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How do I turn off the hot water. ?

I have a combi heating system and want to turn off the hot water to replace the washer on the hot tap.I have found the main cold water cut off tap but can't find the hot cut off tap.If I turn off the main cold water does this stop water coming out the hot water tap?
HOT TAPPER!, December 2011
combi boiler have main water supply if turn off main you also stop hot water,change tap washer ,also boiler has its own stop cock to turn off

ltd, December 2011