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Thanks Michele. As mentioned above I have already checked the expansion vessel and although it was empty, I recharged it and it seems to be holding the charge since, but the problem persists, so I guess PRV is the next thing.

As a little update, I did some experimenting this afternoon. I noticed that if I deliberately overfill the boiler to 3-4 bar pressure, the system spits a load of water straight out of the overflow, and eventually settles at around 1.5 bar. As I understood it the PRV is supposed to release at...

Hi all, This is my first post to the forum but I have lurked for a while and would like to thank everyone for their helpful comments. I have a Remeha Avanta condensing boiler that rapidly loses pressure and requires topping up every few days. I have checked the house all over for leaks...