Cartridge heating elements consist of a ceramic heating element in a tube, by default equipped with a cable or a junction box. The heating element is made of groove blocks (ceramic building blocks) that are combined to complete heating elements with the heat conductor in the groove passage.
They can also be delivered with a threaded finish to allow mounting directly inside the item that needs to be heated, for instance water tanks, oil containers or tubs. The advantage is that the actual heating element can be replaced without having to empty the container or the tank.
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