Abstract: The electric radiant heater (101) adapted to a cooking hob is attached to the cooking plate (2a) forming with it an air cavity (13) in which the extended heating resistor (105) is housed on an insulating base (104). A peripheral outer wall (3,6) of the heater defines said cavity (13) in which there is a thermal switch (107) positioned, having a bimetal sensor (107c) the compact body (107a) of which rests on a central area (104a) of the insulating base, and its metal heat-receiving base (107b) in a position facing a heating resistor segment (105a) and either very close to or above it making contact. The relative position of the bimetal sensor (107c) enables a switching point (SWC?,SWO?) of the electrical contact (109) to be set in correlation to the hotplate warning light temperature range (TU).

Abstract: The radiant heater (1) adapted to a warmer type electric cooking plate (2) comprises an insulating base (4) supporting a heating resistor (5) resting on a central area (4a) fixed by means of metal staples (11) inserted in it, while the insulating base is provided with a guide slot (10) for the heating resistor, a peripheral annular area (4b) for fastening in a metal tray (3), and a vertical annular wall (4c) forming an enclosure below the heated plate area (2), wherein the insulating base is made of a single piece, moulded with a vermiculite mix insulating material and at least one binder compound in an aqueous solution, and a water-repellent additive in a proportion of less than 5%, the density of the resultant insulating moulding after drying being more than 350 Kg/m3.

Abstract: The electric radiant heater (1) adapted to a cooking hob is attached to the cooking plate (2a) forming with it an air cavity (13) inside which the extended heating resistor (5) is housed on an insulating base (4). A peripheral insulating ring (6) and an outer metal tray form a peripheral external wall (3,6) defining said cavity (13) in which there is positioned a bimetal thermal switch (7), which has a compact body (7a) resting on the surface (4a) of the insulating base, and a heat receiver base (7b) in a position facing a part of the heating resistor (5). The position of the compact body (7a) relative to the heating resistor (5) is determined so as to obtain an actuating temperature point (SWC, SWO) adjusted for switching a hotplate warning light on and off.