A pump assembly defining a longitudinal axis, the pump assembly comprising: an assembly inlet for inputting fluid; an inlet passage; an assembly outlet for outputting fluid; an electric motor contained within a motor casing; a pump having a pump housing (21, 24), the inlet passage for communicating the input fluid longitudinally from the assembly inlet to the pump, the pump having an inlet for receiving input fluid from the inlet passage, at least one rotor (50, 52) for pressurizing the received input fluid, and a transfer outlet port for outputting pressurized fluid; a drive shaft connecting the electric motor to the pump, the drive shaft being configured to be driven about the longitudinal axis by the electric motor; a controller provided within the motor casing and configured to drive the electric motor, wherein the pump and the electric motor are on opposing axial sides of the controller; a heat conductive cover plate positioned between the pump and the controller, the heat conductive cover plate conducting heat from the controller and connected to the motor casing for containing the controller therein, the heat conductive cover plate comprising a first axial side and a second axial side, the first axial side of the heat conductive cover plate facing the pump housing and the second axial side of the heat conductive cover plate facing the motor casing, wherein the controller is contained by the second axial side of the heat conductive cover plate; a transfer passage provided in the first axial side of the heat conductive cover plate for receiving the pressurized fluid output from the transfer outlet port of the pump and directing the pressurized fluid along and in contact with the heat conductive cover plate to conduct heat therefrom into the pressurized fluid; and an outlet passage (27, 18) communicating the transfer passage with the assembly outlet to discharge the pressurized fluid, the outlet passage for communicating the pressurized fluid from the pump longitudinally to the assembly outlet, wherein the drive shaft extends through the controller and the heat conductive cover plate. an assembly inlet for inputting fluid; an inlet passage; an assembly outlet for outputting fluid; an electric motor contained within a motor casing; a pump having a pump housing (21, 24), the inlet passage for communicating the input fluid longitudinally from the assembly inlet to the pump, the pump having an inlet for receiving input fluid from the inlet passage, at least one rotor (50, 52) for pressurizing the received input fluid, and a transfer outlet port for outputting pressurized fluid; a drive shaft connecting the electric motor to the pump, the drive shaft being configured to be driven about the longitudinal axis by the electric motor; a controller provided within the motor casing and configured to drive the electric motor, wherein the pump and the electric motor are on opposing axial sides of the controller; a heat conductive cover plate positioned between the pump and the controller, the heat conductive cover plate conducting heat from the controller and connected to the motor casing for containing the controller therein, the heat conductive cover plate comprising a first axial side and a second axial side, the first axial side of the heat conductive cover plate facing the pump housing and the second axial side of the heat conductive cover plate facing the motor casing, wherein the controller is contained by the second axial side of the heat conductive cover plate; a transfer passage provided in the first axial side of the heat conductive cover plate for receiving the pressurized fluid output from the transfer outlet port of the pump and directing the pressurized fluid along and in contact with the heat conductive cover plate to conduct heat therefrom into the pressurized fluid; and an outlet passage (27, 18) communicating the transfer passage with the assembly outlet to discharge the pressurized fluid, the outlet passage for communicating the pressurized fluid from the pump longitudinally to the assembly outlet, wherein the drive shaft extends through the controller and the heat conductive cover plate.