Which component automatically shuts the boiler down in case of low water conditions?

The low-water cut-off is a crucial safety device in a boiler system designed to prevent accidents that could arise from insufficient water levels. It functions by continuously monitoring the water level within the boiler. If the water level falls below a predetermined safe threshold, the low-water cut-off automatically shuts down the boiler. This action is essential because operating a boiler with low water can lead to overheating, damage to the boiler components, and even potentially hazardous situations, such as explosions or fires.

The low-water cut-off serves as a proactive safety measure that protects not only the equipment but also ensures the safety of personnel working in and around the boiler. In contrast, while other components listed serve important roles—such as the pressure regulator managing steam pressure, the high-water alarm signaling when water levels are too high, and the safety valve relieving excess pressure—none are designed specifically to respond to low water conditions by automatically shutting down the boiler. This distinct role makes the low-water cut-off an essential part of boiler safety systems.