A Marine Heat Exchanger is a specialized type of heat exchanger used in ships and other marine vessels to transfer heat between two fluids — typically seawater and an internal working fluid such as engine coolant, lubricating oil, or fresh water — without the fluids mixing. Its main function is to maintain optimal operating temperatures for engines, generators, and other onboard systems. https://www.unitedheatexchangers.com/heat-exchanger/Marine-Heat-Exchanger/