Radiator Thermostat is installed onto a Thermostatic Radiator Valve Body (TRV body). The combination of both, the Thermostatic Radiator Valve (TRV), controls the room temperature by adjusting the flow of hot water through a radiator. The temperature of different rooms is controlled individually and energy is saved. TRVs are installed in water-based heating systems on the supply or, less commonly on the return connection of radiators. With specially designed (normally closed) valves, thermostats are sometimes also used in water-based cooling systems to control individual cooling circuits. Thermostats of this type are particularly suitable for underfloor convectors and enclosed radiators. Honeywell Home radiator thermostats with Honeywell Home (HW) M30 x 1.5 connection are suitable for all TRV body and radiator inserts with M30 x 1.5 connection and 11.5 mm closing dimension.