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How to Properly Install and Maintain an Outdoor Wood Burner Outdoor wood burners are commonly called wood boilers. They resemble small sheds with a short smokestack. They provide heat to water, or a mix of antifreeze and water which is then circulated throughout your home. When EPA-approved outdoor wood boilers are made of dry wood, they are an environmentally friendly alternative to fossil fuel heating. They still produce lots of smoke. Energy Efficiency Since the beginning of time, wood heat has been us