ECONOMIZER

economizer, economiser

(noun) a frugal person who limits spending and avoids waste

Source: WordNet® 3.1

Etymology

Noun

economizer (plural economizers)

A person who avoids waste

A heat exchange device in a boiler that improves efficiency and saves fuel

Source: Wiktionary

E*con"o*mi`zer, n.

1. One who, or that which, economizes.

2. Specifically: (Steam Boilers) An arrangement of pipes for heating feed water by waste heat in the gases passing to the chimney.

Source: Webster’s Unabridged Dictionary 1913 Edition