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