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How to Properly Install and Maintain an Outdoor Wood Burner Outdoor wood burners are commonly called wood boilers. They look like small sheds with the appearance of a small smokestack. They are heated by water, or a mixture of water and antifreeze, which is then circulated throughout your house. When EPA-approved outdoor wood boilers are utilized with dry wood, they are an eco-friendly alternative to heating with fossil fuels. However, they do produce a significant amount of smoke. Energy Efficiency Wood heat has been a popular option to heat homes