Which type of boiler is discussed in the context of flue gas leakage prevention?

The focus on flue gas leakage prevention relates strongly to the characteristics of a packaged watertube boiler. These boilers are designed with a series of tubes that carry water through hot gases produced by combustion. This design inherently promotes a more controlled flow of combustion gases compared to other types of boilers.

In a packaged watertube boiler, the combustion chamber is sealed and the design ensures that the hot gases are directed through specific pathways, minimizing the risk of flue gas escaping into the environment. This is crucial for maintaining safety and efficiency, as flue gases can be hazardous and contribute to environmental pollution.

While fire-tube boilers also contain flue gases within their structure, they have different operational features and typically present more challenges regarding the management of leaks due to the nature of their design. Electric boilers are not reliant on combustion, thus not applicable in the context of flue gas leakage. Steam boilers can include various designs, but in this scenario, the particular focus on flue gas leakage makes the packaged watertube boiler the most relevant option.