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How to Properly Install and Maintain an Outdoor Wood Burner Outdoor wood burners are typically called wood boilers. They resemble small sheds that have an elongated smokestack. They are heated by water, or a mixture of antifreeze and water which is then circulated throughout your house. When EPA-approved outdoor wood boilers are used with dry wood, they can be an eco-friendly alternative to heating with fossil fuels. However, they still produce substantial amounts of smoke. Energy Ef