Fitting isolation valves - need to drain combi?

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Hi all,

I need to fit isolation valves on the hot and cold feeds to the upstairs shower mixer. The mixer is leaking and I can't afford a new cartridge yet so just want to shut it off for now!

Thing is we had a WB combi fitted a few months ago. Before we had the combi I would have just shut off the cold main and the feed from the hot tank, cut the pipes and fitted the valves.

With the combi fitted I'm not sure how to go about this. Can I just shut off the cold main and do what I need to do? Or do I need to drain the system?

Thanks,

Rob
 
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Thanks.

So, nothing I need to concern myself about? I can just turn off the water main and cut the pipes? Obviously some water will drain out, hopefully not much though as I'll be cutting up in the loft so gravity should be on my side!
 
Turn on kitchen tap and most of the water will drain through that, it will also tell you the stop cock works or not.
 
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And don't forget to use full bore isolator valves and not the cheapo ones.
 
No wonder its leaking, its not designed to have mains pressure on it all the time, best get rid and get one thats more suitable to the high pressure.
 
I'd rather not have to replace it as it's set neatly in the tiles.

Can I get a new cartridge that can deal with the pressure?
 

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