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How to Properly Install and Maintain an Outdoor Wood Burner Outdoor wood burners are typically called wood boilers. They resemble small sheds with the appearance of a small smokestack. They provide heat to water or a mixture of water and antifreeze which is then circulated through your home. When outdoor wood boilers that are EPA-approved are made of dry wood, they are an eco-friendly alternative to fossil fuel heating. They still emit a lot of smoke. Energy Efficiency Since centuries, wood heat has been used to warm homes