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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 combination of antifreeze and water, which is then circulated throughout your house. When combined with dry wood and EPA-approved outdoor boilers, they can be an eco-friendly alternative to fossil heating. They still generate lots of smoke. Energy Efficiency