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Not sure, how could I check that? (work in IT, not heating, sorry!)

Bit more info. I noticed after posting that my boiler temp was still on 'summer' setting (about number 5 to 6 out of the 14 dots on the temp scale), so I turned it up to about 8 and put the CH back on manually. Whine lasted longer and seemed to have more vibration in addition to the whine. So...

Hi, Our house has a Suprima 60 boiler, approx 10 years old. Had a problem last year where the boiler made a sound like a jet taking off every so often when CH was on. The Scottish Gas engineer (we're on Homecare) replaced the pump and this stopped the problem. Since the summer, had a...

Hi, just a quick update as I hate it when folk ask for help then you never hear back how they got on ;) part 2 1/2in High pressure valve and ball successfully fitted today, washers and tape used for good measure. Leak free, so far :) thanks for all the help gents, I would have been...

That's great, thanks for confirming it. Off to B&Q tomorrow, methinks!

Pics uploaded to the original post (inc one of the 'brown matter' in the bottom of the cwst! and one with tape measure to - hopefully - show size) Thanks for all the really quick and detailed advice, I appreciate it :D In answer to comments; I tried an in-place repair but the cap on...

Hi, The ball valve is slightly leaking in the loft CWST, so the overflow eventually starts dripping if we are not using the bathroom taps or flushing the loo. I'm comfortable enough with the concept of replacing it, but just want to confirm about sizing and the existing valve's connection...