An advantage of a vertical tubeless firetube boiler is that it requires:

The advantage of a vertical tubeless firetube boiler being that it requires relatively small floor space is due to its design. Vertical configurations often occupy less horizontal area compared to traditional horizontal boilers, making them more suitable for installations where space is limited. This compact design is beneficial in various settings, including commercial and industrial applications, where maximizing usable floor space is crucial.

Additionally, the vertical orientation allows for efficient heat exchange and enhanced natural circulation of water, contributing to overall operational efficiency while minimizing the footprint. This effectiveness in space utilization is one of the primary reasons why many facilities opt for this type of boiler, particularly in urban or confined environments.