Do thermostatic radiator valves go on flow or return?

Question

One radiator has the pipes coming up differently to the others and I’m not sure if putting the valve on the wrong side will cause problems? Does it matter which way round a TRV is fitted on a radiator?

Steven · Answer

Hi June, most TRVs are bi-directional now. It doesn’t matter anymore which side you put them on. 
Flow and return have to be the right way on most designer radiators though. But the TRV is can go either side

Jack · Answer

Good morning, 

I hope you are well. 

It does not matter which way the TRV is fitted. Either flow or return will work as long as the TRV is a 2 way which most likely is.

Kevin · Answer

TRVs are best fitted on flow as it allows balancing of system. But can be fitted on return.

Richard · Answer

Most modern Radiator Valves are By Directional so it dose not make any difference

Nizam · Answer

For standar radiators TRV's can go on either but it's best practise to fit a TRV on the flow for several reasons.

Dan · Answer

TRV thermostatic red valve should always go on the flow of the radiator when we installed the radiators and pipework we always put the flow on the right hand side but it can be different with different installers

Do thermostatic radiator valves go on flow or return?

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