This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A person who avoids waste

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

n. One who, or that which, economizes.

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

n. One who economizes; one who uses money, material, time, etc., economically or sparingly.

n. In engineering, an apparatus by which economy, as of fuel, is effected; specifically, one in which waste heat from a boiler or furnace is utilized for heating the feed-water.

n. Also spelled economiser.

n. Specifically— In fog-signaling on British railways, a device by which the detonation of one track-torpedo on the rail by the passage of the engine-wheels removes the second one in series before the wheels reach it.

n. a frugal person who limits spending and avoids waste

"Everything that I've said might make it seem like I don't, but the fact is that I LOVE Stirling engines (Though I hate calling them that, since Stirling did not invent them, but rather patented the "economizer" a device that improves their efficiency)."

saver   

economy    economics    economic   

stinter   

rent-a-car    tricarboxylic    trimensic    fourstroke    wall plate