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Thanks. I presume this is the one called "the domestic cold water inlet valve" in the boiler manual?

No there isn't one

I have an Ariston combi boiler. If I want to change a washer on a hot water tap is it sufficient just to turn the mains stopcock off under the sink or do I also need to switch the boiler off & the domestic cold water inlet valve to the boiler before I run the hot water tap dry? Thanks for...