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Don't know. The boiler is quite loud when I put the hot water on. However, when I put the heating on the boiler goes to nearly 2 bar - perfect. Of course it goes back down again when the water cools. Does this give any clues as to whether there is a lack of water in the system? or it is...

I'm sorry to post yet another loss of pressure question - however, I would appreciate any advice that could be given. We have a Vailant Combi Boiler. About 3 months ago we noticed a fluctuation in pressure. We called Br Gas who said that the pressurisation vessell needed re-pumping - they...