Definition of "preheater" [preheater]

• An engineering device that preheats a material prior to some other process. (noun)

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• "The absorber surface on the bottom of the preheater should be a dark color, and preferrably made of metal."
• "All you need is a good filter and a preheater to keep the oil from solidifying."
• "The remaining coke is dropped into the preheater for recycling with feedstock."