|Boilers||Rating of 85% AFUE* or greater (About 6% more efficient than the minimum federal standards.)|
ENERGY STAR partner agrees to sell one or more specific models of boilers that meet or exceed 85 percent AFUE energy efficiency ratings. Residential Boiler: A self contained fuel burning appliance of less than 300,000 Btuh energy input, for supplying low pressure steam or hot water for space heating applications. A heating unit that meets this definition and also provides hot water for domestic or other use is considered a boiler. Combination Space-Heating and Water Heating Appliance: Appliance that provides both space conditioning (boiler) and hot water heating with one appliance or energy source. The combination appliance circulates hot water from the water heater through a heat exchanger in the air handler. A blower will move the heated air through a standard duct system. In the summer, an air conditioner is connected to the exchanger and the system functions similarly, with cool air being pushed through the ductwork.