Thermostatic radiator valves

somewhereweknow

Does anyone have knowledge of these valves?

My last house didnt have thermostatic valves and new one has Myson TRV 2 way valves, need to understand them before the heating comes on !!

When the house thermostat is on zero the radiators still come on (if switched on), and if i want any of the rooms cooler or warmer i have to run round and adjust each radiator - just wondering if this is usual?! :huh:

Also, if i turn the radiators off in a couple of rooms in the house we don't use will it be cheaper or does it cost as much to heat as the water has to get to the radiator before being 'told' by the radiator that it's off??

Thanks

mikey72

Leave then set at 3 out of 5, or 6 out of 10 normally.
When the room heats up they're start to close automatically, and reduce the flow through the radiators, so the radiators will feel cooler, but not cold.
Don't turn them fully off though.
Leave them on 1 or * and they'll stop the room freezing in winter.


http://www.whitesplumbing.co.uk/pdfs/Myson%20TRV.pdf

somewhereweknow

mikey72 wrote: »

Leave then set at 3 out of 5, or 6 out of 10 normally.
When the room heats up they're start to close automatically, and reduce the flow through the radiators, so the radiators will feel cooler, but not cold.
Don't turn them fully off though.
Leave them on 1 or * and they'll stop the room freezing in winter.


http://www.whitesplumbing.co.uk/pdfs/Myson%20TRV.pdf

Thanks . On that link it says each setting on the radiator has a set temp, so presumably it doesnt make a blind bit of difference whether the house thermostat is set to zero or 30??

mikey72

There's were it goes a bit astray.
The house thermostat controls the boiler, set too low and nothing comes on, set too high and the radiators all shut down, and the boiler keeps trying to pump and heat.
Normally the house thermostat is put in a room/hall where there is no trv, and when that room gets to temperature, the boiler turns off. Usually it's set a few degrees higher than the trvs.
Also, the bathroom usually has no trv, so even if the rest shut off, the water still has somewhere to go, and the boiler doesn't overheat.

MX5huggy

If you do have a TRV on the rad in the room with the thermostat then that TRV should be set on the highest setting so in effect the boiler turns off before the room exceeds the temp set by the TRV.

womble12345

mikey72 wrote: »

The house thermostat controls the boiler, set too low and nothing comes on, set too high and the radiators all shut down, and the boiler keeps trying to pump and heat.

I have also moved into a house with the same kind of system so this is all useful stuff.

I can understand why you say 'set too low and nothing comes on' but why do you say 'set too high and the radiators all shut down', why is that?

Thanks

MX5huggy

womble12345 wrote: »

I have also moved into a house with the same kind of system so this is all useful stuff.

I can understand why you say 'set too low and nothing comes on' but why do you say 'set too high and the radiators all shut down', why is that?

Thanks

Because if all the rads are set to 3 which is about 18C and the thermostat is at 25 then the rads will shut down leaving the boiler only heating the circuit pipe and any rads without TRVs.

macman

Set the main house temp with the room stat, then adjust local temps with the TRV's, i.e. most people like a warmer lounge and cooler bedrooms.

Canucklehead

By far the best source of accurate internet advice on heating and hot water is here.

Canucklehead

mikey72

Canucklehead wrote: »

By far the best source of accurate internet advice on heating and hot water is here.

Canucklehead

I find that's a quite badly laid out and badly written website.
The answers seem like they were written in a quasi technical language, to make it just too complicated for the man in the street, so they think they need to get someone in.
Everything has been said on here, just in english.

Canucklehead

mikey72 wrote: »

I find that's a quite badly laid out and badly written website.
The answers seem like they were written in a quasi technical language, to make it just too complicated for the man in the street, so they think they need to get someone in.

I have to disagree. The OH's customers (and other MSErs) have commented on the usefulness of the Heating and Hot Water Industry website (HHIC) in particular its advice library where you can ask a question, the manual links and section on the Benchmark scheme. Unfortunately internet forums are often rife with poor (sometimes dangerous) and money costing advice.

Off topic, but an excellent source on all things bathroom related is here,in particular here.;)

HTH

Canucklehead