What is the maximum BTU input for a burner to require one low water fuel cut-out?

The requirement for a low water fuel cut-out in a boiler system is dictated by safety standards that aim to prevent unsafe operating conditions, particularly low water levels that can lead to overheating and damage. According to these standards, a burner that has a maximum input of 750,000 BTUs or less is mandated to be equipped with at least one low water fuel cut-out. This device serves to shut off the fuel supply if the water level falls below a certain threshold, ensuring that the boiler does not operate without sufficient water to absorb the heat generated by the burner.

The context for this requirement arises from the potential hazards associated with low water conditions. If a boiler operates without adequate water, it can lead to overheating and catastrophic failure. Therefore, the stipulation for the installation of a low water fuel cut-out at this BTU input level is a critical safety measure in boiler operation protocols within the industry.

While higher BTU inputs also require stringent safety measures, they typically necessitate additional mechanisms such as secondary cut-outs or redundant systems to ensure even greater safety. Hence, the choice of 750,000 BTUs reflects a well-established benchmark in boiler safety practices.