A magnetic heating apparatus which comprises a first rotor supporting first permanent magnets and a mating first rotor supporting second permanent magnets. The first and second permanent magnets both are arranged in alternating directions such that each pair of magnets, located directly on either side of any one of the first permanent magnets, have opposite polarities from a polarity of the magnet located therebetween. The first and the second permanent magnets are spaced from and define a panel passageway therebetween which facilitates passage of an assembled insulation panel, having a metallic core, therethrough. A first rotor drive rotates the first rotor, supporting the first permanent magnets, relative to the mating first rotor, supporting the second permanent magnets, to generate a changing magnetic field, in the panel passageway, for directly heating the metallic core of the assembled insulation panel as the panel passes therethrough without heating the non-metallic components.