Skip to main content

Plant Engineering Calculator

Condensate Contamination Loss Calculator — Rejected Return, Heat & Water Cost

Estimate the thermal and water penalty when contaminated condensate must be rejected instead of returned to the boiler house.

Inputs

Results

Sensible heat lost 69.77 kW
Annual heat 418600 kWh
Annual rejected water 6000 m³
Combined value $22744

Formula

Q=m·Cp·(Tcond−Tmakeup); annual water=m×hours.

Worked example

Rejecting 1,000 kg/h of 90°C condensate instead of 30°C makeup discards about 69.8 kW of sensible heat.

Assumptions & limits

  • Sensible heat only; flash-steam value is a separate job.
  • Only return condensate when chemistry and contamination controls permit it.

FAQs

What does this Condensate Contamination Loss Calculator calculate?

Estimate the thermal and water penalty when contaminated condensate must be rejected instead of returned to the boiler house.

Is this suitable for final design?

Use it for transparent engineering screening and diagnostics. Verify final design or operating changes against measured site data, OEM curves and applicable standards.

Why are assumptions shown?

Plant calculations depend on operating boundaries. Explicit assumptions make scenarios auditable and prevent false precision.

Related calculators

condensate recovery energy savingscondensate returnboiler makeup water

Last updated: 17 September 2026