Abstract: The invention relates to a control device (12) for an engine-independent heater (3) that heats a liquid heat transfer medium of a heat transfer medium circuit (1) especially for motor vehicles. Said control device (12) reduces a heater (3) capacity when an actual temperature gradient ((dT/dtIst) of the heat transfer medium is equal to or exceeds a temperature gradient threshold value ((dT/dt)Schwell). The control device (12) determines the temperature gradient threshold value ((dT/dt)Schwell) dynamically in accordance with a difference in temperature (??) between a target temperature (?Soll) of the heat transfer medium and an actual temperature (?Ist) of the heat transfer medium. The invention further relates to a heater (3), a heating system (1), and a method for controlling the inventive heater (3).

Abstract: A fuel valve (10) for supplying fuel to an auxiliary heating device in a motor vehicle comprises a magnet coil (12), a magnet armature (14) and a spring (16) which can be compressed by the magnetic force generated when a pick-up voltage is applied to the magnet coil and causes the magnet armature to move; at a maximum residual voltage applied to the magnet coil, the spring overcomes the magnetic force and expands. According to the invention, a spring force-distance travelled characteristic curve (FWK) is adapted in such a way that it lies, for all relevant values of distance travelled, between a magnetic force-distance travelled characteristic curve with applied pick-up voltage (MWKA) and a magnetic force-distance travelled characteristic curve with applied maximum residual voltage (MWKR).

Abstract: The invention relates to a fuel-powered vehicle heating (10) with a first burner (12). According to the invention, the vehicle heating comprises at least one second burner (14). By means of the above large power ranges can be covered by several burners with comparatively small heating power steps.

Abstract: The invention relates to a control device (12) for an engine-independent heater (3) that heats a liquid heat transfer medium of a heat transfer medium circuit (1) especially for motor vehicles. Said control device (12) reduces a heater (3) capacity when an actual temperature gradient ((dT/dtIst) of the heat transfer medium is equal to or exceeds a temperature gradient threshold value ((dT/dt)Schwell). The control device (12) determines the temperature gradient threshold value ((dT/dt)Schwell) dynamically in accordance with a difference in temperature (??) between a target temperature (?Soll) of the heat transfer medium and an actual temperature (?Ist) of the heat transfer medium. The invention further relates to a heater (3), a heating system (1), and a method for controlling the inventive heater (3).