Marine auxiliary systems are responsible for providing heating and cooling for the ship, as well as other essential services such as ventilation, air conditioning, and refrigeration.

Refrigerators are not typically considered to be marine auxiliary systems, as they are not essential for the operation of the ship.

Boilers are used to generate steam, which is then used to drive turbines or other machinery.

Condensers are used to condense steam from the turbine exhaust, which is then returned to the boiler as feedwater.

Turbines are used to drive propellers, which provide propulsion to the ship.

Pumps are used to pump water for a variety of purposes, such as cooling, firefighting, and bilge pumping.

Compressors are used to compress air for a variety of purposes, such as powering pneumatic tools and starting diesel engines.

Generators are used to generate electricity for the ship's electrical systems.

Purifiers are used to clean oil, which is then used to lubricate machinery.

Heaters are used to heat air or water for a variety of purposes, such as space heating, domestic hot water, and engine cooling.

Coolers are used to cool air or water for a variety of purposes, such as air conditioning, refrigeration, and engine cooling.

Filters are used to remove impurities from a fluid, such as water, oil, or air.

Separators are used to separate two fluids or solids, such as oil and water, or steam and water.

Valves are used to control the flow of a fluid, such as water, oil, or air.

Pipes are used to transport a fluid, such as water, oil, or air.