Where should the TPR discharge pipe be directed?

The TPR (temperature and pressure relief) discharge pipe is a critical component of a water heater's safety system. Its primary purpose is to safely release excess steam or hot water in the event of an overpressure situation, preventing potential explosions.

Directing the TPR discharge pipe through an air gap or air break is essential for maintaining safety and preventing backflow. An air gap is essentially a space between the end of the discharge pipe and the flood level of a drainage system. This design ensures that any discharged hot water or steam does not create a potential pathway for contaminated water to back siphon into the potable water supply.

By employing an air gap or air break, you ensure that the discharge of hazardous hot water or steam is adequately vented away from any surfaces or structures that could be damaged or create a safety hazard, contributing to a safer plumbing system overall. Additionally, this practice complies with plumbing codes, which often stipulate that TPR valves must have an unobstructed and visible discharge path to prevent accidents and maintain safety standards.