Stoker (noun)

1. A person whose job is to tend a furnace and to feed fuel into it.
2. A device that automatically feeds fuel into a furnace or boiler.

Origin:

From the middle english stokkere, stoker, from the old english stōcian ("to kindle, stoke"), from stōc ("a stic.k")

Examples:

1. The stoker shoveled coal into the furnace to keep it burning.
2. The new stoker machine made the job of feeding the furnace much easier.
3. The stoker had to wear a thick coat to protect himself from the heat.
4. The ship's stoker was responsible for keeping the boilers going.
5. The stoker worked in the engine room, feeding the furnace with coal.