Abstract: A pump includes an electric motor that is mounted in a motor compartment, a rotor that is mounted in a pump chamber and coaxial to a driven shaft of the motor and driven by the motor, a pump inlet nozzle, and a pump discharge nozzle, wherein the pump is enclosed by a housing and wherein the motor compartment is connected to a surrounding atmosphere by a ventilation channel. The ventilation channel is arranged parallel to the shaft of the motor in the housing and is guided from a lower end of the housing in the region of the pump inlet nozzle up to a passage opening that is formed directly underneath a motor bearing bracket.