As its name suggests, a boat engine heat exchanger transfers heat from the engine to another medium, typically water. The process begins when coolant from the engine enters the heat exchanger. As it passes through the device, the coolant is heated by the engine's hot exhaust gases. The now-hot coolant then exits the heat exchanger and returns to the engine, where it helps to keep the motor running at its optimal temperature.
There are two main types of boat engine heat exchangers: shell and tube and plate type. Shell and tube units consist of a series of tubes that are surrounded by a metal shell. Plate type units have a series of metal plates that are stacked together. Both types of heat exchangers are effective at transferring heat from an engine to water, but each has its own advantages and disadvantages.
Shell and tube units are typically more durable than plate type units, making them ideal for use in harsh marine environments. They also tend to be less expensive than plate type units. However, they are not as efficient at transferring heat as their plate type counterparts and can be more difficult to clean and maintain.
Plate typeheat exchangers are more efficient than shell and tube units but are also more expensive. They also require more frequent maintenance due to their smaller surface area, which can make them susceptible to fouling (buildup of deposits). However, their small size makes them easier to install in tight spaces aboard a boat.