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I want to change a washer on the hot tap of a kitchen mixer tap if it was cold I would turn water off at the mains 1st? but as its hot water and I dont have a hot water tank as such to turn of the hotwater tank. I have a outside worcester oil boiler with a tank in it which heats my hot water. Do I have to turn off cold mains. then run all hot and cold water off 1st before taking valve off tap or what?