What is the required connection type for water heater relief valves?

The required connection type for water heater relief valves must allow for proper drainage and prevent any hazards associated with overpressure scenarios. A direct connection to the sewage line is improper because the discharge from the relief valve may contain hot water or steam, which should not be directed into a sewage line, as it could create a dangerous situation or damage the plumbing system. Similarly, while a flexible pipe connection may offer some benefits in specific instances, it does not ensure that the drainage is adequate for the full volume of water that might be expelled during a pressure relief event.

By requiring that the connection is the full size of the relief valve outlet and is directed appropriately to an approved drainage location, this ensures that water can be safely discharged without causing backpressure or potential blockages in the plumbing system. This practice protects not only the water heater but also helps ensure building safety and compliance with plumbing codes. Thus, having a connection that matches the outlet size with proper drainage is critical for functionality and safety.