All my radiators are piping hot when the oil-fired heating system is on but I have no hot water. Unfortunately, the system is all or nothing, you cannot switch between heating, water or both. The hot water pipe in to my hot water tank is also piping hot, but the pipe out at the base is cool. I have tried turning all the radiators off and run the boiler in case it is a pump issue, but this has had no effect. The electric heater in the tank works fine.
Please, any ideas??