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How to Properly Install and Maintain an Outdoor Wood Burner Outdoor wood burners, also called wood boilers, look like small sheds with a short smoke stack. They provide heat to water, or a mix of water and antifreeze, which is then circulated throughout your house. When used in conjunction with dry wood and EPA-approved outdoor boilers they offer an environmentally-friendly alternative to fossil heating. However, they still generate a significant amount of smoke. Energy Efficiency Wood heat has b