economizer

[ih-kon-uh-mahy-zer]
noun
1.
a person who economizes.
2.
(in a boiler) a device for warming feed water with gases entering the chimney or stack.

Origin:
1830–40; economize + -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
economizer or economiser (ɪˈkɒnəˌmaɪzə)
 
n
1.  a device that uses the waste heat from a boiler flue to preheat the feed water
2.  a person or thing that economizes
 
economiser or economiser
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
To maximize the savings from economizer system, proper blending and sensing of
  the air streams must occur.
The system shall include a water economizer in lieu of air economizer.
Complete one checklist for each economizer installed.
The custom unit or custom economizer would be more likely to have problems
  occur with the economizer controls and operation.
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