Patent ID: 8917981

Claim:
A liquid heating device for an automobile, comprising: at least one first part made of a heat-conducting material; a liquid flow path integrally formed in said at least one first part for enabling a flow of liquid between an inlet and an outlet; and electric heating means thermally coupled with said at least one part and capable of heating said at least one part, so that the liquid flowing through said flow path can absorb the heat of said at least one part, wherein said at least one first part comprises: a planar bottom wall extending in a plane parallel to the flow path, wherein the electric heating means comprises a plurality of flat stones having a positive temperature coefficient and arranged as a matrix in a same plane in parallel and in thermal contact with said planar bottom wall, a first single electrode in the form of a planar surface in parallel and in contact with a first surface of each flat stone of said matrix, and a second single electrode in the form of a planar surface in parallel and in contact with a second surface opposite the first surface of each flat stone of said matrix, wherein said at least one first part is made of an electrical conducting material and has an electrical connection terminal, and wherein any one of the planar surfaces composing one of the electrodes among the first electrode or the second electrode is directly composed of the planar bottom wall of said at least one first part.