2. AN ELECTRICAL IMMERSION HEATER FOR USE IN A VAPORIZER INCLUDING A FLUID CONTAINER COMPRISING A REMOVABLE COVER FOR SAID CONTAINER, A CUP-LIKE VESSEL REMOVABLY CONNECTED TO SAID COVER SO AS TO BE SEALED OFF FROM SAID FLUID CONTAINER WHEN SAID COVER IS PLACED THEREON, SAID VESSEL HAVING A STEM DEPENDING THEREFROM INTO SAID FLUID CONTAINER, SAID STEM HAVING FORMED THEREIN A PASSAGE EXTENDING THROUGHOUT ITS LONGITUDINAL LENGTH AND TERMINATING IN OPEN COMMUNICATION WITH SAID VESSEL, SAID STEM AT ITS LOWER EXTREMITY BEING PROVIDED WITH A RESTRICTED OPENING IN COMMUNICATION WITH SAID PASSAGE AND THROUGH WHICH FLUID TO BE VAPORIZED IS ADAPTED TO PASS, SAID VESSEL AND SAID STEM BEING FORMED OF NON-CORROSIVE INSULATED MOLDED PLASTIC HEAT CONDUTIVE MATERIAL, THE MATERIAL OF SAID STEM HAVING MOLDED THEREIN A CONTINUOUS COIL OF ELECTRICAL RESISTANCE WIRE WITHIN SAID STEM AND CONVOLUTED ABOUT AND IN CLOSE PROXIMITY TO THE WALL DEFINING SAID PASSAGE,