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How to Properly Install and Maintain an Outdoor Wood Burner Outdoor wood burners, also called wood boilers, appear like small sheds that have a short smoke stack. They provide heat to water or a mixture of water and antifreeze which is then circulated through your home. When outdoor wood boilers approved by the EPA are used with dry wood, they can provide an eco-friendly alternative to fossil fuel heating. However, they still generate substantial amounts of smoke. Energy Efficiency Since