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Steatite elements consist of spiralized resistance wire mounted in a ceramic steatite body. Backer steatite elements can be manufactured in a variety of designs and electrical configurations. The most common variant is round steatite elements with diameters from 8 to 106mm and lengths according to customer requirements. Applications for steatite elements include indirect heating of tubes in steel, titanium, ceramic, or glass. The heaters are available both as over-the-top immersion heaters and the variant for fixed installation in tanks and cisterns. A major advantage when operating, for example, in chemical baths or extremely dirty environments is that the heater is protected against corrosion and the risk of carbonization and limescale buildup. The heater can also be replaced without having to empty the tank. Steatite elements can also be used for forced-air heating to 800-900°C in process environments or for other industrial applications. Another common application is in water heaters, where indirect heating is desired due to the water's chemical composition, such as lime and chlorides.