At what maximum temperature should a temperature pressure-relief (TPR) valve discharge?

A temperature pressure-relief (TPR) valve is designed to enhance safety in plumbing systems, particularly in water heaters. Its primary function is to release excess pressure or temperature that can build up within the system, preventing potential hazards such as explosions or ruptures.

The maximum discharge temperature for a TPR valve is typically set at 210º F. This threshold is established to ensure that the system remains within safe operational limits. If hot water reaches or exceeds this temperature, the valve opens to release steam or hot water, thereby lowering the temperature and pressure to safe levels.

Selecting 210º F is crucial for maintaining the integrity of the plumbing system. Lower thresholds could result in premature discharge and operational inefficiencies. On the other hand, higher temperatures might not adequately protect against the risks associated with overheating, leading to dangerous scenarios. Thus, setting the maximum discharge temperature at 210º F strikes an important balance between safety and performance.