The invention relates to a heat exchanger comprising a plurality of tubes which are accommodated in a space of the heat exchanger, wherein at least one first tube of the plurality of tubes is in connection with a first fluid circuit and at least one second tube of the plurality of tubes is in connection with a second fluid circuit, wherein furthermore the heat exchanger comprises at least one element having at least one first chamber which is in connection with the at least one first tube and at least one second chamber which is connection with the at least one second tube, and wherein the element has an inlet or outlet to the first chamber and an inlet or outlet to the second chamber.