Afternoon all, I have a power shower, 3 bar salamander twin pump, hot water storage tank & loft stored cold water tank. All just over 3 years old. Recently I'm finding that if my wife & two kids have a shower then the shower is running completely cold by the time it's my turn. Checking the hot water feed from the hot tank, the pipe is cold. OK, so they have used all the hot water. But no, because if I then climb into the bath & use the shower attachment from the hot & cold bath taps there is more than enough hot water (still scalding) for me to have a shower & afterwards I find that the pipe from the hot tank to the hot water supply is still very hot. I'm puzzled. Does anyone have any idea? Cheers Paul.