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Its a Worcester Oil fired boiler, boiler room model. There is a cylinder thermostat. Pretty sure its gravity hot water. I'm not at home so I can't tell for sure but I think there are inlet and outlet pipes for the coil. Hot water at the top of cylinder and cold water feed at the bottom.

Thanks for your help. I did switch the valve to manual open and left it for approx 30 mins yesterday but no noticable change. The outlet pipe was still cold. Is this a blockage in the coil? - I don't see any isloation valves in the pipe runs between the coil and boiler. If it is a blockage what...

Please excuse the lack of correct terminology etc but basically I have a problem with hot water when the control is switced to hot water and heating. The water does not heat quickly enough or reaches an acceptble temp (although it is warm). When the water only control is selected the water will...