what is the us customary units for power
Units of power. The two most commonly used units of power in the United States customary units are mechanical horsepower and Btu/hour. The watt, an SI metric unit of power, is also widely used. The boiler horsepower is the rate of energy required to evaporate 34.5 lb (15.65 kg) of water at 212 Â°F (100 Â°C) in one hour. It is a rarely used unit.