Abstract: The present invention provides a diesel filter system and a fuel heating device comprising a PTC heating element and a rod-shaped heat conductor which is in thermal contact with PTC heating element. The rod-shaped heat conductor comprises at least two tubular parts arranged in parallel. The PTC heating element is located between said at least two tubular parts. The system and device according to the invention is of compact constructional design and can therefore be installed in different kinds. The invention increases the rate of flow and allows for a high heat transfer from the PTC heating element to fuel.

Abstract: The invention relates to a flow heater for heating liquid in a closed cycle in a motor vehicle. The flow heater comprises at least one radiator with at least one channel, through which the liquid to be heated flows, ant at least one PTC-heating element for heating the closely adjacent radiator.

Abstract: An electric heating system comprising at least two electric heating resistors, the heating power of which being adjusted by a control device comprising a plurality of controllers each one of which has one of the electric heating resistor associated with it, wherein the control range of the control means is distributed over the controllers and wherein a different control range is associated to each controller.

Abstract: An electrically heatable warming device for warming up substances contained in a receptacle having a housing whose upper part is constructed as a cup for receiving therein a water bath, the receptacle to be introduced in said water bath. The bottom of the cup is a metallic heating plate and a heating element is at least one PTC resistance element arranged directly below the heating plate. A thermostat switch is provided for controlling the temperature and is connected to a heat-conducting member arranged laterally on the cup wall, the thermostat switch being arranged at a location where it is subjected to the direct influence of the heating element.

Abstract: In an electric radiator having a frame in which an arranged heat output elements, which include PTC resistors, and heating elements including fins, which abut on these heat output elements. The heating elements are supported by two oppositely disposed frame bars in such a way that they apply pressure to the heat output elements, said frame bars including rails having a U-shaped cross-section with flat legs extending from a central leg which is provided with longitudinally extending bulging portions separated from the central leg to impart spring properties to said bulging portions which is applied to the heating elements.

Abstract: A PTC heater for heating a tubular member includes an elongated profiled carrier body of heat conductive material having a first side provided with a flat support surface having a groove substantially perpendicular thereto extending along opposite longitudinal edges thereof and a second side provided with a channel of semi-circular cross-section for engaging the tubular member. A PTC heater element comprising a plurality of PTC resistance elements disposed between a pair of plate electrodes is positioned on the flat support surface in heat transmitting contact therewith and is covered by an elongate heat conductive cover member in flat surface engagement with the other side of the PTC heater element and provided with longitudinal rim portions closely fitted into the grooves. A U-shaped straddle clamping bracket having legs snap-fittingly anchored to the carrier body presses the cover toward the PTC heater element and carrier body.