Plant engineering calculator · Updated 17 September 2026
Condensate Pump Sizing Calculator — Design Flow, Head & Motor kW
Size a condensate return pump from return flow, pickup factor, static head, friction/pressure allowance, density and efficiency. Returns design flow, TDH and input power.
Inputs
Live results
- Design pump flow 15 m³/h
- Total dynamic head 20 m
- Hydraulic power 0.77635979 kW
- Estimated input power 1.1090854 kW
Formula and method
Qdesign=Qreturn×factor; H=Hstatic+Hloss; Pin=ρgQH/η.
Worked example
A 10 m³/h return at 1.5 pickup factor is screened at 15 m³/h design flow.
Engineering assumptions and limits
- Head allowances must reflect the actual piping and destination pressure.
- Check hot-condensate NPSH available separately before pump selection.
Frequently asked questions
What does this Condensate Pump Sizing Calculator calculate?
Size a condensate return pump from return flow, pickup factor, static head, friction/pressure allowance, density and efficiency. Returns design flow, TDH and input power.
Can I use this for final equipment selection?
Use it for transparent engineering screening. Final selection must be checked against vendor curves, operating envelopes, applicable standards and site measurements.
Why are intermediate results shown?
They expose unit conversions and governing loads so unrealistic assumptions are easier to catch.