Centrifugal pump having axially moveable impeller wheel for conveying different flow paths

A heating installation comprising:

• a pump assembly comprising:
• an electric drive motor;
• at least one impeller driven by the electric drive motor, wherein:
• the at least one impeller is movable in an axial direction between at least one first axial position and a second axial position;
• the at least one impeller in the first axial position is situated in a first flow path through the pump assembly and delivers fluid through the first flow path;
• the at least one impeller in the second axial position is situated in a second flow path through the pump assembly and delivers a fluid through the second flow path;
• the at least one impeller is maintained in the at least one first axial position via a first acceleration;
• the at least one impeller is moved to the second axial position via a second acceleration;
• and
• the pump assembly is configured such that a movement of the at least one impeller between the first axial position and the second axial position at least in one direction is effected by a hydraulic force which acts on the at least one impeller and is produced by the delivered fluid;
• at least two installation parts, of which a first installation part is connected to the first flow path of the pump assembly, and a second installation part is connected to the second flow path of the pump assembly;
• and
• the pump assembly is configured such that the hydraulic force can be produced by differently accelerations of the drive motor.

A boiler comprising:

• a pump assembly comprising:
• an electric drive motor;
• at least one impeller driven by the electric drive motor, wherein:
• the at least one impeller is movable in an axial direction between at least one first axial position and a second axial position;
• the at least one impeller in the first axial position is situated in a first flow path through the pump assembly and delivers fluid through the first flow path;
• the at least one impeller is maintained in the at least one first axial position via a first acceleration of the electric drive motor;
• the at least one impeller is rotated in the at least one first axial position;
• the at least one impeller in the second axial position is situated in a second flow path through the pump assembly and delivers a fluid through the second flow path;
• the at least one impeller is moved to the second axial position via a second acceleration of the electric drive motor;
• the at least one impeller is rotated in the at second axial position;
• and
• the pump assembly is configured such that a movement of the at least one impeller between the first axial position and the second axial position at least in one direction is effected by a hydraulic force which acts on the at least one impeller and is produced by the delivered fluid;
• a primary heat exchanger;
• a secondary heat exchanger for service water heating as well as at least one connection for a room heating circuit, wherein the secondary heat exchanger and the connection for the room heating circuit are connected via a branching point to the primary heat exchanger, and a hydraulic pressure prevailing at the branching point, in at least one of the positions of the at least one impeller effects a hydraulic force which holds the at least one impeller in the at least one of the positions, wherein the pump assembly is configured such that the hydraulic force can be produced by differently accelerations of the drive motor.