Heat pump comprising a number of hollow elements (2) with a first zone (2a), a second zone (2b) and a working medium which can be displaced in a reversible manner between the first and second zones, also comprising a number of plate elements (1) and a number of through-passage regions of a first type (4) arranged between the plate elements (1), further comprising a number of through-passage regions of a second type (5) arranged between the plate elements (1), and additionally comprising at least two distributing devices (7, 8) which are arranged at the ends of the plate elements (1) in each case, are provided for distributing a first fluid through the through-passage regions of the first type (4) and each have a fixed hollow cylinder and a distributor insert (7a, 8a) which can be rotated in the hollow cylinder, the distributor insert (7a, 8a) having partition walls (7b, 8b) which separate off at least four separate chambers (11) in each of the cylinders, and a flow path which comprises at least one through-passage region (4) being defined by way of each of the chambers (11).