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How to Properly Install and Maintain an Outdoor Wood Burner Outdoor wood burners, often called wood boilers, look like small sheds that have the appearance of a small smoke stack. They heat water or a mixture of antifreeze and water which is then circulated around your home. When used in conjunction with dry wood and EPA-approved outdoor boilers, they can be an eco-friendly alternative to fossil heating. However, they still generate an enormous amount of smoke. Energy Efficiency Since the beginning o