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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 are heated by water, or a mix of antifreeze and water, which is then circulated throughout the house. When outdoor wood boilers approved by the EPA are utilized with dry wood, they can be an eco-friendly alternative to heating with fossil fuels. They still emit plenty of smoke. Energy Efficiency Since centuries, wood heat has been