Abstract: An electrically conductive physical object, e.g., a rolling-elements bearing, is inductively heated by using a first primary coil around a first core for inducing a first electrical current in the object; and a second primary coil around a second core, different from the first core, for inducing a second electrical current in the electrically conductive material. The first and second primary coils are electrically connected in parallel and the parallel connection is driven from a single switched-mode power supply.