We able to assist you have in determining the most excellent all around product for your particular application. The exchangers are the most common way to cool a boat's engine, using the lake, river or ocean water. Marine Coolers are the best way to cool marine engines which have a bundle of tubes where the two circuits are there to transfer the heat. Sea water is corrosive so it is cooled by using a water antifreeze mixture. During the process heat from the water antifreeze mixture is transferred to sea or lake.