Thermostatic Valves (TRVs)

Thermostatic Radiator Valves (TRVs) are often fitted to radiators to give a more responsive control of the radiator heat output according to the air temperature in the room. The head of the TRV has a sensor which responds to the air temperature around it. When the sensor expands on warming, it pushes against a pin which closes the valve.
These are connected to a radiator to control the flow of hot water into the radiator. As the room heats up to a preset temperature, the valve will gradually close reducing the amount of heat given out. As the room requires more heat, the valve opens allowing more hot water in to the radiator which gives out more heat.
Fitting thermostatic radiator valves will allow you to control the temperature accurately in each room where they are fitted. This can save considerable amounts of energy and cost by preventing some rooms in your home from becoming overheated. The valves will soon pay for themselves in savings made on heating costs.