Environmental Impact of Wood-Burning Stoves

With oil, fuel oil, and electric rates at recent highs, more homeowners want effective heating systems. Wood burners—also called wood-burning stoves—are an option and offer the benefit of using renewable fuel sources because we need fewer trees for replacement. But what is the environmental impact of wood-burning stoves?

Experts have problems with the smoke, carbon, and pollutants released from burning wood. The first few years take several years of planting to replenish the trapped carbon emitted from burning wood. It contributes to environmental pollution.

This article aims to explain the environmental impacts of wood-burning stoves. We also discuss a brief history of wood stoves before going into detail about their effects on human health and wildlife. We conclude with ways to protect yourself from wood-stove pollution and some alternatives to wood stoves.

A Brief History: What are wood-burning stoves?   

Wood-burning stoves are heating appliances made for burning wood fuel. Wood stove manufacturers make wood stoves from iron or steel. They come in different shapes and sizes for various purposes. Small wood-burning stoves are usually more suitable for single rooms, tiny energy-efficient homes, and large homes that require more heat. 

You can use medium wood-burning stoves to heat small and midsize homes, while large burners work best in large houses and older homes in cold climate regions. A wood-burning stove is a wood-burning fireplace not built into the house. 

Depending on the type and design purchased, a wood burner can also double as a cooking stove. Looking at the history of wood burners, we discovered that Benjamin Thompson invented the first metal wood-burning stove, the Rumford stove, in 1800.

Philo Stewart created a compact, cast iron wood stove, which became popular in 1834. It sold 90,000 units by 1864. As the wood-burning stove industry progressed, Sam Daniels marketed the first most used hot air wood furnace in the United States. In 1940, records show that 23% of United States homes used wood as a primary heat source.

Pellet stoves were invented in 1973, but production began in the early 1980s. The first pellet stove was introduced to the United States in 1983. In 1982, almost everyone was using wood stoves, leading to the establishment of 450 stove manufacturing companies. Wood-burning stove sales increased to a whopping 1.5 million annually.

In 2019, the Department of Energy funded research and development of residential wood-burning stoves. Two companies received a $3 million grant to create automated wood burners.

Environmental Impact Of A Wood-burning Stove? 

Most people believe using wood as fuel oil instead of fossil fuels and natural gas is a better option. Unfortunately, it is not. Just because we can plant new trees to replace the ones we burn doesn’t mean it is not bad for the environment. 

Are log burners bad for the planet? Here are some reasons why it hurts the environment:

1. It causes a significant amount of air pollution.  

Using a log burner contributes to poor air quality. It releases carbon dioxide and particulate matter into the atmosphere. Wood contains carbon dioxide absorbed from the atmosphere during the photosynthetic process. The type of wood, age, and condition of the log burner also influence the level of air pollution in the atmosphere. 

Burning wood releases the years of accumulated carbon dioxide absorbed back into the atmosphere. It produces a lot more carbon emissions than burning fossil fuels. Log burners produce carbon dioxide¹ 2.5 times more than natural gas and 30% more times than coal.

Log burners also produce other harmful gases, such as carbon monoxide, nitrogen dioxide, aldehydes, and benzene. These contribute to the rising risks of global warming, accelerating the occurrence of climate change. 

You might think wood stoves are sustainable, but they aren't. You will be surprised to discover that wood burners produce more particle pollution than road traffic. Statistics from Canada show that wood stoves produced more particulate matter than Canada's entire transportation sector. 

Canadian wood stoves produced 80,000 metric tons of fine particulate matter, while the transportation sector produced 31,000 metric tons. It also applies to the United Kingdom and the United States. The urban areas in these countries emit more particulate matter than the transportation sector.

Regions with the highest particle production in the U.S. are 92% in Lakeview, Oregon, 86% in Klamath Falls, Oregon, 58% in Portland, Oregon, and 31% in Seattle, Washington. In the European Union, wood-burning stoves contribute 51% to the total particulate emissions.

Paris and other parts of Ile-de-France produce 30% of particle pollution during winter, while the Netherlands produces 23% of fine particles. Wood fires are a primary cause of pollution in New Zealand⁷. They produce 79% of P.M 2.5 during winter, while Australia produces 51%.

