Plumbing

Cold main up to expansion vessal is hot

Anonymous user 09/03/2024 - 2.58 PM

Hi there not sure if anyone can help, I have a un vented hot water cylinder on one of the floors in my building which apparently feeds 16 bedrooms, 3 bathrooms, 2 toilets, a hair dressers room and a sluice room. The problem I have is that the cold water main that comes up from the boiler room is hot to touch so as it goes into the expansion vessel that is hot to touch to so all my cold water is warm I've had a contractor in that says its a faulty valve under a bath or a sink or a tmv valve that's causing a problem or another personote has told me that it could be a hot pipe cross plumbed into a cold pipe. I'm stuck as to what to do for the best any ideas will be greatly received many thanks Darren