Thermostatic valves

[John1954]

Can anyone please tell me if thermostatic valves should be fitted to the flow or the return. on a combi vaillant boiler. as I uderstand it should be the flow.
I have found 8 of mine are fitted to the return...

 

[Armo74]

Preferably on the flow but some are bi-directional they should have arrows on the valve body for direction of flow.

 

[John1954]

Thanks for that ,yes mine are bi directional, but I would prefer that they are fitted on the right configuration.
Many thanks for your reply

 

[D_Hailsham]

Thanks for that ,yes mine are bi directional, but I would prefer that they are fitted on the right configuration.

Don't waste time (and money) moving them to the other end. It doesn't matter which end they are on: all they are doing is adjusting the flow through the rad; and what goes in is the same as what comes out.

Some argue that a TRV is better on the return as the lower water temperature has less effect.

 

[rjm2k]

As they say, if it aint broke, don't fix it!

 

[John1954]

Thanks for all your replys, I will leave well alone then