What is the minimum pressure required for a siphoning flushometer water closet?

A siphoning flushometer water closet typically requires a minimum water supply pressure to function efficiently. The correct answer indicates that a pressure of 35 PSI is necessary. This pressure is crucial as it ensures that the flushometer can create a sufficient siphonic effect to effectively remove waste and refill the bowl after a flush.

At 35 PSI, there is enough pressure to overcome the weight of water, allowing the flush cycle to be powerful and reliable. This pressure threshold also helps maintain consistent performance over time, reducing the risk of clogs or inadequate flushing, which can occur if the pressure is too low.

In contrast, lesser pressures would likely fail to generate the necessary siphonic action, leading to ineffective flushing. Hence, understanding the operational requirements of flushometers is vital for maintaining plumbing systems, as inadequate pressure could compromise hygiene and functionality in restroom facilities.