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1. Recover the heat from the boiler flue gas, 2. Increases the thermal efficiency of the boiler, 3. Energy saving., 4. Economic - details see: https://www.machineto.com/boiler-air-preheater-10211531

Anair 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.

In particular, this article describes the combustion air preheaters used in large boilers found in thermal power stations producing electric power from e.g. fossil fuels, biomasses or waste.

The purpose of the air preheater is to recover the heat from the boiler flue gas which increases the thermal efficiency of the boiler by reducing the useful heat lost in the flue gas.