What is a low water cutoff used for in a boiler system?

The low water cutoff is an essential safety device in a boiler system that is specifically designed to prevent low water levels. When water levels in the boiler drop to a certain point, which could be dangerously low, the low water cutoff will automatically shut off the burner or fuel supply. This action helps to prevent damage to the boiler, such as overheating and potential explosions, which could occur if the boiler operates without sufficient water to absorb the generated heat. The primary function of this device is to monitor and ensure that the water level stays within safe operating limits, thus safeguarding the integrity and efficiency of the boiler system.

Other options do not accurately represent the purpose of the low water cutoff; for instance, while the device does lead to the shutting off of fuel supply, it does so specifically in response to low water levels, not for the purpose of enhancing combustion efficiency or increasing steam pressure.