What is the most recommended way to check a boiler's water level?

The most recommended way to check a boiler's water level is by using a gauge glass or sight glass. This method provides a direct visual indication of the water level within the boiler. The gauge glass is constructed from transparent materials that allow operators to see the water level clearly, ensuring that it remains within the safe operating range. The accuracy and immediate accessibility of this information are crucial in maintaining safe boiler operations and preventing issues like low water conditions, which can lead to overheating and potential failure.

Using a thermometer provides temperature readings but does not reflect the actual water level, which is essential for safe boiler management. Assessing steam pressure can give some indirect insights into the operating conditions but cannot reliably indicate water levels. A visual inspection of the boiler may not accurately convey the specific water level inside the boiler and could lead to misinterpretations, especially in situations where water may be obscured or where inaccurate visual assessments could occur. Thus, the gauge glass or sight glass remains the best practice for accurately and safely monitoring the water level in a boiler system.