ClueLuma

Annual cost of a stated useful heating rate calculator

Useful thermal output becomes purchased fuel input after division by heater efficiency.

Units
C=Q×H×cfηC = \frac{Q \times H \times c_{f}}{\eta}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Btu/h
h/year
$/Btu
fraction
$/year

Worked example

Given

  • QQ = 36,000 Btu/h
  • HH = 2,300 h/year
  • cfc_{f} = 0.000015 $/Btu
  • η\eta = 0.83 fraction
C=36,000×2300×0.0000150.83≈1,496C = \frac{36{,}000 \times 2300 \times 0.000015}{0.83} \approx 1{,}496

Symbols and units

SymbolMeaningUnit
CCannual heating cost$/year
QQuseful heating rateBtu/h
HHannual hoursh/year
cfc_{f}fuel-energy price$/Btu
η\etaheater efficiencyfraction

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Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.