Convert Boiler Horsepower to Calories per Hour
Convert Boiler Horsepower (BHP) to Calories per Hour (cal/h) instantly and accurately.
Conversion Formula
cal/h = BHP × 8435558.103
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 Calories per Hour
One calorie per hour (cal/h) equals exactly 0.001163 W - the rate of transferring one thermochemical calorie (4.1868 J) per hour. A resting adult generates ~70-80 W ≈ 60,000-70,000 cal/h of heat. The unit appears in European and Asian HVAC standards for small-appliance heat loads and in laboratory calorimetry reporting metabolic activity of small organisms. Calorimetric enzyme assays also express catalytic heat in cal/h per unit enzyme. 1 cal/h = 0.001163 W.
Quick Reference Table
| Boiler Horsepower (BHP) | Calories per Hour (cal/h) |
|---|---|
| 1 BHP | 8435560 cal/h |
| 2 BHP | 16871100 cal/h |
| 5 BHP | 42177800 cal/h |
| 10 BHP | 84355600 cal/h |
| 25 BHP | 210889000 cal/h |
| 50 BHP | 421778000 cal/h |
| 100 BHP | 843556000 cal/h |