The invention relates to a thermoelectric device, comprising pipes (8), called hot pipes, through which a first fluid can flow, and elements (3p, 3n), called thermoelectric elements, that can be used to generate an electric current in the presence of a temperature gradient. According to the invention, it comprises fins (5p, 5n) that can be configured in a heat exchange relationship with pipes (9), called cold pipes, through which a second fluid can flow at a temperature lower than that of the first fluid, and in that the thermoelectric elements (3p, 3n) are in contact, on the one hand, with the hot pipes (8) and, on the other hand, with the fins (5p, 5n), such that said thermoelectric elements (3p, 3n) generate said current.