He carefully got to his feet and gingerly cupped the wash water in the tank next to him in his gloved hands and drank from it. You walk out of a steam boiler and see how picky you were with water sources. Having done that, he navigated around it and reached the boiler itself. It was wrought iron, self-contained heater which he occasionally had to shovel ridiculous amounts of coal into in order for it to stay hot enough to keep everything going. It sat inset in the back wall of the hold next to the boiler room like an ominous black beetle embedded in the corner of the ship. He pulled down on a large lever and heard the metal plates shift into place and utterly shut off oxygen access to the flames. No sense wasting the good coal.