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Waterside tubes in a water tube boiler primarily serve the purpose of heating water. In this type of boiler, water circulates through these tubes, where it is heated by the combustion gases that flow around the outside of the tubes. This heating process allows the water to transform into steam, which can then be used for various applications, such as power generation or heating in industrial processes.

The design of a water tube boiler allows for efficient heat transfer because the high-temperature gases surrounding the tubes effectively transfer their heat to the water inside. This is a fundamental operation in water tube boilers, distinguishing them from fire tube boilers, where the combustion gases are contained within the tubes and the water surrounds them.

This function is critical for the boiler's overall efficiency and effectiveness in generating steam. Therefore, understanding the role of waterside tubes in this context is essential for effective boiler operation and maintenance. Other options do not align with the primary function of the waterside tubes.