Where should the TPR discharge pipe discharge through?

The TPR (Temperature and Pressure Relief) discharge pipe should ideally discharge through an air gap located in the same room as the water heater. This method ensures that any hot water or steam released due to excessive pressure or temperature is safely expelled without risking damage to the building structure or providing a pathway for harmful gases or liquids to enter the living space.

Discharging through an air gap is critical because it helps to prevent back siphoning of contaminated water into the potable water supply. By maintaining an air gap, it creates a physical separation between the discharge and the water supply, which is a fundamental aspect of plumbing safety. Additionally, having the discharge in the same room as the water heater allows for easy visibility and access, so any discharge can be monitored and addressed if necessary.

Other discharge methods may not provide the same level of safety or might lead to other complications. Venting into the ceiling could cause trapped gases or pressure to build up in an unsafe manner. Discharging directly outside might not account for local plumbing codes or could result in water pooling near the foundation. Meanwhile, a direct waste line could lead to backflow issues if not installed with proper safeguards. All these factors emphasize the importance of using an air gap for the TPR discharge pipe in compliance with