How do you find is best to drain the hot water so you can change a tap on an old vented tank and cylinder system. There is no isolation valves. Do you risk the gate valve on the cold feed to the cylinder?
Gate valves really belong in the days of steam, but may leak at the gland, may be seized, may not shut off the supply - who knows?
Either tie up the ball valve on the loft header tank or plug its outlet.....I prefer the former.
John
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