In my new house, there doesn'ts appear to be any way to turn of the hot water from the hot water cylinder, to allow me to work on some pipework. Can I just turn off cold water feed to hot water cylinder and let it drain, if what is the best way to fill it back up so i don't get any airlocks, as most taps with mains pressure seem to have mixer taps, so no way to back feed, or is there any simplier ways to solve problem. thanks for any suggestions
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