An inductive heater assembly that includes an adapter portion and a coil portion. The adapter portion includes a first adapter support portion and a second adapter support portion. The first adapter support portion is configured to mechanically and electrically connect the inductive heater assembly to a power source device. The first adapter support portion includes a first adapter terminal block configured to engage a complementary terminal block of the power source device. The second adapter support portion is configured to mechanically and electrically connect the inductive heater assembly to the power tool battery pack. The second adapter support portion includes a second adapter terminal block configured to engage a complementary terminal block of the power tool battery pack. The coil portion is supported by the adapter portion. The coil portion includes a coil housing and one or more inductive coil windings.