noun
boilerman
A person who operates or maintains a boiler, typically in an industrial or shipboard setting. The term is a direct loan from English and is used in technical or occupational contexts.
彼は船のボイラーマンとして働いている。
He works as a boilerman on a ship.
工場ではボイラーマンの資格が必要だ。
A boilerman's license is required at the factory.