What are TRV’s?

The TRV is a self-regulating valve that works by changing the flow of hot water into a radiator. If it gets too warm in the room the capsule in the valve head expands causing the pin to close the valve therefore slowing the movement of hot water into the radiators. On the other hand, if the room temperature drops the capsule contracts pulling the pin out increasing the flow of hot water into the radiators.

Having TRV’s can improve comfort, convenience and energy efficiency by providing temperature control for individual rooms. Adjusting the setting of TRV’s in different rooms can ensure rooms that are not in use are not being heated unnecessarily by selecting the lowest temperature setting to keep the chill off without wasting energy. They can also help avoid overheating individual rooms whilst allowing the heating system to maintain other room temperatures.

There are two places that you really shouldn’t install TRVs on the radiators – the first is in bathrooms. This is because the heat produced by the bath/shower will cause the TRV to shut off (it will cause the capsule to expand), this isn’t ideal when u want to step out of a nice hot shower into a warm room.

We also don’t advise installing a TRV in the same room as your main heating thermostat. The main thermostat will link directly to the boiler, firing it up or turning it down, so by having a TRV in that room they will fight for control – if the TRV wins, the heating in your house will go off!

TRV’s can range from £10-£30 each plus labour. Please contact for more information or a free quotation.