Boiler Feed Pump GPM Calculator

This boiler feed pump calculator estimates the flow required for boiler feed systems using the standard Burks sizing method. Enter boiler horsepower and the calculator will estimate the gallons per minute needed for proper pump selection.

Burks sizing uses boiler horsepower and a safety ratio to estimate required feedwater flow. This gives a quick starting point when matching a pump to a boiler feed or condensate return application.

Burks sizing formulas

For smaller boilers, the Burks method uses a higher safety factor. Larger boilers typically use a slightly lower ratio because the systems operate more efficiently.

• Boilers 1–75 BHP: 3 to 1 safety ratio → BHP × 0.231
• Boilers above 75 BHP: 2-1/2 to 1 safety ratio → BHP × 0.192

This method provides a quick estimate of the flow required before selecting a pump or receiver package.

Example calculations

50 BHP Boiler:

50 × 0.231 = 11.55 GPM

100 BHP Boiler:

100 × 0.192 = 19.20 GPM

After determining the required flow, compare the result to available Burks pumps, Burks pump parts, or complete condensate return systems.

Pressure and head conversion

Pump selection also requires understanding system pressure and head requirements. If you need to convert system pressure into pump head, use the PSI to feet of head calculator.

Common applications

• Boiler feed pump sizing
• Boiler replacement pump selection
• Condensate return system design
• Steam boiler equipment planning
• Boiler room pump upgrades

This calculator provides a quick engineering estimate based on Burks sizing formulas. Final pump selection should always be confirmed against system head requirements and manufacturer pump curves.

For general boiler and pump reference information, see Engineering Toolbox.