What are thermostatic and manual radiator valves?
Thermostatic radiator valves
Thermostatic radiator valves, known as TRVs, cut off the flow of water to a radiator automatically when a set maximum temperature has been reached.
They turn the flow of water back on again when the radiator begins to cool.
They are available in many sizes and configurations - straight, vertical angle and horizontal angle - to suit various situations.
The temperature is set on a dial on the thermostat.
The automatic switching off of individual radiators can save money on your heating bills.
Manual radiator valves
A manual radiator valve has to be turned on and off by hand.
Most central heating systems have at least one radiator fitted with a manual valve.
This is to ensure there is still somewhere for the hot water to flow to and from if all the thermostatic valves are off at the same time.