Gas Fitter Practice Test

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What is the requirement for a low water cut off device on a hot water heating boiler rated at 350,000 Btuh?

Not required if a limit control is installed
Not required if it is installed in the industrial application
Required when any portion of the circulating system is located below the boiler
Required only in commercial applications

The correct answer is: Required when any portion of the circulating system is located below the boiler

The requirement for a low water cut off device on a hot water heating boiler rated at 350,000 BTUh is essential for ensuring safety and proper operation. When any portion of the circulating system is located below the boiler, there is a risk that the boiler may run low on water due to the potential for siphoning or draining. A low water cut off device acts as a safety mechanism that automatically shuts down the boiler if the water level drops too low, preventing overheating and potential damage to the boiler or components, as well as reducing the risk of boiler failure. In systems where the circulating components are positioned below the boiler, the likelihood of losing water (for instance, through leaks or drainage) increases, making the low water cut off device a necessary safety feature to safeguard the boiler operation. This requirement is outlined in various codes and standards that govern boiler operation and maintenance, emphasizing the critical role of ensuring a sufficient water supply at all times to avoid any hazardous conditions.