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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 an elongated smokestack. They heat water or a mixture of antifreeze and water that is then circulated throughout your home. When outdoor wood boilers that are EPA-approved are made of dry wood, they are an environmentally friendly alternative to heating with fossil fuels. They still produce plenty of smoke. Energy Efficiency Since the beginning of time, woo