device for preheating; person who preheats something before using it
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Preheater Definition from Encyclopedia Dictionaries & Glossaries
An air preheater (APH) is a general term to describe any device designed to heat air before another process (for example, combustion in a boiler) with the primary objective of increasing the thermal efficiency of the process. They may be used alone or to replace a recuperative heat system or to replace a steam coil.
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