. People who heat with wood seem out of step with the modern world swirling around them. Have wood burners and those who labor to supply them with fuel slipped through a crack in the cozy consensus of modernity? Or are they onto something meaningful that has been missed by the mainstream?

The producers and consumers of fuelwood are engaged in an activity that reduces net greenhouse-gas emissions while others merely fret about global warming. The fuelwood fraternity uses a renewable-energy resource, taking pressure off dwindling supplies of ever-pricier and scarce fossil fuels. Buyers of fuelwood create jobs close to home and strengthen their local communities. They know more about the cause-and-effect relationships of energy production and consumption than those who simply pay utility bills. The story of wood heating early in the 21st century is about average families making decisions based on how they see their future unfolding.

Heating with wood is about a lot more than home heating. It is a tangible expression of self-reliance, of the courage to buck the trends and to resist the appeal of sedentary, push-button convenience. Heating with wood reinforces links to the land and is a willing submission to the cycle of the seasons. It provides stability and security in a turbulent world.

To its owner, the woodlot is a living community in constant evolution, while to the urban observer it may be seen as a museum in which the removal of a tree exhibit renders it diminished. The woodlot owner watches its quality improve over the years, even as it yields products and creates employment. The owner’s household earns part of its income by being a fuel supplier to its neighbors. It is a gentle way to produce energy compared to mountain-top-removal coal mining and nuclear reactors.

Fuelwood is the ultimate populist energy resource, the most easily accessed and affordable of all renewable energies. The major environmental impact of wood heating is visible for all to see in the form of smoke emissions, making everyone who uses it instantly accountable for their actions. The families that heat with wood and those that supply them with fuel do so privately, without fanfare or acknowledgement. It seems they wouldn’t want it any other way. Heating with wood is its own reward. This is a private activity in which virtually everyone involved is content to remain anonymous, quietly keeping their families warm through their own labor and ingenuity.

But with so few individuals and groups speaking up to defend the responsible use of wood fuel, the families that depend upon it may soon be faced with unreasonable restrictions. Those who want to see wood heating banned are gaining influence, and more governments are treating wood heating as a pollution problem and not as a renewable energy resource that needs to be improved.


Previous | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | Next






Post a comment below.

 

vacuum1313
3/7/2010 2:07:13 PM
Bat, wood heat is green. Like everything else in life there is doing it right and doing it wrong. A properly combusted wood fire will produce no more particulates than oil or NG. Properly combusted you get steam and CO2, unfortunately most, even EPA approved items don't. Even then if you look at the net environmental effects of the energy sources wood comes out way ahead.

vacuum1313
3/7/2010 1:50:14 PM
jgulland replied to my concerns by quoting Dr. Anthony Trofymow "I think that for upland temperate forests any methane production from wood decay termites is likely balanced by methane oxidation in the soil by methanotrophic bacteria and thus there is likely zero net release of methane from wood decaying in upland forests." Methanotrophic soil bacteria do not jump into the air and digest the methane there. They do work on the methane produced by the degradation of the stump and roots of a tree and subsoil organics. Speaking from DIRECT experience methane builds up in many slash piles especially during wet seasons, and both the last 2 summers have been very wet in NE Ontario, and when the slash piles are in swampy terrain, somewhat common as they are used to fill and support equipment movement. Mr Trofymow and I are thus speaking of 2 different sinks. Once the methane enters the atmosphere It will have it's negative effect. If he is indicating that the natural migration of air through the soil allows the soil organisms to clean out the methane I would appreciate specific references to journals and articles to support this contention. I am well aware that methanotrophic bacteria exist and how they work, I very much disagree they provide balance in human disturbed systems.

Lee Einer
3/7/2010 11:02:33 AM
I have a masonry heater in my home, a 1950's adobe. I use about 2 cords of wood, per winter. And I live in the foothills of the Sangre de Christos, where the winter is generally both long and cold. Much of the air pollution associated with woodburning can be alleviated by simply (1) burning dry wood and (2) building fires correctly for a top-down burn. A good, low-smoke fire with a top down burn is accomplished by stacking firewood log cabin fashion, big pieces on the bottom, progressively smaller pieces towards the top, and by igniting the fire at the top of the stack rather than the bottom. With the initial combustion at the top of the fire, smoke from beneath must pass through the area of the flame, and is combusted rather than rising up the flue in the form of creosote. Far more of the pollution can be eliminated by using a stove which burns HOT with ample oxygen, storing the heat in thermal mass. A masonry heater or siberian wood stove is one option, a rocket stove with its flue routed through a mud, stone or adobe banco (bench) is another.

