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I don't really understand all that. How does flow rate relate to pressure? Is there a formula? The pipe is 15mm, and the shower says it needs 0.7 bar.

I suspect that all the water is from the roof tanks, since the under sink stopcock turns off all the supply everywhere. The kitchen tap is pretty fierce, actually all the taps seem fine. I just assumed the pressure to the shower was the problem because it has quite a low flow at the best of times.

Thanks for your reply. Why can't you fit a pump into the mains? Would it suck up other people's water supply, leaving them with a trickle? I'm not sure if it is the real mains anyway: we live in a 1950's maisonette block, with two huts on the roof that you can sometimes hear filling with...

Hello, I've got a problem with my new electric shower. The old one would sometimes emit warm water but then would trip the circuit after you were soapy. But mostly it just ran cold. So I bought and fitted a new BnQ essentials 8.5kW one. I got a low power one in case there wasn't enough...