Shower mixer jumping to hot bath tap

Recently had a central heating problem which required the cold feed to the hot water cylinder being shut off. Found that the hot water tank would still magically fill up. Seemed to be coming in through the pipe at the top of the cylinder which would feed the hot water taps.

It was confirmed when the cylinder was drained and cold feed to it turned off. (ie no hot water should flow to any taps.) Turning on the hot water tap in the bath and water would run out.

Traced to the shower mixer. Which seems to be leaking cold water into the hot side of the mixer and then fed back into the hot water cylinder and also the tap as it's connected there too.

The shower mixer is one of those victorian (imitation) mixers built into the wall.

What I need to know is does it require a completely new mixer (=A3300 plus the cost of fitting so effectivly =A3500) Obvioudly dont want to do that.

Or is there a DIY fix which I (with moderate experience) can try.

It's a problem as clearly cold water is trikling into the hot water tank of it's own accord 24hrs a day.

A=2E

Reply to
Londoncityslicker
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It'll only backflow if there's a pressure differential but you can put a non-return valve in. I seem to have vague recollections that these might even be required to satisfy water bylaws in some cases.

Reply to
adder1969

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