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The purpose of a heat exchanger in a boiler system is to transfer heat from one fluid to another without mixing them. This is crucial in boiler operations where heat needs to be efficiently transferred to produce steam or heat water, while maintaining the separation of different fluids involved in the process. For example, in a steam boiler, water is heated to create steam, and this process often involves transferring heat from combustion gases to the water without allowing any combustion products to contaminate the water or steam.

The effectiveness of a heat exchanger lies in its ability to maximize heat transfer while minimizing energy loss and preventing any direct mixing of fluids. This is vital in maintaining system efficiency and ensuring safety, as mixing could lead to corrosion, contamination, or other operational issues. The design of various types of heat exchangers, like shell and tube or plate heat exchangers, further facilitates this heat transfer in an organized and controlled manner.

In contrast, while mixing fluids does have its applications, such as in certain chemical processes, it does not pertain directly to the primary function of heat exchangers in boiler systems. The other options, such as creating steam or filtering impurities, describe different components and activities within boiler operations rather than the specific role of a heat exchanger itself. Hence, the focus