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# Hot Water Boiler - Circulation Rates

## Boiler power and water flow - Imperial and SI-units.

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

## Related Topics

• Heating - Heating systems - capacity and design of boilers, pipelines, heat exchangers, expansion systems and more.
• Combustion - Boiler house topics, fuels like oil, gas, coal, wood - chimneys, safety valves, tanks - combustion efficiency.

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Temperature

oC
oF

Length

m
km
in
ft
yards
miles
naut miles

Area

m2
km2
in2
ft2
miles2
acres

Volume

m3
liters
in3
ft3
us gal

Weight

kgf
N
lbf

Velocity

m/s
km/h
ft/min
ft/s
mph
knots

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O

Flow

m3/s
m3/h
US gpm
cfm

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