Abstract: A heating device for heating a surface, in which the surface defines a plurality of predetermined areas. The heating device is electrically connectable to a power source and comprises heating circuit in communication with the surface for communicating heat to the surface. The heating circuit includes a plurality of heaters, each of which covers the respective predetermined areas. The heaters are electrically independent from one another. The alternating circuit is electrically connected to the plurality of heaters and electrically connects them to the power source. The alternating circuit alternately powers the heaters at a selected time interval so as to alternately heat each of the respective predetermined areas of the surface. There is also provided a method of using the heating device to heat the surface.

Abstract: A heating mat electrically connectable to a power source provided with a conductive prong connected to an electrical polarity defines a mat peripheral edge. The heating mat includes a conductor mounted therein and extending towards a connecting section located adjacent the mat peripheral edge. A resistive element electrically coupled to the conductor transforms the electrical energy into thermal energy. A connecting recess extends into the heating mat adjacent the connecting section and defines a prong receiving section to receive the conductive prong so that when the conductive prong is inserted into the prong receiving section the conductive prong is electrically coupled to the conductor. The prong receiving section defines a prong section base wall.