what is btu output
A British Thermal Unit (BTU) is an approximation of the amount of energy required to heat 1lb (one pound) of water from 39Â°F to 40Â°F (degrees Fahrenheit), and is roughly equal to 1.055 KJoules.Simplified, 1 BTU is roughly the amount of heat produced by burning a single wooden match.TUs are âBritish Thermal Unitsâ, the unit in which radiator efficiency is measured. Factors such as room dimensions, window size and wall material are used to calculate the required outputs of radiators, in order to adequately heat a room.