At what temperature must TPR valves be set to discharge at most?

The correct setting for TPR (Temperature and Pressure Relief) valves is 210 degrees Fahrenheit. TPR valves are critical safety devices in plumbing systems, particularly in water heaters. They are designed to open and release water when the temperature or pressure inside the tank exceeds safe limits, preventing potential explosions or damage.

The 210 degrees Fahrenheit threshold is established to ensure safety at a point that is high enough to prevent premature activation due to minor fluctuations in temperature, while still being low enough to mitigate the risk of scalding or severe pressure build-up. This is why the specified temperature for TPR valves is set at this level, as it provides an optimal balance of safety and functionality.

Temperatures set higher than this could pose significant risks, including the potential for more severe burns or system failures, while those set lower might not adequately protect the system from overheating. Knowing this, setting the TPR valve at 210 degrees offers a safe operating standard that is widely accepted in plumbing practices.