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An electrical heating device includes a housing, which encloses a circulation chamber through which a medium can flow and into which heating ribs extend essentially parallel to one another. Each of the ribs has a U-shaped recess which opens into a uniform connecting chamber, which is separated from

An electrical heating device includes a housing, which encloses a circulation chamber through which a medium can flow and into which heating ribs extend essentially parallel to one another. Each of the ribs has a U-shaped recess which opens into a uniform connecting chamber, which is separated from the circulation chamber by a partition wall provided in the region of the open ends of the U-shaped recesses, and which accommodates at least one PTC heating element that abuts oppositely situated inner sides of the U-shaped recess in heat-conducting contact. The heating ribs protrude inwards alternately from the oppositely situated inner sides of the housing. A flow passage of a meander-type flow channel is formed in the housing between the free ends of the heating ribs and the adjacent inner wall of the housing. The flow passage is closed off by a covering element on the side oppositely situated to the partition wall.

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1. An electrical heating device comprising: a housing which encloses a circulation chamber through which a medium can flow, into which heating ribs extend essentially parallel to one another, each of the ribs having a fixed end, a free end, and a U-shaped recess which opens into a uniform connecting

1. An electrical heating device comprising: a housing which encloses a circulation chamber through which a medium can flow, into which heating ribs extend essentially parallel to one another, each of the ribs having a fixed end, a free end, and a U-shaped recess which opens into a uniform connecting chamber, which is separated from the circulation chamber by a partition wall provided in the region of the open ends of the U-shaped recesses, and which accommodates at least one PTC heating element that abuts oppositely situated inner sides of the U-shaped recess in heat-conducting contact, whereinsuccessive heating ribs protrude inwards from oppositely situated inner sides of the housing, whereina flow passage of a meander-type flow channel is formed in the housing between the free ends of the successive heating ribs and the adjacent inner wall of the housing, and whereinthe flow passage is closed off by a covering element on the side oppositely situated to the partition wall. 2. An electrical heating device according to claim 1, wherein the U-shaped recess is formed just as a pocket open towards the connecting chamber. 3. An electrical heating device according to claim 1, wherein the heating ribs are connected through a ridge to the assigned inner wall of the housing which is less thick than the heating rib. 4. An electrical heating device according to claim 3, wherein the exposed lateral faces of the ridges exposed to the flow channel are concave in shape, so that a hollow-shaped recess is formed between the inner wall and the heating rib. 5. An electrical heating device according to claim 1, wherein the covering element has a flow passage aperture communicating with the flow channel in the region of the face-side end of the housing. 6. An electrical heating device according to claim 5, wherein, on an underside of the heating ribs, tapered supporting ridges are formed, the face sides of which are arranged in a support level for the covering element and abut the covering element. 7. An electrical heating device according to claim 1, wherein a connecting conductor board, extending essentially parallel to the partition wall and accommodated in the connecting chamber, has conductive paths and, with electrical connecting elements, makes contact with contact lugs of the PTC heating elements protruding over the partition wall and an assembled conductor board, which is provided essentially extending at right angles to the connecting conductor board in front of a face side of the housing. 8. An electrical heating device according to claim 7, wherein, on the face side, the housing has a housing connection opening which opens to the connecting chamber and in which a plug housing is inserted, electrical plug elements of which are connected to the plug counter elements, which are provided on the connecting conductor board or on the assembled conductor board. 9. An electrical heating device according to claim 8, wherein the assembled conductor board is provided with spacing to the face side and bears at least one component producing a power loss, and that between the face side of the housing and the assembled conductor board an intermediate element is provided thermally coupling the component producing a power loss to the face side. 10. An electrical heating device according to claim 1, wherein a housing cover, which is joined to the housing and encloses the covering element for sealing between the housing cover and the housing. 