Abstract: A heating unit is presented for use in a heating device for surface heating of a body to enable maintaining a required temperature of the body. The heating unit is composed of first and second elements each made of a material with a specific resistivity in a range of about 0.01-0.01 Ohm·mm2/m, thereby enabling substantial flatness and flexibility of the heating unit. The first and second adjacent elements are accommodated in spaced-apart planes, are electrically insulated from each other, and have different resistance and different surface areas as compared to each other. The first element having the relatively high resistance and the relatively low surface area serves as a heater, and the second element, which is located closer to the body, when the heating unit is in the operation, serves as a distributor of heat created by the first element when connected to a power source.

Abstract: A heating unit is presented for use in a heating device for surface heating of a body to enable maintaining a required temperature of the body. The heating unit is composed of first and second elements each made of a material with a specific resistivity in a range of about 0.01-0.01 Ohm·mm2/m, thereby enabling substantial flatness and flexibility of the heating unit. The first and second adjacent elements are accommodated in spaced-apart planes, are electrically insulated from each other, and have different resistance and different surface areas as compared to each other. The first element having the relatively high resistance and the relatively low surface area serves as a heater, and the second element, which is located closer to the body, when the heating unit is in the operation, serves as a distributor of heat created by the first element when connected to a power source.