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BlueLoo said: I wonder if your top up line (full mains pressure) being so close the pressure relief line (not an overflow) that one overcomes the other hense the time. Perhaps check the prv outlet when filling. If its flowing, there is your problem. You might try to try filling very slowly, not...

Gentlemen, I have attached a photo of the expansion vessel in the airing cupboard. It appears to have been fitted upside down, with the Schrader valve facing the cupboard floor. Apparently (from my Google searches on this matter), it doesn't matter which way up the vessel is, but do correct me...

@martygturner Thank you for your fast reply. I do bleed the rads while pressurising. I have not added any inhibitor for the past 12 years, fearing that this would contaminate the overhead tank, which also feeds the bathroom cold water. There is no separate tank dedicated to the central heating...

Hello, I live in a two floor semi with a gravity fed conventional gas fired boiler (Potterton Kingfisher MF). The boiler is fed cold water from the loft water reservoir tank (which also feeds the cold water taps in the bathroom). There is an expansion vessel attached to this cold water feed to...