What type of cutoff control should be used to protect steam and hot water boilers?

The correct choice of low water cutoff is essential for protecting steam and hot water boilers. This device is specifically designed to prevent boiler damage due to insufficient water levels. In the event that the water level drops below a predetermined safe level, the low water cutoff automatically shuts off the boiler to prevent overheating, which can lead to serious equipment failure or catastrophic events like explosions.

Using a low water cutoff ensures that the boiler operates safely by maintaining adequate water levels necessary for proper functioning. If the water level is too low, it can expose the boiler heat exchange surfaces, allowing them to overheat and potentially fail.

Other cutoff control options, while relevant in certain contexts, do not provide the same level of safety for boiler operation. High temperature cutoff controls are more focused on shutting down the system if temperatures exceed safe operational limits, which is not as crucial as maintaining water levels. Pressure cutoffs would address excessive pressure situations, and flow cutoffs are typically used for different equipment or systems. Hence, for steam and hot water boilers, employing a low water cutoff is the appropriate and necessary measure for ensuring safe operation and preventing damage.