Immersion heaters are electrical screw-in heating elements for direct heating of liquids, gases, and viscous substances. An immersion heater consists of a blind flange or screw head with several U-shaped tubular heating elements soldered into it. On request, they can be equipped with a temperature limiter or a protective cover. Immersion heaters are frequently used in plant and mechanical engineering or laboratory and medical applications. For immersion heaters, we recommend the use of overheating protection, as a dry run can cause high temperatures at the heating element.