What is the primary purpose of the chimney or breeching in a boiler system?

The primary purpose of the chimney or breeching in a boiler system is to direct hot gases outside. This component is essential for the safe and efficient operation of the boiler, as it ensures that combustion gases produced during the heating process are expelled from the building. Proper ventilation through the chimney or breeching prevents the buildup of harmful gases, such as carbon monoxide, and helps maintain indoor air quality. By effectively channeling these gases away, the chimney not only protects the integrity of the boiler system but also contributes to overall safety in the operating environment.

While other options refer to important operations within a boiler system—such as water level control, gas pressure monitoring, and system shutdown—these functions are managed by different components and systems, rather than the chimney or breeching itself.