Ceramic cartridge heaters are mainly used for the heating of aggressive liquids and oil, which means that the watt density has to be low.
The big advantage of this type of heaters is, that they can be exchanged without having to drain the complete installation.
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Ceramic cartridge heaters consist of a moisture-proof metal tube, with a ceramic element in it. The tube is in contact with the medium. Thus, the element heats indirectly. The elements can be equipped with a screw plug or a flanged connection.
Tank heating is a typical area where the heating elements that are used, like ceramic cartridge heaters, must be easy to replace. Often one does not want or cannot have the tank drained.