St23, There should be a valve either near the cold tank in the loft or in the airing cupboard in the pipe which goes to the bottom of the hot water cylinder. If neither of these exist turn off your mains water, drain down the tank in the loft by turning on a cold tap in the bathroom (preferably the bath), once the cold tap has stopped running turn on a hot tap (preferably the bath), and this should very quickly stop running. Now turn on the tap in the utility room and this should also stop running fairly quickly. You can now work on the utility tap - there is no need to drain down the hot water cylinder. end
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