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How to Properly Install and Maintain an Outdoor Wood Burner Outdoor wood burners, sometimes called wood boilers, appear like small sheds that have a short smoke stack. They heat water, or a mixture of antifreeze and water which is then circulated throughout the house. When combined with dry wood and EPA-approved outdoor boilers, they can be an eco-friendly alternative to fossil heating. They still generate a lot of smoke. Energy Efficiency Wood heat has been a popular option to heat homes for centuries. Today, with fluctuating prices for fossil fuel