What does the main gas regulator control?

The main gas regulator is a crucial component in a boiler system as it is responsible for maintaining the appropriate pressure of gas supplied to the burner. This regulation is vital for ensuring that the burner operates efficiently and safely. When the gas pressure is too high or too low, it can lead to improper combustion, resulting in reduced efficiency, increased emissions, or even hazardous conditions like backfiring or explosions.

By controlling the pressure of the gas, the main gas regulator helps maintain consistent burner performance and optimizes the combustion process. This consistency is essential for the overall operation of the boiler since it directly affects heating capabilities and energy utilization.

The other options do not pertain to the function of the main gas regulator, as they involve different aspects of boiler operation, such as water flow, flue gas temperature, and liquid levels, which are managed by other specifically designed components within the boiler system.