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I've owned the house 10 years, but I think it was build in 1999, so getting on a bit now. It could be the valve topping up, strange it's started getting noisy, might need overhaul/replacement. I'm an engineer by trade, but don't have the qualifications for working on pressure vessels so I will...

Thanks for the quick reply Andy, My system is a pressurised and I only have a tank in the loft for the central heating side, which is currently turned off. The noise seems to come from pipework near the expansion vessel. However I checked this for a failed diaphragm and checked the air...

We seem to have a noise that comes from the pipe leading out of the cylinder when we turn the taps on. It is intermittent which is confusing us even more. We find it is worse first thing in the morning when we turn the shower on or flush the toilet. The noise lasts for no more than 5 seconds...

I have the same problem, did you ever find out what the cause was?