What is the primary function of low water fuel cut-outs in a boiler?

The primary function of low water fuel cut-outs in a boiler is to ensure safe water levels. These devices play a critical safety role by discontinuing the fuel supply to the burner when the water level drops below a predetermined point. This is essential because insufficient water levels can lead to overheating and severe damage to the boiler, including potentially dangerous situations such as boiler failure or explosion.

By cutting off the fuel when water levels are low, the system protects both the boiler and the overall safety of the boiler operation. This prevention mechanism allows operators to address the water level issue before it results in catastrophic failure, thereby maintaining the efficiency and integrity of the boiler system. Other functions, such as controlling pressure, adjusting temperature, and managing fuel input, do not specifically concern maintaining safe water levels, which is the core purpose of low water fuel cut-outs.