Which of the following is NOT an advantage of a packaged firetube boiler?

A packaged firetube boiler is designed primarily for small to medium applications and is typically not large enough for large-scale power generation. These boilers are known for their compact design, which allows for easier transportation and installation in various settings, but their size limits their capacity for heavy industrial or large utility-scale applications.

The advantages of packaged firetube boilers lie in their cost-effectiveness, quality assurance through manufacturing processes, and the ability to perform factory testing before delivery, ensuring that the equipment meets operational standards. These features make them an attractive option for smaller applications, such as heating buildings or providing steam for smaller processes, rather than large-scale power generation. As a result, the ability of packaged firetube boilers to meet the high demands and operational requirements of large-scale power generation is significantly limited, making it the correct choice for what is not an advantage.