Problem isolating water supply

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I need to fit a replacement electric shower but im having a few issues isolating the water supply to the shower unit so im here for some advice.

The shower was here when i moved in and looks like it was an addition to the original plumbing work. Unfortunately there is no isolation valve on the pipe work that goes to the shower.

No problem as i thought i could turn off the mains water instead. In order to remove the old shower unit

upon turning off the mains cold water, the taps down stairs in the kitchen etc all have no water supply as you'd expect.

Upstairs however, the cold taps in the bathroom continue to flow hence im a bit reluctant to disconnect the shower inlet yet...

Up in the loft ive got three large tanks all connected up to each other as highlighted by the green lines



Tank A has the mains cold feed and a pipe has been tee'd off the cold feed directly to the shower unit using speed fit connections. No where along this "new" pipe to the shower unit can i find an isolation valve


I think that turning off the mains should safely cut off the supply to the shower since it comes off the mains feed into but id like to be a bit more sure of that before i go ahead and do it...any one able to provide a bit more knowledge on this?

On a less important note but something ill might need to know for the future is can anyone explain where the upstairs taps might being fed from? I guess it will be tanks b or c

The upstairs taps all have isolation valves near the taps which is good but if i want to change any pipe work in future it would be good to understand where they are being fed from and if i might need to completely drain those tanks in order to make any changes

(p.s I believe the system ive got is on open vented CH gravity fed domestic water.)

Thanks
Rob
 
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Your electric shower would be feed from the mains.
But to make sure you don't get caught out, turn off the mains and open all the taps and drain down.
Remove and fit an isolation valve on the pipe work leading to the shower then turn on the mains and remove any air locks.

Andy
 
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Follow the supply pipe in the attic that the shower is fed from, does it run into the first tank's fill valve? Take the top of the tank, push down the ball valve, water runs into the tank. Then isolate mains, depress the ball valve, water doesn't come out the valve then all the pipework on that supply run is isolated, including the shower feed. Fire on.
 
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