Leaking water tank

If this combination cylinder is no longer used then it should be drained and decommissioned. It will be @ risk of the water being contaminated and a legionella risk.

At this point it might be best to decommission it. What's the best way of shutting off water all together to it as the valve going into it is leaking?
 
Ideally you would shut down the mains and cut the supply pipe back to as close to the mains pipework as possible, this avoids dead legs.

As a temp measure you could shut down the mains water remove the elbow and push a stop end cap onto it but it really needs cut back close to a working section/branch of the mains pipe.
 
Ideally you would shut down the mains and cut the supply pipe back to as close to the mains pipework as possible, this avoids dead legs.

As a temp measure you could shut down the mains water remove the elbow and push a stop end cap onto it but it really needs cut back close to a working section/branch of the mains pipe.
20250331_073020.jpg

Or would I make more sense to try and put it lower? In this pic it's the pipe on the left
 
If the mains feed to the cistern is heading up then if you can get a cutter onto the pipe here then that would be the ideal spot. Even better if you could solder you could take out the tee and fit an elbow.

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If the mains feed to the cistern is heading up then if you can get a cutter onto the pipe here then that would be the ideal spot. Even better if you could solder you could take out the tee and fit an elbow.

View attachment 377786
Thanks for the reply.

Does it matter if its a plastic or metal stop end? Please could you tell me whwt tools ill need for soldering?
 
Thanks for the reply.

Does it matter if its a plastic or metal stop end? Please could you tell me whwt tools ill need for soldering?
Nope, a plastic push fit will be fine - just make sure it's cut clean and the pipe stub is clear of any old solder, paint or anything else. Push the stop end down fully until it stops, you should feel a reassuring thump as the pipe end hits the base of the fitting.

TBH, if you're not familiar with soldering then I wouldn't make my first attempt on mains water. ;)
 

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