Heating device

The invention relates to a heating device (1) with a housing (3) having a fluid channel arranged therein with a fluid inlet (6, 7) and a fluid outlet (6, 7), wherein a coil (8) generating an alternating magnetic field is provided in the housing (3), which is sealed off from the fluid channel by a coil housing (9), and wherein furthermore at least one metallic surface heating element (18, 19, 20) is provided, which can be heated by the alternating magnetic field, wherein the at least one surface heating element (18, 19, 20) is arranged unsupported in the fluid channel, wherein the fluid channel is subdivided into at least a first channel (14, 15, 16, 17) and a second channel (14, 15, 16, 17), wherein the walls delimiting the channels (14, 15, 16, 17) are formed by the coil housing (9) and/or by a surface heating element (18, 19, 20).