DownTheAvenue wrote:
I am not trying to dilute your thread, but I wish you would consider the if you have an outside shower to check that. It is not about leaks. It is about turning the shower off at the shower head but leaving the valves open. This causes the hot water to mix with the cold and produce lukewarm water. It is possible for it not to do it all the time, as it did with me once. I know I anguished over the issue until I discovered the problem. You would be very wise to check that.
It is not the cause of my issue but thank you for your input.