What is the function of a boiler water level gauge?

• A. To monitor fuel level.
• B. To indicate boiler water level and prevent low-water or overfill conditions.
• C. To measure steam pressure.
• D. To detect boiler temperature.

Answer: (B)

The function of a boiler water level gauge is to show the actual water level inside the boiler, providing a visual reading that helps keep the water within a safe range. Maintaining the proper level is crucial because too little water allows the boiler tubes to overheat and fail, while too much water can cause carryover of water with the steam and inefficient, potentially damaging operation. The gauge is typically a sight glass connected to the boiler and marked with safe operating limits. It doesn’t monitor fuel level, measure steam pressure, or detect boiler temperature—those tasks are handled by separate instruments.