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.