Heating Subsystem
Although most boilers are gas- or oil-fired (93 percent of the market), those that are electric typically operate at only 65 to 75 percent efficiency. Consider upgrading to a more energy-efficient system. High-efficiency boilers have up to 90 percent combustion efficiency. The combustion efficiency of a typical boiler or furnace is 75 percent to 80 percent. Older boilers and boilers converted from coal have 60 percent to 70 percent combustion efficiency.
Resources
U.S. Environmental Protection Agency, ENERGY STAR Building Manual: Heating and Cooling System Upgrades.
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