Tube for heat exchanger

A heat exchanger comprising at least one tube including a first tubular element and at least one second tubular element each tubular element including two juxtaposed longer walls having essentially flat surface connected by a pair of shorter walls to form a closed profile of each tubular element, wherein in that the tube further includes at least one reversal element configured to fluidly connect the first tubular element and the second tubular element, wherein the tubular elements are arranged next to each other, so that the respective longer walls are coplanar with respect to each-other, wherein the reversal element is made integral with the tubular elements, wherein the heat exchanger further comprises:

• at least one first manifold group configured to receive one end of the tube and a second manifold group configured to receive the other end of the tube bundle, wherein the first manifold group includes at least a first channel fluidly connected with the first tubular elements, so that a fluidal communication between at least two tube bundles is provided, and in that the second manifold group includes a second channel fluidly communicated with at least second tubular elements, wherein the manifold groups are arranged next to each-other.