An immersion rod, also known as a water heater rod, is a portable electric heating device used to heat water. It consists of a metal rod, usually made of copper, with a heating element attached to one end and a plug on the other end for connecting to an electrical outlet. To use an immersion rod, the user simply places the rod into a container of water, such as a bucket or bathtub, and plugs it into an electrical outlet. The heating element heats the water, and the temperature can be controlled by adjusting the temperature control on the device. Once the water reaches the desired temperature, the immersion rod can be unplugged and removed from the water. Immersion rods are commonly used in areas where hot water is not readily available, such as in rural areas or in emergency situations. They are also popular in countries where a centralized hot water system is not available, as they provide a simple and portable solution for heating water. However, immersion rods can be less energy-efficient than other types of water heaters, as they rely on electricity to heat the water and are not designed for long-term or continuous use.