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How to Properly Install and Maintain an Outdoor Wood Burner Outdoor wood burners, sometimes called wood boilers, look like small sheds with an elongated smoke stack. They provide heat to water or a mixture of water and antifreeze that is then circulated throughout your home. When outdoor wood boilers that are EPA-approved are utilized with dry wood, they can provide an eco-friendly alternative to heating with fossil fuels. However, they do produce a significant amount of smoke. Energy Efficie