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The 3 bar relief valve has sorted it but as you say not the best approach, but at least the system is within the limits now. Can't understand why it is just the hot tap that causes it, to me suggests the boiler is causing it somehow. We have a boiling water tap (Qettle) which states a max of 5...

I don't think this is a CH problem as we never have the heating on overnight, we switch it on manually so pipes are not warm etc in the morning. I think it's solely back pressure from the boiler when the hot tap is turned off quickly and I just assumed it happened overnight. The pressure drops...

https://www.screwfix.com/p/honeywell-home-pressure-reducing-valve-1-5-6bar-15mm-x-15mm/7978j That's the prv which is installed straight after the stopcock, the relief valve is installed after the prv outside about 1 meter after in the car port just above a drain. Just had a mate here who is a...

I've actually found just turning the hot water tap off quickly causes the pressure to remain high @ 8 bar. Its possible this is the issue as the other half wouldn't notice if it was too high before going to bed. I can't understand why the relief valve isn't kicking in though as that is rated @ 6...

I did have a 'predator' trv from screwfix but changed it to a Hollywell I think as I assumed that that was the issue. If they are only suitable up to 6 bar is there a different one that would suit? If I get an Expansion Vessel is there a specific place it has to be fitted?

I have tried contacting water board they said if its too high its my responsibility. I'm guessing boiler operating pressure has a limit not sure what atm.

Hi all, A while back we had an issue with our boiler that was covered under warranty. The engineer that fixed it said our mains water pressure was too high and recommended a PRV to be fitted. I bought a gauge and it was reading 13bar, so I fitted a PRV just after the stop cock and set it to 5...