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Hot Water Boiler Circulation Rates

Boiler power and water flow - Imperial and SI-units

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The relation between

  • boiler capacity (or power)
  • temperature drop of the water flow in a system serviced by boiler
  • circulated water flow

are indicated in the diagrams below:

Water Circulation - Boiler Capacity in BHP - Temperature drop in degrees Fahrenheit

  • 1 gal (US)/min = 6.30888x10-5 m3/s = 0.0227 m3/h = 0.06309 dm3(liter)/s = 2.228x10-3 ft3/s = 0.1337 ft3/min = 0.8327 Imperial gal (UK)/min
  • 1 hp (English horse power) = 745.7 W = 0.746 kW = 550 ft lb/s = 2,545 Btu/h

Water Circulation - Boiler Capacity in MBtu/h - Temperature drop in degrees Fahrenheit

  • 1 Btu/h = 0.293 W

Water Circulation - Boiler Capacity in kW - Temperature drop in degrees Celsius

  • 1 kW = 3,412 Btu/h = 1.341 British hp

Example - Water flow through Boiler

A boiler with capacity 50 kW increases the temperature of the circulated water with 20oC - the water flow through the boiler according the diagram above is 

0.6 kg/s

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