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Interesting, I've kept a hold of the previous expansion vessell when it was replaced and found not to be the issue so at least I have the spare part, many thanks for your input I was starting to think I needed a new boiler I'd changed that many parts :)

Why two expansion vessels? Is the boiler not fit for purpose?

Sorry meant prv twice and the pressure vessel once

Another vessel? Already been replaced. 4 solutions? Replaced the prv twice and the prv and the heat exchanger what's left

16 radiators. They seem pretty competent, father and son and came recommended. Oretty sure they checked everything around the EV.

Pressure didnt budge over the summer when only hot water, would have had same issues if it was the loop I'd have thought?

Hi, First time poster. We have replaced the pressure release valve, the pressure vessel and the heat exchanger and still experiencing drops on pressure overnight which require a top up to fire the boiler up. No leaks in the system as had thermal imaging survey also no drop of pressure...