Meaning of boiler horsepower

boil'er horse'power

Pronunciation: [key]
  1. a unit of measurement of the ability of a boiler to evaporate water, usually given as the ability to evaporate 34 lb. (15.6 kg) of water an hour, into dry saturated steam from and at 212°F (100°C).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.