Topical Terminology > Annual Fuel Utilization Efficiency (Afue)
1 Definition
Annual Fuel Utilization Efficiency (AFUE)
For Annual Fuel Utilization Efficiency (AFUE) we have a term and definition in Natural Gas.
Annual Fuel Utilization Efficiency (Afue) (Natural Gas) 
AFUE measures average annual seasonal efficiency of a gas furnace or boiler and may be expressed as total heating output divided by total energy (fuel) input. AFUE's for furnaces can range from 55% to 97%.
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