What is a major disadvantage associated with firebox boilers?

A major disadvantage associated with firebox boilers is the difficulty in cleaning and inspection. Firebox boilers often have a design that can complicate access to internal components, making it challenging to conduct thorough maintenance and inspection. Accumulation of soot, scale, or other deposits can adversely affect performance and efficiency.

Regular cleaning is crucial for the optimal operation of boilers to ensure that heat transfer surfaces remain effective. However, the design characteristics of firebox boilers may make it cumbersome to reach all necessary areas for cleaning, potentially leading to neglect in maintenance routines. This can result in the boiler operating less efficiently and increasing the risk of overheating or failure.

Hence, the difficulties in both cleaning and inspecting firebox boilers make them less favorable compared to other boiler designs that might offer easier access and maintenance.