Annual fuel utilization efficiency, abbreviated as AFUE, a dimensionless number, measure the efficiency of a gas furnace or boiler will operate over an entire heating season.
Annual Fuel Utilization Efficiency Formula |
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\( AFUE \;=\; \dfrac{ E_o }{ E_i } \cdot 100 \) (Annual Fuel Utilization Efficiency) \( E_o \;=\; \dfrac{ AFUE \cdot E_i }{ 100 }\) \( E_i \;=\; \dfrac{ E_0 \cdot 100 }{ AFUE }\) |
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| Symbol | English | Metric |
| \( AFUE \) = efficiency | \(dimensionless\) | \(dimensionless\) |
| \( E_o \) = output energy | \(Btu\) | \(kg-m^2 \;/\; s^2\) |
| \( E_i \) = input energy | \(Btu\) | \(kg-m^2 \;/\; s^2\) |
