Immersion heaters do not super-heat the surface of the molten metal as do glow bar and gas fired reverb furnaces. Super-heating the surface of molten aluminum greatly increases the absorption of hydrogen into the molten aluminum and the creation of aluminum oxides at the surface, many of which become suspended in the melt or sink, only to be riled up from time to time.
35KW and 31.5KW Ultra High Efficiency Holders
When used in holding furnaces, immersion heaters more efficiently transfer heat into dip wells and degassers. The heat does not have to pass through an insulating layer of oxides on the surface of the melt, the heat source is beneath any separating refractory arch, and it is in close proximity to the dip well or degassing head.
