Webster’s Revised Unabridged Dictionary · 1913
Heater
Heat′er (hēt′ẽr), n. 1. One who, or that which, heats.
2. Any contrivance or implement, as a furnace, stove, or other heated body or vessel, etc., used to impart heat to something, or to contain something to be heated.
Feed heater. See under Feed.