an electrically conductive, resistance heating member (14) having a pair of free ends joined to a pair of terminal end portions (12, 16) characterized in that said resistance heating member being fully supported by and encapsulated within an integral layer of an electrically insulating, thermally conductive, injection molded, polymeric material (30) whereby said polymeric material is in direct contact with said fluid medium, and will not melt when heating said fluid medium.
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