Abstract: An electrode type steam vaporizer device is disclosed which includes a plurality of ferrite electrodes positioned in a water receptacle wherein AC voltage is applied to the electrodes thereby vaporizing water in the receptacle. Each of the ferrite electrodes is a sintered body made of a mixture of iron oxide and a divalent nickel oxide. The ferrite electrodes are contained in an electrode assembly located within the body of the water receptacle such that a pair of electrode terminals extend through the top wall of the receptacle. A cover having a power source connector receiving concavity in its surface is positioned on top on the water receptacle. The cover is rotatable between a first position where the concavity is in registry with the electrode terminals and a second position where the concavity is out of registry with the terminals. A power source connector is received in the concavity and is connectable with the electrode terminals only when the cover is in the first position.