A heat exchanger system for recovering electric power from a heated first fluid and heating a second fluid having a lower temperature than the first fluid is provided. The system comprise a high temperature fluid passage part for conducting a first fluid, where the fluid passage part has an inner heat absorbing surface for contacting the first fluid, and an outer heat releasing surface. One or more thermoelectric elements or generators are provided having a heat receiving side, which is thermally connected to the outer heat releasing surface of the fluid passage part, and having a heat releasing or cooling side opposite the heat receiving side. The system also comprises a low temperature fluid container having a wall part with an inner surface encompassing the heat releasing or cooling sides of the thermoelectric elements and thereby the high temperature fluid passage part, whereby the heat releasing or cooling sides of the thermoelectric elements are arranged for thermally connecting to a second fluid contained within the wall part of the fluid container.