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Thanks kevplumb, a bit slow of me there. I have a friendly local corgi engineer who has done some work for us in the past and have given him a call to come and have a look.

Thanks Brumylad, but I have tried that, all the rads appear to be fine. Also if it was air caught in the system expanding then I guess you would expect the water in the F&E tank to be hot or at least warm when it is up to the overflow but apart from one occasion (see below) the water is...

I've just had a look and realised that even if I tie up the ballcock the drip doesn't stop. I might have to have the mains off for days to see if it makes a difference not practical I'm afraid :( If it is a split coil shouldn't my cold water storage tanks, which are mounted below the F&E...

I guess if I tie the ballcock up that would be sufficient otherwise my mains could be off for a while. I will try the above and come back when I have an answer. Out of interest if it does continue to fill up (ie it isn't the drip from the ballcock) what do you think the likely cause might be :?:

I tried this earlier today. Unfortunately the feed from the cylinder is at the top so when you have stoped any water feeding into the cylinder there is no pressure to force the water out. Therefore when you run the hot taps you get very little water (just what is in the pipes) before they...

I have a gas fire CH system incorporating a gravity fed HW circuit with my F&E tank located in the loft above the main water storage tanks. The level in the F&E tank keeps increasing over a period of roughly 2 weeks (could be shorter) at which point it overflows. The water in the F&E tank...