What utility does an auxiliary boiler NOT provide?

An auxiliary boiler is primarily used to generate steam for various support functions on a ship, including heating, sanitation, and auxiliary systems. The steam produced can provide heat for living quarters and other spaces, supply hot water for sanitation and cooking, and support systems such as turbines for non-propulsive functions.

However, it does not contribute directly to the main propulsion system of the ship. The main propulsion typically relies on dedicated machinery, such as main propulsion boilers or engines specifically designed for that purpose. Since auxiliary boilers are meant to support needs other than propulsion, including heating and sanitation, it is correct to state that they do not provide power for the main propulsion system.