Drayton Wiser Radiator Thermostats - will they fit?

[Ret.phone2017]

Can I fit the Wiser Radiator Thermostats to these TRV valves? I think Wiser require M30 1.5mm valves and I suspect I have Comap M28 1.5mm type. I think I have Westherm 6 TRV's, but I am not sure.

Do I need the following adapters? I hope not given the extra cost!

https://www.heatingcontrolsonline.co.uk/28mm-trv-adaptors-p-386.html


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[denso13]

If you have Comap this suggests you will need adapters https://wiser.draytoncontrols.co.uk/sites/default/files/documents/4369_adapter_guide_2pg_v4_web.pdf

 

[Ret.phone2017]

That's my problem. I don't know what I have. Do I have M30 1.5mm or something different?

 

[denso13]

Do I have M30 1.5mm or something different?

Can't tell that from a photo, you'll need to measure them.

 

[denso13]

The old one does look like a Westherm which means you will need adapters.

 

[Ret.phone2017]

Yes, I think I have Westherm 6. Measuring is difficult, since there isn't a lot between 30mm and 28mm. The inside ring is just 30mm and the outside just over. See photos. Annoyingly I think I have to buy adapters.

 

[Ret.phone2017]

Just received an email from Westherm and they have confirmed it is M30 1.5mm, hence I can fit a Wiser Radiator Thermo without an adapter. The Westherm 6 is also sold by B&Q and Tradepoint under a Regis brand, so I think the Westherm 6 is unusual in their range, since they must have just put their brand on someone else's TRV.

https://www.trade-point.co.uk/new-t...diators/radiator-valves/regis/_/N-wkxZ1z13dsj