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Hi: I discovered a rusted gate valve (red handle on 15 mm pipe coming up through the floor and then going at right angles) with the handle shank rusted away so it won't turn (on the bottom left of the larger diameter pipes leading up to the central heating boiler - picture needs turning 90...

Hi: Boiler fires up and the water coming from the tap starts off hot but quickly gets very cold. Any suggestions for what I could try ? Cheers Rednight

I have a potterton profile 60 boiler (gravity fed). The radiators are nice and hot, but the domestic hot water is not warming up. I get good hot water when I use the immersion heater in the heating cylinder. Its also possible (but not 100% sure ) that when the hot water in the cylinder heated...