Capacitive sensing system using heating element as antenna electrode

A capacitive sensing system for being connected to a heating element (12) comprises a capacitive detector (24) connectable to the heating element and a common mode choke (28) for essentially preventing alternating current from flowing from the heating element to the heating current supply (22). The capacitive detector is configured for driving an alternating current into the heating element and for producing an output indicative of capacitance based upon the alternating current. The choke has a first (30) and a second (32) winding for connecting the heating element with the heating current supply. The choke comprises a third winding (34) connected in parallel of the first and/or second winding. The capacitive detector is configured for measuring a portion of the alternating current flowing across the third winding and for taking into account the measured portion of alternating current when producing the output.