Convert Boiler Horsepower to Electrical Horsepower
Convert Boiler Horsepower (BHP) to Electrical Horsepower (hp(E)) instantly and accurately.
Conversion Formula
hp(E) = BHP × 13.15087677
About Boiler Horsepower
One boiler horsepower (BHP) ≈ 9,810 W = 33,475 BTU/h - the power to evaporate 34.5 lb of water per hour at 212°F, standardised by ASME for rating steam boilers. A small office building needs 10-50 BHP; a hospital or large plant 200-2,000 BHP. Critically, 1 BHP is ~13.1× larger than 1 mechanical horsepower (746 W) - a dangerous confusion when specifying heating equipment. 1 BHP ≈ 9,810.6 W.
About Electrical Horsepower
The electrical horsepower (hp(E)) is defined as exactly 746 W - the US NEMA rounding used on electric motor nameplates. It differs from mechanical hp (745.7 W) by only 0.04%. Every NEMA-rated motor in the US carries a horsepower nameplate: a '5 hp motor' delivers 5 × 746 = 3,730 W. NEC motor branch-circuit sizing tables, overload relay selection, and starter ratings are all based on hp(E). Despite global kW adoption, US industrial motor infrastructure remains standardised in electrical horsepower. 1 hp(E) = 746 W.
Quick Reference Table
| Boiler Horsepower (BHP) | Electrical Horsepower (hp(E)) |
|---|---|
| 1 BHP | 13.1509 hp(E) |
| 2 BHP | 26.3018 hp(E) |
| 5 BHP | 65.7544 hp(E) |
| 10 BHP | 131.509 hp(E) |
| 25 BHP | 328.772 hp(E) |
| 50 BHP | 657.544 hp(E) |
| 100 BHP | 1315.09 hp(E) |