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Plant Engineering Calculator

Updated Sep 17, 2026

Boiler Feedwater Heating Duty Calculator

Calculate sensible feedwater heating duty, annual thermal energy and steam-equivalent heating load.

Live calculationWorking shownPrivate in browser

Inputs

Results

Feedwater heating duty 697.67 kW
Steam-equivalent heating 1141.64 kg/h
Annual thermal energy 4186000.00 kWh
Temperature rise 60.00 °C
More actions

Shared links reopen these inputs. Recent and saved calculations stay in this browser unless you clear site data.

Formula

Heating duty = mass flow × Cp × temperature rise; steam equivalent = duty ÷ latent heat.

Your calculation, step by step

These steps use the values currently entered above so the result can be checked independently.

  1. 1.Formula: Heating duty = mass flow × Cp × temperature rise; steam equivalent = duty ÷ latent heat.
  2. 2.Substitute: Feedwater flow (kg/h) = 10000; Inlet temperature (°C) = 30; Outlet temperature (°C) = 90; Water Cp (kJ/kg·K) = 4.186; Hours/year = 6000; Steam latent heat (kJ/kg) = 2200
  3. 3.Primary result: Feedwater heating duty 697.67 kW

How to use this calculator

  1. Enter measured or design values using the units shown beside each field.
  2. Review the live results and the substituted calculation steps before using the estimate.
  3. Check the assumptions below, then continue to a related calculator when the next engineering decision needs another model.

Worked example

A 10,000 kg/h feedwater stream heated from 30°C to 90°C needs about 698 kW of sensible heating duty when Cp is 4.186 kJ/kg·K.

Assumptions and limits

  • Uses a constant water Cp entered by the user.
  • Steam equivalent is an energy screen; final heater design requires steam-table enthalpies, drain and subcooling checks.

How to interpret the result

Treat the primary result as an engineering screening value, then use the secondary outputs to understand scale, energy or operating impact. Confirm site measurements, equipment limits and applicable standards before making a design or control change.

Questions engineers ask

Does this replace a feedwater-heater heat balance?

No. It screens sensible heating duty. A detailed heater balance should use actual inlet/outlet enthalpies and steam/drain conditions.

Why show steam-equivalent heating?

It converts the sensible duty into an approximate steam mass rate using the entered latent heat, which is useful for early utility screening.

Continue the calculation

Use the next calculator in the same engineering workflow instead of restarting from search.

boiler efficiencycondensate energy recoveryboiler makeup water
Methodology. MAXScanner shows the governing formula, entered values and calculation outputs so the estimate is auditable. The calculator is a screening aid; assumptions and equipment-specific limits remain part of the engineering review.