A disc pump system comprising: a pump body having a cylindrical shape defining a cavity for containing a fluid, the cavity being formed by a side wall closed at both ends by circular end walls, at least one of the circular end walls being a driven end wall having a central portion and a peripheral portion extending radially outwardly from the central portion of the driven end wall; an actuator operatively associated with the central portion of the driven end wall to cause an oscillatory motion of the driven end wall at a frequency (/) thereby generating displacement oscillations of the driven end wall in a direction perpendicular thereto, the frequency ( f ) being equal to a fundamental bending mode of the actuator ; a drive circuit having an output electrically coupled to the actuator for providing a drive signal to the actuator at the frequency (/); an isolator operatively associated with the peripheral portion of the driven end wall to reduce damping of the displacement oscillations; a first aperture disposed at a location in either one of the end walls other than at an annular node and extending through the pump body; a second aperture disposed at a location in the pump body other than the location of the first aperture and extending through the pump body; a valve disposed in at least one of the first aperture and the second aperture ; whereby the displacement oscillations generate corresponding pressure oscillations of the fluid within the cavity of the pump body, causing fluid flow through the first aperture and second aperture when in use; and characterised by a heating element thermally coupled to the actuator , the heating element comprising a conductive coil thermally coupled to a thermoelectric generator and operable to raise a temperature of the actuator to a target temperature. a pump body having a cylindrical shape defining a cavity for containing a fluid, the cavity being formed by a side wall closed at both ends by circular end walls, at least one of the circular end walls being a driven end wall having a central portion and a peripheral portion extending radially outwardly from the central portion of the driven end wall; an actuator operatively associated with the central portion of the driven end wall to cause an oscillatory motion of the driven end wall at a frequency (/) thereby generating displacement oscillations of the driven end wall in a direction perpendicular thereto, the frequency ( f ) being equal to a fundamental bending mode of the actuator ; a drive circuit having an output electrically coupled to the actuator for providing a drive signal to the actuator at the frequency (/); an isolator operatively associated with the peripheral portion of the driven end wall to reduce damping of the displacement oscillations; a first aperture disposed at a location in either one of the end walls other than at an annular node and extending through the pump body; a second aperture disposed at a location in the pump body other than the location of the first aperture and extending through the pump body; a valve disposed in at least one of the first aperture and the second aperture ; whereby the displacement oscillations generate corresponding pressure oscillations of the fluid within the cavity of the pump body, causing fluid flow through the first aperture and second aperture when in use; and characterised by a heating element thermally coupled to the actuator , the heating element comprising a conductive coil thermally coupled to a thermoelectric generator and operable to raise a temperature of the actuator to a target temperature. <EOS>