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Cold water from hot taps although cylinder hot!
Hi, I really hope someone can help on this one!
I've had no hot water since last Wednesday, even though the heating is working and the hot water cylinder and all the pipes in and out are really hot. Everything was fine until I had a new hand basin installed in my bathroom on Weds. The plumber turned the water off in the airing cupboard and when he left I realised the water coming out of the hot taps was cold. To cut a long and frustrating story short, four days later and after four separate visits from two plumbers and two heating engineers I still have the same problem. We've gone through various solutions - airlock (plumber said there isn't one) and testing all the taps and valves on the pipes - and everyone is stumped. The cylinder is hot, the pipes are untouchabley hot and the water flow from the taps isn't spluttering or inconsistent. I turned the hot water of about 8pm last night as it seemed pointless to keep heating it up but even now the pipes in and out of the tank are still really hot. The only other out of the ordinary thing that happened on Weds was I had a new fuse box fitted so the mains power was out for a couple of hours.
One of the plumbers mumbled something about the shower mixer valve maybe drawing cold into the hot water supply...but he didn't think this was worth looking at so I don't know how likely this is!
If anyone can help or throw some new suggestions at me i would be extremely grateful.
Thanks so much for taking the time to read this.