Heat exchanger system, comprising a) a fluid distribution element having a central inlet and a plurality of fluid guidance channels with respectively one fluid outlet, b) at least one 1 pass heat exchanger which consists of a plurality of through-flowable tubes which are disposed in one plane and have planar partial faces, preferably flat tubes, and also fins which are connected on these planar partial faces to the tubes, and the fins can be flowed round for heat exchange with air, each of the through-flowable tubes disposed in one plane having a tube inlet for a fluid and a tube outlet for a fluid, the tube outlets opening into a fluid collection system, the fluid distribution element having the same number of fluid outlets as the 1 pass heat exchanger has through-flowable tubes, wherein the fluid distribution element comprises a fluid-sealed, channel-like fluid guide which cascades and branches in a binary manner into the plurality of fluid guidance channels and wherein c) a direct connection of the fluid distribution element to the 1 pass heat exchanger being produced, each fluid outlet of the fluid distribution element being connected integrally and in a fluid-sealed manner to respectively one tube inlet of a tube of the heat exchanger, or d) an indirect connection of the fluid distribution element to the 1 pass heat exchanger being produced, each fluid outlet of the fluid distribution element being connected integrally and in a fluid-sealed manner to respectively one tube inlet of a tube of the heat exchanger, the connection being produced via respectively a fluid-sealed, through-flowable connection element or via a connection element with a number of connecting fluid guides which corresponds to the number of fluid outlets and tube inlets to be connected. a) a fluid distribution element having a central inlet and a plurality of fluid guidance channels with respectively one fluid outlet, b) at least one 1 pass heat exchanger which consists of a plurality of through-flowable tubes which are disposed in one plane and have planar partial faces, preferably flat tubes, and also fins which are connected on these planar partial faces to the tubes, and the fins can be flowed round for heat exchange with air, each of the through-flowable tubes disposed in one plane having a tube inlet for a fluid and a tube outlet for a fluid, the tube outlets opening into a fluid collection system, the fluid distribution element having the same number of fluid outlets as the 1 pass heat exchanger has through-flowable tubes, wherein the fluid distribution element comprises a fluid-sealed, channel-like fluid guide which cascades and branches in a binary manner into the plurality of fluid guidance channels and wherein c) a direct connection of the fluid distribution element to the 1 pass heat exchanger being produced, each fluid outlet of the fluid distribution element being connected integrally and in a fluid-sealed manner to respectively one tube inlet of a tube of the heat exchanger, or d) an indirect connection of the fluid distribution element to the 1 pass heat exchanger being produced, each fluid outlet of the fluid distribution element being connected integrally and in a fluid-sealed manner to respectively one tube inlet of a tube of the heat exchanger, the connection being produced via respectively a fluid-sealed, through-flowable connection element or via a connection element with a number of connecting fluid guides which corresponds to the number of fluid outlets and tube inlets to be connected.