Is it full of water and connected with pipes or is it empty and redundant ( if it is too large to get through the hatch redundant tanks often get left in the loft )
There is only one thing that comes to mind regarding the splurting water from the taps which then settles down only to repeat later - "The combi pressure vessel is somehow involved"
Bernard, I think it still has water in it. It is large. In the cupboard where the cistern was, there is a large down pipe with a red turning thing - on and off knob/stopcock? - that is cut off below the red thing. There are two further down pipes that are cut off and one that goes down to lower floor (to where I do not know). SO, I am assuming it is redundant. Is that any help?
Ideal would normally only verify their boiler is working o.k - the system pipework and associated equipment needs a thorough check over by a fully experienced skilled tradeserson.
I very much doubt its a boiler problem, when vented systems are changed to combis not all installers cut out the unneeded pipework and leave deadlegs (unused but still connected pipework) I would hazard a guess that you have a large deadleg somewhere on your pipework causing the problem.
Unless the "pressure vessel" is an accumulator to boost the cold water supply it is unlikely to be involved with pressure variations on the cold water supply
I agree that dead legs are a possibilty, with air trapped in a vertical dead leg you have an unwanted "pressure vessel". If the installer has left a tank of water with redundant p[ipes still cnnected then heaven knows what else is there.
Ooh. Now I think we are on to something! All this time, I have been asking 'Why now ?' There are several 'deadlegs', as you call them, in the cupboard where the cistern was. I am using this space as an airing cupboard now. Some time ago a duvet caught on one of the deadlegs and pulled it. I remember thinking, 'I hope that hasn't damaged something' and pushed the deadleg back into position. Do you think I might have torn something slightly off whatever it was joined to in the ceiling and caused air to get into the system? Or am I completely off the mark here?
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