Why are low water cut-offs important in steam heating boilers?

Low water cut-offs are crucial for ensuring the safe operation of steam heating boilers primarily because they prevent dry-firing of the boiler. When the water level drops below a safe threshold, the boiler can overheat, leading to severe damage or even catastrophic failure. The low water cut-off device detects this drop in water level and automatically shuts off the burner, thus preventing the heating element from operating without enough water present. This function is vital for maintaining the integrity of the boiler and ensuring safe operation.

While other options may touch on relevant issues, such as overheating or water hammer, their connection to the primary function of low water cut-offs is less direct. The main purpose remains focused on eliminating the risk of dry-firing, thereby protecting both the equipment and the safety of all working with or around the boiler system.