Heating device for an electrical appliance

A heating device for a water-conducting electrical appliance having a water passageway defined by a wall, said heating device having at least one heating element being located on an exterior surface of said wall or in said water passageway, wherein said wall of said water passageway has in vicinity of said heating device an opening and a measuring device measuring the electrical properties of water projects through said opening into said water passageway wherein an evaluating device is provided for evaluating sensor signals of said measuring device, said evaluating device being provided with a correction factor for correcting an established conductivity value falsified by a locally higher water temperature due to direct proximity to said heating element.

A heating device for a water-conducting electrical appliance comprising a tube comprising a wall with an exterior surface and an interior surface, the interior surface forming a water-passageway, said heating device having at least one heating element located in contact with said wall of said water passageway, said tube having in vicinity of said heating device an opening in the wall wherein a measuring device the electrical properties of water projects through said opening into said water passageway wherein said measuring device has at least one terminal, a pin and at least two sensors located in a sensor area, wherein said sensors are construed as capacitor plates and are used for determining a permittivity of water.