2 choices, either try the gate valve you might drop lucky,or turn off at the mains and drain CWSC, you will have to do this anyway if you want to isolate the cold and if your going to fit an isolation valve to isolate the CWSC.
2 choices, either try the gate valve you might drop lucky,or turn off at the mains and drain CWSC, you will have to do this anyway if you want to isolate the cold and if your going to fit an isolation valve to isolate the CWSC.
(Cold water storage cistern), the big tank that supplies your hot water cylinder.
Yes that's pretty much what you need to do.
The cylinder will still be full of water it will only be the CWSC that empty's.
No need to turn boiler off.
You could also fit an isolation valve to the mains feed into the CWSC if you wanted.
An isolation valve would be sufficient as long as nobody tampers with it but if it makes you feel more comfortable push fit end stops would be a good back up aswell as the valves.
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