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