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Hi, sorry yes, it is in the return. The CH and HW share a common flow from the boiler. Regards Mark.

Hi, I'm trying to replace a hot water tap washer. When I go to the airing cupboard to turn off the cold water feed to the hot water tank I can see a red wheel gate valve which is ok but I've also noticed another red wheel valve in the flow from the boiler to the hot water cylinder...