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How to Properly Install and Maintain an Outdoor Wood Burner Outdoor wood burners are often called wood boilers. They look like small sheds with an elongated smokestack. They are heated by water, or a combination of antifreeze and water, which is then circulated throughout the house. When outdoor wood boilers that are EPA-approved are utilized with dry wood, they can be an environmentally friendly alternative to fossil fuel heating. They still generate a lot of smoke. Energy Effici