An inductive heating arrangement (10; 310; 410) comprising: a first inductor coil arranged to generate a first varying magnetic field when a varying electric current flows through the first inductor coil ; a second inductor coil arranged to generate a second varying magnetic field when a varying electric current flows through the second inductor coil ; and a flux concentrator (20; 313; 413) positioned around the first inductor coil to distort the first varying magnetic field generated by the first inductor coil , wherein the flux concentrator has a tubular shape and comprises: a main portion positioned around the first inductor coil , the main portion having an inner diameter, a first end and a second end; a first end portion at the first end of the main portion , the first end portion having an inner diameter, wherein the inner diameter of the first end portion is smaller than the inner diameter of the main portion ; and a second end portion at the second end of the main portion , the second end portion having an inner diameter, wherein the inner diameter of the second end portion is smaller than the inner diameter of the main portion ; wherein an inner surface of the flux concentrator defines an annular channel between the first end portion and the second end portion , and wherein the first inductor coil is positioned within the annular channel between the first end portion and the second end portion . a first inductor coil arranged to generate a first varying magnetic field when a varying electric current flows through the first inductor coil ; a second inductor coil arranged to generate a second varying magnetic field when a varying electric current flows through the second inductor coil ; and a flux concentrator (20; 313; 413) positioned around the first inductor coil to distort the first varying magnetic field generated by the first inductor coil , wherein the flux concentrator has a tubular shape and comprises: a main portion positioned around the first inductor coil , the main portion having an inner diameter, a first end and a second end; a first end portion at the first end of the main portion , the first end portion having an inner diameter, wherein the inner diameter of the first end portion is smaller than the inner diameter of the main portion ; and a second end portion at the second end of the main portion , the second end portion having an inner diameter, wherein the inner diameter of the second end portion is smaller than the inner diameter of the main portion ; wherein an inner surface of the flux concentrator defines an annular channel between the first end portion and the second end portion , and wherein the first inductor coil is positioned within the annular channel between the first end portion and the second end portion . a main portion positioned around the first inductor coil , the main portion having an inner diameter, a first end and a second end; a first end portion at the first end of the main portion , the first end portion having an inner diameter, wherein the inner diameter of the first end portion is smaller than the inner diameter of the main portion ; and a second end portion at the second end of the main portion , the second end portion having an inner diameter, wherein the inner diameter of the second end portion is smaller than the inner diameter of the main portion ; wherein an inner surface of the flux concentrator defines an annular channel between the first end portion and the second end portion , and wherein the first inductor coil is positioned within the annular channel between the first end portion and the second end portion . <EOS>