11. An electrical heating device comprising: a housing, anda housing cover which is joined to the housing and which encloses a covering element for sealing between the housing cover and the housing, wherein the housing cover and the housing are each formed to enclose a circulation chamber through which a medium can flow, and into which heating ribs extend essentially parallel to one another, each of the ribs having a fixed end, a free end, and a U-shaped recess which open into a uniform connecting chamber which is separated from the circulation chamber by a partition wall provided in the region of the open ends of the U-shaped recesses, wherein the housing accommodates at least one PTC heating element that abuts oppositely situated inner sides of the U-shaped recess in heat-conducting contact therewith, wherein successive heating ribs protrude inwards from oppositely situated inner sides of the housing, and wherein a flow passage of a meander-type flow channel is formed in the housing between the free ends of the successive heating ribs and the adjacent inner wall of the housing, the flow passage being closed off by a covering element on the side oppositely situated to the partition wall. 12. An electrical heating device according to claim 10, wherein the housing cover bears a pump and forms a pump channel, which opens into an inlet opening of the pump, which is formed by a pump housing. 13. An electrical heating device according to claim 12, wherein the housing cover and at least part of the pump housing are formed from one block. 14. An electrical heating device according to claim 12, wherein the pump housing and the housing each bear a connection piece. 15. An electrical heating device according to claim 7, wherein the assembled conductor board also bears components of a control device for the pump. 16. An electrical heating device according to claim 6, wherein the housing cover forms support counter ridges corresponding to the support ridges, and wherein the covering element is clamped between the support ridges and the support counter ridges. 17. An electrical heating device according to claim 8, wherein a control housing encloses the assembled conductor board and forms a control housing connection opening provided corresponding to the housing connection opening and wherein a further control housing connection opening, which in relation to a level accommodating the covering element is formed mirrored on the control housing. 18. An electrical heating device comprising: a housing, which encloses a circulation chamber through which a medium can flow, and into which heating ribs extend essentially parallel to one another, each of the ribs having a fixed end, a free end, and a U-shaped recess which opens into a uniform connecting chamber, which is separated from the circulation chamber by a partition wall provided in the region of the open ends of the U-shaped recesses, and which accommodates at least one PTC heating element that abuts oppositely situated inner sides of the U-shaped recess in heat-conducting contact therewith,wherein successive heating ribs protrude inwards from oppositely situated inner sides of the housing, whereina flow passage of a meander-type flow channel is formed in the housing between the free ends of the successive heating ribs and the adjacent inner wall of the housing, the flow passage being closed off by a covering element on the side oppositely situated to the partition wall, and whereinthe heating ribs are connected through a ridge to the assigned inner wall of the housing, which is thinner than the heating ribs. 19. An electrical heating device comprising: a housing, which encloses a circulation chamber through which a medium can flow, into which heating ribs extend essentially parallel to one another, each of the ribs having a fixed end, a free end, and a U-shaped recess which opens into a uniform connecting chamber, which is separated from the circulation chamber by a partition wall provided in the region of the open ends of the U-shaped recesses, and which accommodates at least one PTC heating element that abuts oppositely situated inner sides of the U-shaped recess in heat-conducting contact,wherein successive heating ribs protrude inwards from oppositely situated inner sides of the housing, whereina flow passage of a meander-type flow channel is formed in the housing between the free ends of the successive heating ribs and the adjacent inner wall of the housing, the said flow passage being closed off by a covering element on the side oppositely situated to the partition wall, and whereinthe exposed lateral faces of the ridges exposed to the flow channel are concave in shape, so that a hollow-shaped recess is formed between the inner wall and the heating rib. 20. An electrical heating device according to claim 1, wherein the flow channel has successive flow channel sections which extend at right angles to a longitudinal extension of the housing from oppositely situated inner sides of the housing and are each bounded by outer walls of heating ribs. 21. An electrical heating device according to claim 11, wherein the flow channel has successive flow channel sections which extend at right angles to a longitudinal extension of the housing from oppositely situated inner sides of the housing and are each bounded by outer walls of heating ribs.