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gravity so no mv

you cannot fit a gate valve the wrong way the flow and return pipes for hot water on gravity should have no gate valve on it sounds like an air lock check the tank in the loft for water if you drained some out its not filled up and the coil in the cylinder is often the highest point so the...

when your pump kicks in is there water going into the small tank in the loft ie pumping over try turning your pump down if your putting fresh water into the rads often they wont last very long

scale can be a problem for disk taps also if you have high water pressure you will soak yourself when turning the taps on . stick to normal taps . get some bristain taps 5 years warranty and cheapish :@)

can you tell if the pump is running when on hot water only ie have you got a gravity system as sometime they had a non return valve that could be faulty .

don't buy an ideal as they won't honour the guarantee!!