What are the two types of immersion heater?

There are two types of immersion heaters: the traditional immersion heater and the modern, more energy-efficient, and safer version. The traditional immersion heater works by heating up the water directly, while the modern version of the immersion heater uses a heating element that heats up the air around the water, indirectly heating up the water. Both types of immersion heaters have their advantages and disadvantages, but ultimately they serve the same purpose of providing hot water for use in homes and businesses. With advancements in technology, immersion heaters continue to evolve and improve, making them even more efficient and reliable.