2. It harms wildlife.  

Cutting trees to provide heat disrupts many wildlife habitats. With nearly 1.8 million American homes using wood as a heat source, imagine the number of animals impacted by the loss of the trees used by one household.

It causes deforestation, which leads to habitat loss and fragmentation. It impacts the survival of many species to a great extent, especially animals that rely on trees for food. 

Log burners are also bad for the environment because of the fine particles they release. These particles enter water sources like lakes, streams, and rivers, making them acidic. The particles also change the nutrient balance in coastal waters and large river basins. Animals and other wildlife can not drink from these water sources because it can harm them.

Depending on the chemical components of the particles, it can drain the nutrients in the soil. The depletion of soil nutrients also impacts the plants and greenery in the soil. Sensitive forests and farm crops become damaged and contribute to acid rainfall⁵.

Furthermore, wood smoke can cause a range of health reactions in animals³. These allergic reactions are: 

• Eye irritation
• Throat and mouth inflammation 
• Coughing or gagging
• Nasal discharge 
• Fatigue and weakness
• Reduced appetite and thirst
• Difficulty breathing

It is important to note that using wet wood increases the impact of a log burner on the environment. Wet wood is a wood plank with at least 20% moisture content. It is more harmful because it releases more particulate matter.

3. Burning wood stoves is harmful to human health.  

Another reason wood-burning stoves are bad for the environment is their impact on human health. Wood smoke pollution has a devastating effect on children and adult humans. It contains harmful components like fine particles, volatile organic compounds (VOCs)², carbon monoxide, and polycyclic aromatic hydrocarbons (PAHs). 

Fine particle matter is one of the most dangerous components of wood smoke. They are microscopic particles that can enter your respiratory system and eyes. Once these particles enter your body system, they can cause burning eyes and runny noses. They also increase the risks of other respiratory illnesses.

Children are more vulnerable to wood fires. Its effects on children include respiratory infections, reduced lung growth, asthma, and lower lung function. Children with prolonged exposure to wood smoke pollution, especially from indoor wood-burning fireplaces, are prone to upper respiratory tract infections like bronchitis and bronchiolitis.

Research literature shows that children born in urban areas with high usage of wood-burning stoves have a lower birth weight. For example, 700,000 births in Los Angeles, an area with severely polluted air quality, have lower weight. 

Children are easily susceptible to the smoke from fire logs because they breathe in more air than adults, and their respiratory systems are still developing. Besides children, older people are also vulnerable to the effects of a wood burner. Pollutants from a wood fire can also increase your chances of getting COVID-19.

4. It leads to climate change, which has a devastating effect on diverse ecosystems.   

Wood-burning stoves contribute to the rising rates of temperature change in the environment. Burning timber interferes with carbon sequestering, a vital function of trees in the forest. Trees help foster carbon neutrality by soaking carbon dioxide from the atmosphere and storing it in the soil and their trunks. 

Felling trees to burn wood and produce more heat is not environmentally friendly. It releases all the stored carbon dioxide into the air, further ruining the environment’s air quality. Burning timber also contributes to carbon monoxide in the air. It is difficult to absorb the released carbon again. 

Growing trees takes a lot of time to reabsorb, and restoration will only happen if we replant the trees we cut down. Wood-burning stoves also release black carbon, better known as black soot, into the atmosphere. Carbon dioxide and black carbon traps heat in the atmosphere, causing the environment to become hotter.  

Wood stoves produce more black carbon than other fossil fuels. An example is the statistics given by the California Air Resources Board. The board projected that burning wood will be the primary source of black carbon by 2030. 

A ton of black carbon in the atmosphere is equivalent to the impact of 900 tons of carbon dioxide in the atmosphere. It warms the planet and affects the size and cloud droplet distribution, leading to a change in rain patterns. It can also change the amount of sun rays reflected into space.

If black soot lands on areas with snow or ice, it darkens the area, and the absorption of the sun’s heat melts it rapidly. Burning wood also releases methane into the atmosphere. Methane is much more harmful than carbon dioxide. According to the Intergovernmental Panel on Climate Change, methane is 88 times more potent over 20 years than carbon emissions and 34 times more in 100 years⁶. 

