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