What should you do if water is not visible in the sight glass and it's -35 degrees Fahrenheit?

In conditions where water is not visible in the sight glass and the temperature is extremely low, such as -35 degrees Fahrenheit, it is crucial to turn off the boiler. The absence of water in the sight glass indicates that the boiler may not have sufficient water, which can lead to overheating, damage, or even a catastrophic failure. At such low temperatures, water can freeze, further complicating the situation if the boiler were to continue operating without adequate water levels.

Turning off the boiler ensures safety and prevents potential damage until the issue can be properly assessed and resolved. After the boiler is turned off, it is advisable to check the gauge glass to determine the actual water level and troubleshoot the cause of the water absence. This approach prioritizes safety and equipment integrity in potentially hazardous conditions.