What is the maximum flow rate for a single shower head when the water pressure is 60 lbs. per sq. in.?

The maximum flow rate for a single shower head at a water pressure of 60 lbs. per square inch is determined by plumbing codes and regulations. In many jurisdictions, the maximum allowable flow rate for shower heads has been set to promote water conservation without sacrificing performance.

Typically, modern shower heads are designed to have a maximum flow rate of 2.5 gallons per minute (GPM) when measured under an established water pressure, which often is around 60 psi. This standard has been adopted to allow for satisfactory performance while still adhering to environmental standards.

Thus, considering the context provided and current plumbing standards, the answer of 2.5 gallons per minute is accurate, as it aligns with these policies aimed at responsible water use and efficiency.