A fluid-heating device for heating fluid includes: a heater having a heat generating part, the heat generating part being configured to generate heat upon application of current; an electric component configured to control the application of the current to the heater; a tank having an opening portion, the tank being configured to accommodate the heat generating part; a top-plate portion configured to close the opening portion of the tank, the top-plate portion being configured to form a fluid chamber through which the fluid flows; and a first communication port and a second communication port configured to allow the fluid to flow through the fluid chamber; wherein the electric component is provided on an outer side of the fluid chamber along the top-plate portion.

A PTC heating element includes a heating element casing that fits, as a structural unit, at least one PTC element and contact plates that energize the PTC element and that form contact strips for an electrical plug connection in order to electrically connect electrodes that are electrically connected to the PTC element. The PTC element is covered with an insulation layer at least on one of its two main side surfaces. In order to provide such a heating element casing that is inexpensive to produce and of a light-weight configuration, the PTC heating element comprises an injection-molded plastic frame which encloses the insulation layer only at the edge and which defines oppositely disposed frame openings, behind which the PTC element with its main side surfaces is located.

An electric heating device a PTC heating element, a platelet-type PTC element which has two main side surfaces and face side surfaces extending perpendicular to the main side surfaces, and a casing. The casing forms inlet and outlet openings for the fluid to be heated and forms a circulation chamber in which a heat emitting surface of the PTC heating element is exposed and is coupled in a heat conductive manner to the PTC element. The PTC element is contacted in an electrically conductive manner by way of electrical conductor tracks to different polarities. A high degree of efficiency and a high output is obtained in that the conductor tracks are contacted in an electrically conductive manner to face side surfaces of the PTC element.

An electric heating device includes a casing which forms inlet and outlet openings for a fluid to be heated and a circulation chamber communicating with the inlet and outlet openings, and into which at least one PTC heating element with at least one PTC element projects which is, for electrical contact, provided with contact strips which are exposed in a connection chamber which is separated from the circulation chamber by way a partition wall. The casing further forms a control chamber for accommodating a control device which, with regard to controlling, is coupled to the at least one PTC heating element. An integrally formed casing base member, made of a plastic material, forms the partition wall and walls which circumferentially surround the circulation chamber and the connection chamber.

An electric heating device has several PTC heating elements that are arranged in a circulation chamber. The electric heating device includes a heating element casing which fits as a structural unit at least one PTC element and contact plates that energize said PTC element and form contact strips for an electrical plug connection. A partition wall separates the circulation chamber from a connection chamber in which the contact strips of the PTC heating element penetrating the partition wall are exposed and are electrically connected. A plug connection is formed between the partition wall and the PTC heating element and via which the PTC heating element is held in a frictionally engaged and/or in positive fit manner on the partition wall in the direction of insertion.

An electric heating device includes a casing that forms inlet and outlet openings for the fluid to be heated and a circulation chamber as well as a connection chamber separated from the circulation chamber by way of a partition wall. A heat-emitting surface of a PTC heating element is exposed in the circulation chamber and is coupled in a heat-conductive manner to a PTC element. The PTC element is in electrically conductive contact, which via electrical conductor tracks with different polarities that are electrically connected in the connection chamber. The casing is a plastic casing provided with a shielding.

A vehicle heater includes a plurality of heating units (12, 14) as well as a heat exchanger device (32) for transmitting heat provided in the heating units (12, 14) to a heat carrier medium (M). The heat exchanger device (32) includes, associated with each heating unit (12, 14), a heat exchanger zone for transmitting heat provided in the heating unit (12, 14) to the heat carrier medium (M).

An auxiliary heater with a casing enclosing internal components which components include a heat exchanger separate from and outside the coolant tank and wherein two coolant loops each have their own coolant pumps and wherein a potable water loop exchanges heat with coolant within the heat exchanger. A control circuit provides enhanced coolant flow through the heat exchanger when the call for hot water is significant without significantly reducing the temperature of the hot water being used. A level switch within the coolant tank prevents coolant pumps from running without pump coolant and a filling and air purging operation improves the initial filling operation of the auxiliary heater with coolant and also prevents the coolant pump from running dry. A user switch may dedicate the hot coolant from the coolant tank to either the production of hot potable water or it may share both hot water and space heating.

An electric heating device, particularly for a motor vehicle, is provided that has at least one heating element disposed in a housing, whereby the housing has a housing cover and/or a housing base with at least one opening through which the at least one heating element is disposed protruding at least in sections, whereby a sealing element in which the at least one heating element is disposed is provided in the at least one opening in the housing cover and/or in the housing base.

An electrical heating device includes a fluid-tight casing comprising inlet and outlet openings for the fluid to be heated, and at least one heat-generating element disposed in the casing. The heat generating element includes at least one PTC element and conductor elements of different polarities received in a flat tube. Heat heat-emitting elements abut against opposite sides of the flat tube. In order to increase the power density, the heat-emitting elements abut against the flat tube subject to spring pretension.