An immersion heater is a device which is installed in a tank or container to heat a liquid. The installation can be over-the-side, flanged, or threaded. Immersion heaters are relatively inexpensive to purchase and come in a wide range of physical configurations, materials, and temperature ranges and can be used for a wide range of applications.
Immersion heaters are made by encasing a resistance heating wire in a ceramic jacket which is then surrounded by a sheath. The sheath can be made of copper, steel, stainless steel, cast iron, incoloy, titanium, or PFA coated. As electricity flows through the heating element, it moves heat at a high rate through the ceramic jacket and sheath. The heat emanating from the sheath quickly heats the water or liquid surrounding it.
What are the Operating Temperatures of an Immersion Heater?
Immersion heaters are available in many temperature ranges. The temperature an immersion heater can output depends on the supply voltage and the resistance (watts = voltage2/resistance). Industrial immersion heaters can typically heat water to around 900°F (482°C) internally. The heat output will remain constant regardless of the environment or application since the heater’s resistance measurement is also constant.