Which type of boiler is typically factory assembled?

The correct answer, fire tube boiler, is typically factory assembled due to its design and construction methods. In a fire tube boiler, hot gases from the combustion process flow through tubes that are surrounded by water. This design allows for a compact and efficient configuration that can be manufactured in sections, making it suitable for assembly at the factory before being transported to the installation site.

The factory assembly process is advantageous because it simplifies the installation for end users and ensures that the components are properly constructed and tested before they arrive at the site, which helps maintain quality and reliability.

While other types of boilers, like water tube and coal-fired, may also be manufactured in sections, they often require additional assembly on-site due to their more complex structures or specific operational requirements. Sectional boilers are specifically designed to be assembled on-site, as they are made up of smaller sections that are bolted together after transportation. Thus, the design and manufacturing process of a fire tube boiler make it the most likely to be factory assembled.