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I have an external flow that is dripping and I believe it is the PRV, it seems quite rare to have a 6 Bar one, in fact the only place I can get a W.B. is on their site for 3 times the price of the usual 3 Bar. Would it be Ok to replace it with the 3 Bar. I have an old Greenstar 30CDI

Hi, my boiler has been little used in the last 2 years but has generaly become less and less reliable. A friend of mine has done some fault diag on it and thinks I need a new gas valve. If I turn the hot water on we get hot(ish) for a minute or so and then it goes cold. If you leave the tap on...