Hi, the problem....
Vaillant combi max turbo boiler, the heating is fine. The hot water was fine until a few weeks ago. First the shower started to run tepid unless the flow turned low, then the bath tap did the same, now the basin tap is going the same way. Hot water to the kitchen is still piping hot.
We have called out 2 plumbers, first replaced the diverter valve which did nothing to improve the situation. The second suggests the problem may be with the thermostatic valve on the shower, but how does that explain the bath and basin water supply
Any ideas or explanations??