2. Remove the old valve Before you can install a new TRV, you need to remove the old valve - whether that be a normal valve or an older thermostatic radiator valve that has seen better days.

For example, a TRV should never be fitted to the radiator in the same room as the wall-mounted room thermostat, as the two thermostats will be fighting each other to gain or deny heat from the boiler.

HOUSEHOLDS are only just realising what the numbers on radiator knobs actually mean. And with energy bills soaring across the UK, using a thermostatic radiator valve (TRV) correctly could potential… ...