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