It is an important and sometime complex calculation when determining what size radiator is required to heat a room to the correct level. STARS (Stelrad Technical Advanced Radiator System) heatloss calculator offers a simpler way to get sizing of radiators right, first time. Both fabric heat loss and ventilation heat loss is also calculated in order to establish the radiator output and size required.
Stelrad measure output in Btu/hr, British Thermal Unit per hour which is the standard measurement used to state the amount of output of any heat generating device. Heat output can also be measured in Watts, 1 watt is equivalent to 3.412 Btu/hr.