The boiler firebox, gas passages and chimney should be thoroughly cleaned by:

The boiler firebox, gas passages, and chimney require thorough cleaning to ensure optimal efficiency and safety in operation. Wire brushing and vacuuming are the preferred methods because they effectively remove soot, scale, and debris that can accumulate during the combustion process.

Wire brushing allows for the mechanical removal of stubborn deposits that can adhere to surfaces, such as carbon buildup or hardened soot, which water alone may not effectively eliminate. The use of a vacuum helps to remove these particulates from the system, preventing them from being reintroduced into the combustion area or harmful emissions from being sent out into the environment.

In contrast, flushing with water might not be effective in removing solid deposits or clogs. The use of chemical cleaners can be risky as they may leave residues or damage certain materials if not used correctly. Blasting with air, while it can remove loose debris, does not adequately address heavier build-ups that require scrubbing and suction for complete removal. Thus, wire brushing combined with vacuuming represents an efficient and safe cleaning practice for these components of a boiler system.