What is the primary function of a low water cut off in a boiler?

The primary function of a low water cut-off in a boiler is to signal low water levels. This safety device plays a crucial role in preventing the boiler from operating with insufficient water. When water levels fall below a certain point, the low water cut-off mechanism activates to shut down the boiler. This is vital because low water levels can lead to overheating and potential damage to the boiler components, including the boiler itself. By ensuring that the boiler does not operate without adequate water, the low water cut-off helps maintain safe operating conditions, protecting both the equipment and the users.

In contrast, regulating steam pressure pertains more to pressure control systems than to the specific safety mechanisms aimed at managing water levels. Preventing overheating is a consequence of having a functioning low water cut-off but is not its primary role. Similarly, controlling fuel flow is a separate function typically managed by fuel systems and does not directly relate to water level monitoring. Thus, the focus of the low water cut-off is explicitly on monitoring and responding to water levels in the boiler system.