What is another word for donkey boiler?
Pronunciation: [dˈɒŋkɪ bˈɔ͡ɪlə] (IPA) 
A donkey boiler is a small and portable steam boiler used to power auxiliary machinery aboard a ship or vessel. Synonyms for donkey boiler include auxiliary boiler, emergency boiler, portable boiler, and temporary boiler. These boilers are called "donkey boilers" because their power output serves as a backup for the main boilers aboard a ship. Other synonyms used for donkey boiler depending on the region, include saddle boiler or Scotch marine boiler, and the boiler's design is based on the location it is being used, its size, and the power source. Regardless of its name, a donkey boiler serves a crucial purpose in ensuring the smooth operations of a ship during emergencies.
