What type of boiler can handle rapid load changes due to less water content?

The correct answer is the type of boiler that can handle rapid load changes due to its design featuring less water content. Water tube boilers are constructed so that water flows through the tubes, which are heated on the outside by combustion gases. This design allows for a smaller volume of water compared to fire tube boilers, where water surrounds the combustion gases.

Because water tube boilers contain less water, they can respond more quickly to changes in load requirements. When there is a sudden increase in demand for steam, the water in the tubes heats up rapidly, enabling the boiler to produce steam more quickly. This flexibility is particularly valuable in applications where load demand fluctuates frequently or requires immediate changes.

In contrast, fire tube boilers retain a larger volume of water, which makes them slower to respond to load changes. Other types of boilers, while they may have their own advantages, do not similarly offer the rapid adaptability to pressure variations and load shifts that water tube boilers do.