Thermostatic radiator valve

The valve gradually closes as the temperature of the surrounding area increases, limiting the amount of hot water entering the radiator.

As the valve works by sensing the temperature of the air surrounding it, it is important to ensure that it is not covered by material (such as curtains).

The central heating boiler would continue to run in an attempt to reach the room thermostat set temperature, potentially heating the rest of the house to uncomfortably high levels if TRVs are not installed on the radiators in every room.

Some electronically controlled valves run on batteries which must be changed at regular intervals, while others can be connected to the power grid.

Electronically controlled variants may also require additional setup, for example by connecting to a mobile phone application through a smart home hub using wireless protocols such as Zigbee or Z-Wave.