A continuous flexible cable heater having a coil continuous conductor in a plastic casing. The conductor has uncoiled regions spaced therealong between coiled regions to permit bending at a radius less than twice the jacket outside diameter. A heater assembly has the cable disposed on a support in closely folded serpentine planar array. A sensor portion of the continuous cable is folded over and adjacent the upper surface of the planar array and includes fusible protective means to cut off the heater in the event of overheating of the liquid or excess current draw.
