What is the function of an immersion heater in an engine?

The function of an immersion heater in an engine is primarily to warm the engine by replacing a freeze plug. When an immersion heater is installed, it heats the engine's coolant directly, which in turn raises the overall temperature of the engine before it starts. This is especially useful in colder climates where engines can struggle to reach optimal operating temperatures.

By serving as a replacement for a freeze plug, the immersion heater allows for direct heating of the coolant, ensuring that the entire engine can reach a suitable temperature more quickly and efficiently. This helps in reducing wear and tear during start-up, improves lubricity, and can lead to better fuel efficiency. It plays a crucial role in ensuring that the engine is ready to operate effectively and reduces emissions by allowing the engine to operate more smoothly at its ideal temperature.