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Thanks gaswizzard, There is a cold water storage cistern in the attic. Could it be possible that there are some cold water outlets that use mains AND others that use the cold water cistern? If so then might there be a dodgy mixer valve/tap feeding cold water back up the hot water pipes, thus...

Thanks Dan, Is it not likely that the current cylinder can be fixed? A new one is expensive... Thanks

I have a leak from my cold water tank in the attic when water has not been used recently, and no hot water. The ball valve seems fine. I have another smaller hot water tank that is higher up than the main tank. I'm guessing that the hot water tank is leaking back into the main tank...