This calculator allows you to convert from Horsepower (boiler) to Calorie (th)/hour and in a reverse direction. To convert from Horsepower (boiler) to Calorie (th)/hour, enter the amount of Horsepower (boiler) into the first input and to convert from Calorie (th)/hour to Horsepower (boiler), enter the amount of Calorie (th)/hour into the second input.