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If your gas fireplace is vented through a chimney, a chimney cap is highly recommended. While not all gas fireplaces require a traditional chimney, for those that use one, a cap provides several key benefits. It prevents rain, debris, and animals from entering the chimney, which can cause blockages or damage. A cap also helps prevent downdrafts that could push harmful gases like carbon monoxide back into your home. When installing a cap, ensure it is appropriate for a gas fireplace and does not restrict proper ventilation.

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.

You can safely build a fire pit on your patio as long as you use porous, fire-resistant pavers or a fire pit mat over existing pavers. Otherwise, you’ll need to have exposed ground beneath your pit. You’ll also need to make sure the location for the fire pit is far enough away from your house and any other nearby structures.

Your state, city, or even homeowners insurance company may have requirements on how far the outdoor wood furnace should be from the house, so be sure to abide by those regulations. In general, you should install an outdoor wood furnace or boiler as few as 30 feet or as much as 500 feet from the house or any other building.