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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 with the appearance of a small smoke stack. They heat water, or a mixture of antifreeze and water which is then circulated throughout your house. When EPA-approved outdoor wood boilers are made of dry wood, they are an environmentally friendly alternative to heating with fossil fuels. They still produce lots of smoke. Energy Efficiency Since the beginning