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Swapping a manual radiator valve for thermostatic.

View the thread, titled "Swapping a manual radiator valve for thermostatic." which is posted in UK Plumbers Forums on UK Plumbers Forums.

Hi, I hope this is the correct place to ask this.

I've been given a bunch of smart TRV's to put on my radiators at home. Mostly they've gone on fine (to these valves)

DESIRED VALVE.jpeg

but 2 of my radiators have the manual valves shown in this image:

CURRENT VALVE.jpeg

My question is, can I just remove that core and replace it with one of these:

Screenshot 2022-11-27 at 13.49.58.png

to have them act as a TRV, or do I need to replace the whole unit?

Let me know if I need to give any more information to answer, and thanks in advance for any help.
 

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By the time you drain down, remove the valve bonnet, only to find the new threads are different or diameter different, it would be easier and safer to replace the valve.

The only common thing with radiator valves are the inlet and outlet threads. Anything inbetween is not common.
 

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