Definitions for

**"BOILER HORSEPOWER"**A measure of the maximum rate of heat energy output of a steam generator. One boiler horsepower equals 33,480 Btu/hr output in steam.

A unit of rate of water evaporation equal to the evaporation per hour of 34.5 pounds of water at a temperature of 212 degrees Fahrenheit into steam at 212 degrees F.

The equivalent of heat required to change 15.6 kg (34.5 lb) per hour of water at 212'F I OO'C) to steam at 212'F (I OO'C). One BHP equals 9.81 kW (33,479 Btu/h).