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Thanks again. I meant that the original model EV was superseded so bought that and fitted it. Confused me as I had the issue before replacing. But will double check. 0.5Bar the manual states so will check that. Will strip it down and make sure no blockages too

Hi Terry, No. When system is off the pressure remains the same. Thanks

Evening all, Have a Glowworm betacom 30 boiler. It’s rather old now and will more than likely have to look at replacing but need to resolve for now. However, wondered if someone could give some advice please? Having high water pressure issues on the heating side but appears to be...