Horsepower (boiler) to kilocalories per hour conversion calculator above calculates how many kilocalories per hour are in 'X' horsepower (boiler) (where 'X' is the number of horsepower (boiler) to convert to kilocalories per hour). In order to convert a value from horsepower (boiler) to kilocalories per hour (from hp to kcal/h) simply type the number of hp to be converted to kcal/h and then click on the 'convert' button.