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Thats brilliant! Thank you Harry! How thoughtful of the forum Webmasters.

@BlueLoo Please continue going out on such limbs! I'm calling it a night as far as loft expeditions are concerned. Last thing I need is to fall down between the floor-boards a couple of hours from midnight. But tomorrow is another day and I'll definitely trace the pipe.

Harry said: I would doubt that, unless there is a big height difference between the pressure gauge and the water level, in your tank. Easy way to trace that pipe, would be to have someone tap it gently, whilst you try to trace it. Thank you Harry. I too was wondering what could be changing in...

Which NR valve are you talking about Terry? Please mark it if it appears in one of the photos which I've uploaded. EDIT: Trace the source of the plastic pipe that connects to the isolation valve. I have. Read the 1st paragraph on past #23, the source is the Loft tank. The Isolation valves (there...

terryplumb said: You have a complete misunderstanding of your plumbing set up. At...

Here we go: IMG_8349 is a photo of the front of the plastic loft water tank (coffin), showing three of the four connections to it. The Uppermost inverted L shaped PVC pipe lagged on its vertical section, is the cold water mains feed. This enters the tank through its left square top hatch. The...

Harry asked: Has he fed actually fed it from the loft tank, or maybe he fed it from the cold water feed to the tank? I'm not sure. I'll go up to the loft & check.

terryplumb said: Is the silver coloured braided flexible hose in your pic severely bent downward,close to where it meets the red expansion vessel...

Could you post pics of your airing cupboard showing your cylinder, filling loop and expansion vessel? You read my mind BlueLoo! I have just returned from doing so. Please find attached. What I cannot understand is this: From what I've read on line, the expansion vessel (EV) is normally...

BlueLoo said: So either, you have a massive leak (you don't because your pressure would drop instantly) or, what you think is happening when you top up, isn't. I can only think that the mains water is ****ing out of the PRV or back filling up this tank in the attic (past overflow?). Or you have...

@polesapart Thank you. I quite agree that the installation isn't a pretty sight - the installing plumber was a Checkatrade man, and came highly recommended. This same man, banged into the rusted steel loft tank, and managed to make a penny sized hole in it, water seeping down, wallpaper &...

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...