Radiator thermostatic valves

[DARTHVADER]

Hi all,

I have heard that its unwise to have a thermostatic valve on every radiator on a combi boiler, as apparently it can cause problems.

Can anybody confirm?

Thanks,

 

[namsag]

All depends which combi, but with the majority there should be one left off where the roomstat is

 

[JohnD]

you should have at least one rad with no TRV, in the room where your Wall thermostat is.

Otherwise the TRVs might all close down and stop accepting heat, while the wall stat is telling the boiler it needs to run and pump out heat that isn't going anywhere.

You may also need a bypass to take flow from the pump that can't go anywhere.

edited: too slow

 

[kevplumb]

depends on the combi
but the bathroom is usually not fitted with one

so you always have a bypass if the rest close

 

[DARTHVADER]

Thanks to all who replied, the bathroom does not have one fitted.

 

[JohnD]

What about the room where the wall stat is?

 

[DARTHVADER]

It has one fitted John. Does this require changing now to normal?

 

[DARTHVADER]

Can anybody explain the theory behind not having a trv on the room with the stat and whys its unwise?

 

[kevplumb]

room stat is set to say 19

trv closes rad down at 18

room stat is still calling for heat and the rest of the house is like a sauna

 

[DARTHVADER]

Thanks Kevplumb, kinda figured thats what it may have been.

PS what time is it across there?

 

[kevplumb]

1 25 pm and the rain is falling BTW im only a plastic yank i was born in hartlepool

but thats wimmin for ya

 

[DARTHVADER]

So its probably best not to mention monkeys then!!

Its quite nice here (for a change) spring like, up to 14oc but forecast wintry at the weekend.

You should have dragged your American girl over here............NOT!!!

 

[kevplumb]

View media item 147
last train to clarksville i didnt miss it cos it dont move

 

[DARTHVADER]

Aye, that looks like life indeed!! Thanks for your help again, signing off now. Regards.

 

[kevplumb]

no bother