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Hi All Many thanks for your replies - really is appreciated, especially so soon after posting! Been busy checking some of the things you've mentioned. I got a 12L Expansion Vessel and this said it came pressurised at, and only should be pressurised to, 1 Bar. I checked it though before...

Hi Tony Thanks for your prompt reply! Yes, it is "me". Dad was a plumber and fully certified installation engineer and taught me quite a bit from my early teens about central heating systems and general plumbing. (But he's passed away so can't help now.) Also, with the move, we are very...

Hello I've just moved into a new house with a Grant 90 Combi Mk2. Noticed there was some pressure loss over a day or two, maybe 0.2-0.4 bar, so topped up and bled radiators. No losses anywhere else in system, or at least that I can find. Still gradual loss continued. When we started...