jgulland
3/5/2010 10:24:30 AM
vacuum1313 wrote: "This calculation failed to take into account that if the wood is simply left in the forest a great deal more methane is produced." Actually, my research revealed that methane is produced by the rotting of trees in only very wet conditions like in a swamp. Dr. Anthony Trofymow of Forestry Canada wrote in response to my question about methane emissions from forests: "I think that for upland temperate forests any methane production from wood decay termites is likely balanced by methane oxidation in the soil by methanotrophic bacteria and thus there is likely zero net release of methane from wood decaying in upland forests." Not too much firewood is taken from swamps, so I stand by the analysis offered in the article John

bat
3/5/2010 9:53:44 AM
Wood heat is not green! Unfortunately, wood heat (also with EPA approved stoves!) produces an intolerable amount of air pollution. Huge amounts of small particulates are produced by any kind of wood heat (compare the amounts at burningissues.org)in comparison to oil and gas heat. These airborne small particulates are asscociated with asthma and other lung diseases. What price are we willing to pay for "cheap" heat? I am very disappointed that Mother Earth is conveying such limited information on the issues associated with wood burning.

vacuum1313
3/5/2010 9:07:12 AM
Secondly, woodstoves are inefficient for 3 reasons, bad design, bad fuel and trying to control the rate of burn. have you ever noticed a hot, fast fire has virtually no smoke? This is because it gets enough O2 for complete combustion. This leads to bad design, fast fires are too hot and uncomfortable unless you have a way of storing the heat. High thermal mass stoves that store the heat in masonry, water, stone etc don't get uncomfortable, They store the heat of a short fast fire for hours and release it slowly. Without a lot of technology these are some of the most efficient burners out there and range in cost from many thousands, many tonne masonry heaters, to very little, the rocket mass heater (http://tinyurl.com/yjc5q9l). Lastly is bad fuel. This is exemplified by a conversation at an outdoorsmans club this week. An older member commented on having to pull cups of water out of his trap after every burn. On asking about the fuel it was birch logs delivered in the fall. They were cut but not seasoned hence very high in water! And he wondered why he wasn't getting much heat. Wet fuel burns relatively cold and has lots of incomplete combustion. MEN started life as a DIY learn the skills magazine. It's unfortunate to see how far from these roots the commercialized version has come.

vacuum1313
3/5/2010 8:52:24 AM
Just a couple of comments. The first is regarding the CO2 neutrality figures and the inclusion of methane. This calculation failed to take into account that if the wood is simply left in the forest a great deal more methane is produced. If left until they die a lot more methane enters the atmosphere at about 20x more greenhouse effect. Thus combustion vs rot results in a CO2 negative effect (if methane is converted to CO2 equivalents which is what the calculation presented here does). If the timber is harvested and used in construction it goes to landfill at some time and again becomes methane. The calculations used here are a good example of bad math, not considering the entire cycle of a product just one part of it, this is the thinking that eventually led to our throwaway society. Parts 2 and 3 to come, won't fit in the character limit.

Gina_4
3/5/2010 8:03:13 AM
I live in a village where most people heat with wood but nobody is replanting trees and nobody has an efficient stove, I guess, because in the winter I have to drive to the corner store – if I try to walk on the street I choke from all the smoke! I've had to build a gym in my house in order to get some exercise in the winter.

davisonh
3/3/2010 7:24:33 PM
I've been using my outside boiler since 2003,I have turned my propane on twice in the last seven years for a few minutes to see if it still works.Other than that Ive done all wood.

BucksCoBernie_2
3/3/2010 6:55:07 AM
I love my insert! This is my first winter heating with wood and it has saved me a ton of $ by not having to buy oil, and my house is a lot warmer with the wood heat than it was with the oil furnace running. Its a lot of work to heat with wood, especially if you scrounge and process your own wood like I do. But even if you dont you still have to load the stove a few times a day, empty out ashes, clean the chimney. It can also be a headache if you're not burning well seasoned wood as the fires dont get as hot as they would with dryer splits. If you're thinking about heating with wood next winter start gathering and splitting your wood NOW. Or if you're ordering from a dealer purchase your cords NOW. Do not wait till next winter or you will have a miserable experience with green or under seasoned wood. Always work a year or 2 ahead.








Subscribe Today - Pay Now & Save 66% Off the Cover Price

First Name: *
Last Name: *
Address: *
City: *
State/Province: *
Zip/Postal Code:*
Country:
Email:*
(* indicates a required item)
Canadian subs: 1 year, (includes postage & GST). Foreign subs: 1 year, . U.S. funds.
Canadian Subscribers - Click Here
Non US and Canadian Subscribers - Click Here

Lighten the Strain on the Earth and Your Budget

MOTHER EARTH NEWS is the guide to living — as one reader stated — “with little money and abundant happiness.” Every issue is an invaluable guide to leading a more sustainable life, covering ideas from fighting rising energy costs and protecting the environment to avoiding unnecessary spending on processed food. You’ll find tips for slashing heating bills; growing fresh, natural produce at home; and more. MOTHER EARTH NEWS helps you cut costs without sacrificing modern luxuries.

At MOTHER EARTH NEWS, we are dedicated to conserving our planet’s natural resources while helping you conserve your financial resources. That’s why we want you to save money and trees by subscribing through our earth-friendly automatic renewal savings plan. By paying with a credit card, you save an additional $5 and get 6 issues of MOTHER EARTH NEWS for only $12.00 (USA only).

You may also use the Bill Me option and pay $17.00 for 6 issues.