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Thank you both for your replies. Well, Gasguru was right this time... The DYNO guy (his name was Nathan) came over and he was the first one out of 3 visiting plumbers who managed to identify the cause of the problem -and it was exactly that... Nathan told me that the plumber who installed the...

First of all, a big thank you to everyone for your replies. Picasso, I bought a check valve, this one (https://www.screwfix.com/p/non-return-shower-check-valve/71542?_requestid=359179) and fitted it where the shower hose meets the mixer, but it did not work. Gasguru, I think you may have a...

Hi everyone, I have recently entered a new property. The property is served hot water by a gas combi boiler at a fixed temperature of 55oC. The bathroom of the property has a shower mixer with a tap, similar to the one shown on the attached image. From the beginning, this setup has been...