Vent-free units have no flue, so they can be installed anywhere—even hung on a wall like a flat-screen TV. They're up to 99 percent efficient because all their heat stays in the room—as do all the pollutants. | Illustration: Rodica Prato
This ProCom Dual Fuel Vent-Free Fireplace offers classic styling, comfort and energy-savings with no venting required. Dual fuel capability allows it to run on natural gas or propane to provide continuous heat even during a power failure.