A feature of water tube boilers compared to fire tube boilers is that:

Water tube boilers are designed to operate at higher pressures than fire tube boilers due to their construction and the way they handle the flow of water and steam. In a water tube boiler, water circulates within the tubes, and hot gases from combustion flow around these tubes. This configuration allows water tube boilers to withstand higher pressure since the water is contained within the tubes and can absorb heat more effectively, leading to steam generation at elevated pressures.

The ability to operate at higher pressures makes water tube boilers suitable for certain industrial applications where high-pressure steam is necessary for processes and for driving turbines. This capacity for high pressure is a significant advantage over fire tube boilers, which are generally limited in pressure due to the stress on the shell of the boiler and the design limitations associated with their construction.

Thus, the unique design of water tube boilers facilitates their functioning at higher pressure levels, making them an essential choice in industries where such requirements are critical.