Is a wood stove environmentally friendly at all?  

A wood-burning stove has some environmentally friendly benefits, especially because it doesn’t use fossil fuels. Yes, there are wood stoves with reduced carbon footprint. 

A wood-burning stove is eco-friendly because it uses a renewable energy source, wood. We can always plant new trees to replace the ones we cut down, unlike coal and oil, which are finite resources. Also, extracting fossil fuels damages the environment more than felling trees.

It reduces our dependence on fossil fuels. The sustainability of a wood stove depends on how we manage wood fuel as a resource. A wood stove can be carbon neutral if we fall trees sparingly and plant new ones to absorb the carbon emitted from burning wood.  

Also, cutting trees in a managed ecosystem is beneficial to wildlife. Opening tree canopies creates space and new habitats for animals. Sunlight reaches the bottom of the open canopy, fostering the growth of new plants and microorganisms.

There are environmentally friendly stoves designed to use less wood, producing fewer greenhouse gas emissions and volatile organic compounds. A wood stove is also carbon neutral because it uses less fuel than other heat sources. A burner with a closed combustion system fits into this category. It burns wood completely and reduces heat loss.

Wood stoves are also eco-friendly because they radiate heat into a room, which is better than heating a house with a central heating system. The correct positioning of your stove will help you distribute heat properly without wasting energy. 

Additionally, wood fuel is the cheapest fuel form in the environment. In an average household, wood pellets are 33% cheaper than electric heating and 13% cheaper than gas central heating⁴. 

How to protect yourself from wood smoke? 

According to the American Lung Association, here are some ways to protect yourself from burning wood pollution: 

1. Only use the EPA-certified wood-burning stove because it is more environmentally friendly. 

2. Only use a wood stove as a primary heat source to reduce pollution in your home and immediate environment. 

3. Avoid buying a log burner that is larger than your living space. This will create excess heat and burn excess energy.

4. Don't burn wet wood. Burn dry wood instead. As mentioned earlier, damp wood releases a lot more PM 2.5. Use wood cut and dried for up to six months or more. 

5. You can use hardwoods like oak, maple, and birch or softwoods like pine, fir, and spruce. 

6. Ensure proper ventilation and remove ashes regularly. Never use unventilated stoves indoors because it increases the accumulation of volatile organic compounds and particulate matter.

7. Always close doors and windows when the air quality is poor. 

8. You can also use an air purifier or air cleaner to reduce indoor emissions. 

9. Stay indoors when you're using wood burners outside. Older people and children should afford to stay around areas with smoke, especially people with cardiovascular health problems. 

10. Using dust masks doesn't filter out P.M 2.5 adequately. The masks are well suited for bigger particles. You can use N-95 masks to filter tiny particles, but they're not for people with lung diseases. Consult a doctor before you use masks. 

11. Always roll up your car windows when passing by smoky areas. 

12. Do not exercise outdoors when you notice smoke or your eyes and throat are irritated. 

13. Avoid using old wood stoves in your homes. Older log burners don’t burn wood efficiently and produce more pollution.

Alternatives To Wood-burning Stoves  

There are wood stove exchange programs that replace older stoves with new, cleaner heat sources like electric heat pumps, gas stoves, pellet stoves, or wood stoves with lower emissions. For example, in Canada, the wood stove exchange program has replaced 9,000 stoves with cleaner options since 2008. 

You can install an alcohol gel fireplace. It doesn't produce fumes or pollution; its only environmental impact is small amounts of carbon monoxide. It uses isopropyl alcohol fuel and lasts up to three hours. 

You can also use a natural gas fireplace or bioethanol burners, although ethanol burners produce water vapor and carbon dioxide. 

Conclusion: Environmental impact wood burning stoves

Wood burners are excellent heating options because they are affordable. It also uses a renewable energy source. However, it pollutes the environment- especially when it's an old stove. It is best to purchase an EPA-certified stove to avoid the emission of nitrogen oxides. 

Ensure you clean and maintain your stove efficiently. Also, have it inspected by a professional at least twice a year to prevent excessive pollution. Remember to store wood pellets in a dry place, especially during winter. You can also opt for other alternatives that use natural gas or electricity.