What type of boiler consists of one or more water drums?

The type of boiler that consists of one or more water drums is referred to as a drum type boiler. This terminology specifically indicates a boiler design that incorporates drums for the circulation of water and steam. In these systems, water is present within the drum, and it plays a critical role in both steam generation and the distribution of heat. The presence of the water drum(s) allows effective management of water and steam separation, ensuring that saturated steam is available for distribution.

In contrast, other types of boilers, such as fire-tube or water-tube boilers, describe different configurations and operational principles. Fire-tube boilers typically have hot gases flowing through tubes surrounded by water, while water-tube boilers have water running through tubes heated by external combustion gases. Natural circulation boilers utilize differences in density to circulate water and steam, but the term “natural circulation” does not specifically denote a drum-type structure. Therefore, a drum type boiler is the most accurate answer when specifically referring to a boiler design characterized by its inclusion of one or more water drums.