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Yes, I know. I explained it before but not sure if it was this thread. I have Tado smart sensing heads. The TRVs (the actual valves) are a model that needs an adaptor for the Tado sensing head to screw onto. So I want to replace with a model that doesn't need an adaptor (a Drayton RT212 with an M30 x 1.5 thread). Plus, the bedroom one is leaking a drop or two of water every time the plunger/pin is actuated.
Eventually all the TRVs in the house will be replaced. But the leaking one is a priority and the other two on that floor don't have rads connected (plastering/decorating those rooms), so I'm taking advantage of A) not having to bleed those radiators, and B) the system being drained down past that point to deal with the leaky one anyway, to get all three changed.
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stevo_com
NotThamesWater
Re the changing the trvs- you know the top of them just unscrews right, and you can replace the trv head and leave the valve as it is?
That's no use to you if the valve is stuck i appreciate but if the pin in the trv is stuck or broken and you can't turn the rad up or down,you can just buy the replacement trv head from screwfix or whatever and replace it yourself without getting wet.