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The main difference between an outdoor wood furnace versus an outdoor wood boiler is what each appliance is heating. An outdoor wood furnace burns wood to create heat, which warms the air and moves it through the ducts in your home. An outdoor wood boiler uses the heat from burning wood to warm water, which goes through pipes to radiators in the home.

Yes, a chimney cap is an excellent idea for several reasons. It prevents debris, rain, or snow from entering your chimney, which can cause moisture damage or blockages. A cap with a mesh screen also keeps animals like birds, squirrels, and bats from nesting in your chimney—or worse, getting into your abode. Additionally, chimney caps help prevent downdrafts, which can push smoke and harmful gases back into your home. Lastly, by installing a chimney cap, you will improve safety and enhance the overall efficiency of your fireplace.

While you have some flexibility in the types of wood you can use in your outdoor furnace, it's important to make wise choices for optimal performance and efficiency. Hardwoods, such as oak, maple, and cherry, are generally recommended for their higher energy content and cleaner burn. These hardwoods produce more heat per volume and tend to produce fewer creosote deposits, which can accumulate and cause a chimney fire, according to the U.S. Environmental Protection Agency.

A chimney sweep costs $130 to $380, with an average price of about $255. It’s important to schedule a chimney cleaning—and inspection—annually, preferably before you start using your fireplace. A chimney sweep will clean the entire flue, scraping off creosote, dirt, and other debris.