Which rooms for TRV fitting?

FlaatusGoat

Where should I fit TRV's please? Downstairs measures about 8m X 4m and is all open plan (kitchen and living room) there's two radiators one by the staircase and another larger unit at the back wall on the other end of the room. Upstairs I have two bedrooms and I've fitted TRVs in those rooms. The bathroom which is in-between the bedrooms I've left with a lock shield. I may convert that rad to a towel rail one.

I hasten to add I'll be mainly leaving the thermostat downstairs thanks

FreeBear

One would normally place the thermostat in a central location in the house, and the radiator heating that space would not have a TRV fitted. Traditional thinking would have the bathroom radiator acting as a bypass/thermal dump so wouldn't have a TRV. But modern boilers will (usually) have an internal bypass and enough smarts to shut down when getting too hot so don't need a thermal dump - I have a TRV on the bathroom radiator, but not in the hallway where the thermostat is located.

Some modern installations utilise smart TRVs, multiple temperature sensors, and can effectively zone each room - An expensive option that takes time to configure and tune.

As for swapping the bathroom radiator for a towel rail - Do your heat loss calculations and factor in lower flow temperatures. Many towel radiators don't kick out much heat, so you may need a big expensive one to keep the bathroom warm.

DullGreyGuy

My understanding was always that you dont put them on the radiators in the space with the thermostat else it wont work and you do put them in any room you may want to have cooler than the space with the thermostat. 

If your thermostat is somewhere hot in your home then this may not work so well but then the solution really should be to move the thermostat rather than trying to reduce the heating in that room so that your cold lounge gets to the temp you want.