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Immersion heater An electrical resistance heating element enclosed in a tube and inserted into the water (or other fluid) being heated is what makes up an immersion heater. To prevent corrosion and make maintenance easier, the heating element can either be put inside a metal conduit or injected directly into the liquid. Since they are designed to be used just temporarily and under the supervision of an operator, portable immersion heaters might not feature a control thermostat. Permanently placed heating components in an insulated hot water tank may be used for home hot water delivery or industrial process hot water, with the temperature being controlled by a thermostat. Few kilowatts is the maximum rating for household appliances. A commercial water heater may have a 2000 kilowatt capacity. Whenever off-peak electric tariffs are offered, p ermanently placed heating components in an insulated hot water tank may be used for home hot water delivery or industrial process hot water, wi...