Thermal power values of the all other heights are still to be tested. Characteristic Equation: f=Km?tn. Thermal power values measured at the Milan Polytechnic in accordance with the EN 442 norm. In order for the radiator to function correctly, it is recommended that you use an automatic valve with an air vent and that you never isolate the battery from the installation by closing its valves. Also remember that the guarantee is valid as long as the installations working preassure does not exceed 20 bar. Maximum working temperature: 120°. Hub Ø: 1"