I need to replace a part in our shower so I obviously want to stop the water getting to it while I am working on it. The problem is, neither hot or cold have working isolation valves. Actually, I think the cold might, but my main problem is with the hot.
The hot pipe comes off the top of the hot water tank, right at the top of the cylinder and goes up throught the loft and down to the bathroom.
I was thinking of just turning off the main water supply coming into the house and then turning on the taps and the shower to get the last bit of water from the pipes? Does this drain the whole cylinder? is that necessary?
When I switch it back on, does the whole cylinder have to fill up before water comes out the top?
Its a power shower which I believe should not have been installed with "up and over" hot pipe, but it wasn't my doing...
TIA
edit - just to say, its not the pump I am replacing, surprisingly, the shower has worked fine for 6 years but has now developed a drip which according to the manufacturers is a dodgy solenoid valve.