The annual fuel utilization efficiency (AFUE) is the percentage of fuel that produces heat for your comfort versus heat lost up the chimney.
Currently, ENERGY STAR gas boilers must have an AFUE of at least 90 percent, while ENERGY STAR oil boilers must have an AFUE of at least 87 percent. An electric boiler with no chimney losses has an AFUE rating of 100 percent.
Older, low-efficiency boilers can have an AFUE as low as 55 percent. That means you could potentially cut your heating bill in half by switching out an old, low-efficiency boiler for a new, high-efficiency unit.
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