Trv

[Sanjay29]

Hello, I am about to fit some Trvs.

I have a radiator in the hallway (picture attached) Should I attach a TRV to this radiator even though it’s got a drain valve on it? I think I read somewhere that I shouldn’t put a trv on the radiator nearest the boiler. ( in the garage )

By the way, it is a Combi boiler

Thank you

 

[stem]

Often there is a wired room thermostat located in the hall. If there is one in yours, then a TRV shouldn't be added to the radiator in the same room as well as one device will interfere with the correct operation of the other.

Provided that one radiator, usually the one in the room where the room thermostat is located doesn't have a TRV that will be fine, it doesn't have to be the closest one to the boiler.

 

[Sanjay29]

Thanks.
There is not a wired thermostat in the hall.
There is a portable honeywell cm927 which I will eventually replace with a hive.
So I can put a trv in the hallway ?
Thanks again.

 

[Murdochcat]

You need to make sure that at least 1 radiator does NOT have a TRV

 

[stem]

You need to make sure that at least 1 radiator does NOT have a TRV

Which in your case should be the room where the Honeywell CM927 / Hive is located.

 

[Madrab]

You need to make sure that at least 1 radiator does NOT have a TRV

Why?

So I can put a trv in the hallway ?

The legacy approach used to be where a hard wired stat, as suggested by @stem ,would normally be located in the hall and therefore the hall rad wouldn't have a TRV to stop them fighting each other. These days with wireless roaming stats that can be moved around from room to room then it is impactable to leave off TRV's because of that, therefore the advise is, when a stat is moved into a room that the TRV in that room is always left fully on. Unless of course the wireless stat is then fixed and would not move, then that space would have the TRV head removed (decorators cap loosely fitted)

 

[stem]

If all of the radiators have TRV's on you could end up when the house is warm with all of them closing down meaning there's nowhere for the water to flow from the boiler which may cause it to overheat. Leaving one radiator without a TRV maintains a flow of water through the system at all times.

 

[Madrab]

Hence the use of an ABV - or at worst an internal bypass

Rads being used as an external bypass are no longer the design standard.