ClueLuma

Required water flow (GPM) calculator

Required water flow is calculated as q / (500 × ΔT). Use the stated system boundary and matching input units.

Units
GPM=q500×ΔT\mathrm{GPM} = \frac{q}{500 \times \Delta T}

Calculator

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

Btu/h
°F
gpm

Worked example

Given

  • qq = 600,000 Btu/h
  • ΔT\Delta T = 12 °F
GPM=600,000500×12=100\mathrm{GPM} = \frac{600{,}000}{500 \times 12} = 100

Symbols and units

SymbolMeaningUnit
GPM\mathrm{GPM}required water flowgpm
qqwater-loop heat rateBtu/h
ΔT\Delta Twater temperature change°F

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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.