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Safe-exhaust furnaces are gas-fired units that completely isolate the supply of combustion air and combustion gas exhaust from indoors. As a result, combustion gases cannot spill into the home. In contrast, less-efficient gravity-exhaust natural gas- or propane-fired furnaces draw combustion air...

Safe-exhaust boilers are gas-fired units that completely isolate the supply of combustion air and combustion gas exhaust from indoors. As a result, combustion gases cannot spill into the home. In contrast, less-efficient gravity-exhaust natural gas- or propane-fired boilers draw combustion air from...

Safe-exhaust water heaters are gas- or oil-fired units that are power vented. These systems completely isolate the combustion gases being exhausted from indoors. As a result, combustion gases cannot spill into the home. The safest systems also include a dedicated source of outside air for combustion...

Ventilated fireplaces typically burn natural gas or propane and use a vent to bring outside combustion air directly into the firebox. These fireplaces have tight-fitting glass doors across their face to prevent conditioned room air from being used as combustion air and then expelled through the flue...

According to the Energy Information Administration, water heaters can account for 19% to 32% of a homeowner’s utility bill. One option to reduce the amount of energy needed for water heating is to install a high-efficiency natural gas or propane water heater. Building America recommends using a...