What role does the "Auxiliary boiler" serve on a vessel?

The auxiliary boiler plays a crucial role in a vessel's operations by generating steam when the load on the main boiler is minimal. This functionality is essential for various onboard processes, such as heating spaces, cleaning operations, and supplying steam for auxiliary machinery that may not operate directly from the main boiler. The ability to provide steam in low-demand situations ensures that the main boiler can remain efficient and focused on primary tasks, while the auxiliary boiler effectively manages the auxiliary needs of the ship.

In contrast, powering the main propulsion system is a function of the main engine, not the auxiliary boiler. The roles concerning fuel storage and food preparation also fall outside the primary purpose of an auxiliary boiler, as it is designed specifically for steam generation rather than storage capacities or culinary functions. Thus, the auxiliary boiler is integral to maintaining operational efficiency and meeting the various steam demands of the vessel without overloading the main boiler system.