FIELD: electrical engineering. SUBSTANCE: heater has steel base with heating member made at internal base surface like resistive thick film strip type covering. There are two variants of its performance which provide three heating zones on base surface. Thermoprotective layers are made up and under of resistive film strip, first is made by electric insulating enamel covering and upper one is made by porous material layer three times thicker then substrate enamel insulating covering. EFFECT: better operation characteristics. 2 cl, 4 dwg
