Trace heating with and without frost protection thermostat The heating cables are assembled ready to plug in, very flexible and very economical, with consumption of just 15 W per linear metre. They can be utilised directly and contain, depending on the version, an extrusion-coated, integrated mini-thermostat which switches the cable on automatically at around +5 ºC and off again at around +8 ºC. This prevents pipes or similar installations from freezing. In order to improve heat transmission, the heating cable’s shape is flat with an elliptical cross-section. This significantly increases the surface in contact with the object to be heated (pipe, tank etc.) in comparison with other, round trace heating systems.