How far should the discharge piping from the temperature and pressure relief valve on a water heater terminate from the floor?

The discharge piping from the temperature and pressure relief valve on a water heater should terminate at a distance of 12 inches from the floor. This requirement is designed to ensure safety in the event of a valve discharge, as the water released can be quite hot and potentially cause burns. By specifying a 12-inch termination point, it minimizes the risk of scalding while still allowing the discharge to flow safely away from the water heater area.

This distance also allows for effective drainage while preventing water from pooling around the base of the water heater, which could create additional safety hazards. It is important for such discharge conductors to be installed according to local codes and standards to comply with safety regulations.