What is true about packaged boilers?

Packaged boilers are designed as fully integrated units that are constructed and assembled at the manufacturing facility before they are transported to the installation site. This factory-built nature means that all components, such as the boiler pressure vessel, burner, controls, and other necessary equipment, are installed and tested as a single system prior to shipping. The advantage of this approach is that it allows for more efficient assembly, easier installation, and often better quality assurance since the entire system has been tested in a controlled environment.

The other statements do not accurately represent the characteristics of packaged boilers. They are not shipped disassembled in a packing case; rather, they arrive as a complete unit ready for connection to utilities. There are also no strict limitations at 100 kPa for all packaged boilers, as many are rated for higher pressures. Lastly, while some boiler designs include risers and downcomers, packaged boilers can come in various configurations that may not necessarily include these components.