What is the temperature threshold that requires a specific valve for water supplied to the potable distribution system?

The temperature threshold of 140°F is critical for determining the requirement for a specific valve in potable water distribution systems. At temperatures above this level, there is an increased risk of scalding, especially for vulnerable populations such as children and the elderly.

To mitigate these risks, plumbing codes often dictate the need for temperature-reducing valves or mixing valves to ensure that the water delivered at fixtures is within a safe temperature range. This not only protects occupants from burns but also helps maintain the safety and integrity of the plumbing system.

In the context of this question, selecting 140°F aligns with established safety standards that prioritize public health and welfare within water supply systems.