AT our last outing the Ultraheat Water Heater refused to work on mains. I checked the circuit and concluded the element had gone. Mobile engineer came the following day and confirmed my diagnosis and fitted a new element.(£100) While chatting to him he mentioned that,probably the element itself was perfectly OK but that the little heat sensor/over ride protector wired into the element and the side of the heater was the fault. I took the element home, removed the sensor and checked the element which was fine. Does anyone know where I can buy the heat sensor? (or whatever it is called!) I can then get an electrician to fit the sensor and reuse the element when/if it goes again. Thanks