The invention relates to a liquid heating device for an automobile that comprises at least a first part (1a) made of a thermally conductive material, a liquid flow path (10a) formed integrally in said first part and enabling a flow of the liquid between an inlet and an outlet (12a), and a heating means (14) thermally coupled with said part (1a) and capable of heating said part (1a) so that the liquid flowing in said flow path can absorb the heat of said part (1a). According to the invention, the heating means includes at least one stone (14) having a positive temperature coefficient.
