Abstract: A hob plate above a radiant heating device and a safety temperature limiter between said radiant heating device and hob plate, which safety temperature limiter is designed to deactivate the radiant heating device when a switch-off temperature is reached. To actuate the radiant heating device, a cooking vessel is first placed on the hob plate above the radiant heating device and then the radiant heating device is activated and at the same time detection of a first switch-on time starts. When a switch-off temperature is reached at the safety temperature limiter, the radiant heating device is deactivated by said safety temperature limiter. The first switch-on time that has elapsed up to that point between activation and deactivation of the radiant heating device is detected and compared with a predefined limit switch-on time. If the first switch-on time lies below the limit switch-on time the radiant heating device is switched off.

Abstract: A hob has a radiant heating device, a hob plate above said radiant heating device and a safety temperature limiter between said radiant heating device and hob plate, which safety temperature limiter is designed to deactivate the radiant heating device when a switch-off temperature is reached. In order to actuate the radiant heating device, a cooking vessel is first placed on the hob plate above the radiant heating device and then the radiant heating device is activated and at the same time detection of a first switch-on time starts. When a switch-off temperature is reached at the safety temperature limiter, the radiant heating device is deactivated by said safety temperature limiter. The first switch-on time that has elapsed up to that point between activation and deactivation of the radiant heating device is detected and compared with a predefined limit switch-on time. If the first switch-on time lies below the limit switch-on time the radiant heating device is switched off.

Abstract: A method for the operation of a radiant heating device for a cooktop, which device comprises two separately operable heating elements that are arranged in loops on a carrier and that are individually connectable to a power supply, and comprises a heat maintenance mode, a cooking mode and a boost mode. In the heat maintenance mode, only one heating element, with a single, fixed, relatively low heat maintenance power, is operated. In the cooking mode a different element is operated with adjustable power, and is adjusted between a relatively low minimum cooking power and a relatively high maximum cooking power. In the boost mode, all the heating elements of the radiant heating device are operated, wherein the power of all the heating elements is fixed and not adjustable.

Abstract: A radiant heating device for a hob has a sheet-like carrier with a carrier surface on its top side on which an electrical heating element runs in a meandering manner within an outer edge. A single temperature sensor is arranged in a temperature sensor housing which is arranged above a region which is free of heating elements. The temperature sensor housing covers the temperature sensor at the top and to the side and encloses the said temperature sensor in all directions. The temperature sensor housing is designed so as to be electrically insulating and thermally insulating at least at the top and to the side, wherein the said temperature sensor housing consists of an inner electrically insulating insulation housing part with the temperature sensor therein and an outer surrounding thermally insulating insulation housing part.

Abstract: A shaped thermal insulation body comprises molded and/or sintered thermal insulation material and contains fumed silica, inorganic fillers, opacifiers and fibers. The BET surface of the thermal insulation material is below 100 m2/g, e.g. between 10 and 100 m2/g, so that the shaped thermal insulation body absorbs less water. In the case of radiant heaters, the shaped thermal insulation body can be used as a base for heating resistors.