What is AFUE?
This figure represents a more realistic measurement of useable heat as it applies real-life influences to the efficiency of the fireplace. Annual Fuel Utilization Efficiency is also determined by the results of some specific test conditions but these results are further calculated with other influences such as average daytime and nighttime temperatures, heat loss due to the standing pilot and from cold start up. All sorts of data is calculated to provide the overall average efficiency of the fireplace throughout the year.
The Annual Fuel Utilization Efficiency. In a general sense, it is a measure of the amount of heat that you actually get inside of the home compared to the amount of heat that is being used by the system. As an example, a 100,000 BTU, 80% AFUE gas furnace will provide 80,000 BTU’s of heat into the home if it runs for one hour. The other 20,000 BTU’s of heat will go up the chimney as products of combustion.
Furnace Efficiency is rated by its Annual Fuel Utilization Efficiency (AFUE), which is the ratio of heat output divided by the heat input. This measures how completely the gas or oil fuel is consumed as the furnace heats your home. The higher the AFUE, the lower the fuel cost. Furnaces in the United States must have a minimum 78% AFUE rating.
This figure represents a more realistic measurement of useable heat as it applies real-life influences to the efficiency of the fireplace. Annual Fuel Utilization Efficiency is also determined by the results of some specific test conditions but these results are further calculated with other influences such as average daytime and night time temperatures, heat loss due to the standing pilot and from cold start up. All sorts of data is calculated to provide the overall average efficiency of the fireplace throughout the year.
AFUE is the abbreviation for Annual Fuel Utilization Efficiency ratio. AFUE is used to rate furnace efficiencies by dividing the ratio of heat output by heat input. This measurement describes how well fuel, gas or oil is consumed to produce heat by a furnace. As the AFUE rate increases, the efficiency of your furnace also increases, lowering your fuel costs. Furnaces manufactured in the United States are required to have at least an 80% AFUE.
