An immersion Rod has an electrical resistance heating element encased in a tube and directly placed in the water (or other fluid) to be heated. Theimmersion Rod may be placed in an insulated hotwater tank. A temperature sensor within the tank triggers a thermostat to control the temperature of thewater.
An immersion Rod is an electric water heater that sits inside a hot-water cylinder. It acts a bit like a kettle, using an electric resistance heater (which looks like a metal loop or coil) to heat the surrounding water. Immersion Rod are connected to their own power supply via a cable.