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That'll be why then :-) When I looked in the loft I have three tanks. One without 'ballcock' and two with. The big one (where the water comes in and has a 'ballcock') has a pipe that feeds into top of it (its u shapes so its not an overflow for the tank .... more that you would except water...

Re condensate pipe, I looked into this online and it appears to be a pipe from the back of the boiler to the outside. I checked and I can see such a pipe coming out of the back of the boiler and outside. Mark

Hi Its a Baxi Solo 2 50 PF. I checked to see if there was anything coming out of the overflow outside but nothing there when the sound was heard. Mark

Thanks. Someone else suggested it might be air escaping into the 'header tank' Excuse my ignorance but how do I know where/what my condensate pipe is?

Hi I know this sounds odd but when the boiler (central heating) goes off, about 10 minutes after I hear what sounds like a flushing sound come from the back of the house (somewhere near where the boiler is). I sounds like a bucket of water is being poured out a window ... a strange sound...