At what water level will the low water level fuel cut-off shut off fuel to the heating boiler?

The low water level fuel cut-off is a crucial safety device in heating boilers designed to prevent damage due to low water conditions. It is set to activate when the water level reaches the lowest visible part of the gauge glass. This level indicates that the boiler may not have sufficient water to safely operate. If water is too low, the boiler can overheat, and the heating elements may be exposed, leading to potential failure or hazards.

When the water level falls to this point, the cut-off device will shut off the fuel supply, ensuring that the boiler does not operate under unsafe conditions. This function helps protect both the equipment and personnel from the risks associated with low water levels in the boiler system.