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Not a terribly intelligent or constructive contribution there, kev. Re-pressurised my own system today following moving 2 rads...boiler over-pressure valve blew at 2.1 bar. 1.5 or 2... who cares.? My point is that he shouldn't be afraid to drain and then re-pressurise his system... his...

Hi Sounds to me like you don't know where your filling loop valve is - ie, you've never had to refill or top up... ?? Somewhere on your system you will have a manual valve connecting your rising main to your central heating circuit - this is how you refill your system if you have drained it...

Thanks guys, this is helpful. I suppose the more I think about this, the more I conclude that the flow rate should be constrained by the most restrictive part of the pipework end-to-end... that is, if there's already a 15mm section then I will not lose any flow by extending that section...

Hi List - I need to get a run of pipe from where the (hot water, 22mm) supply emerges at ceiling height, down a wall, to meet the exit point which is a stub of 15mm copper pipe at floor level leading through the wall to the kitchen beyond. The run, from ceiling to floor level, is about 3...