Which type of drain is typically used for a water heater’s temperature and pressure relief valve discharge?

The correct answer involves an understanding of how a water heater’s temperature and pressure relief valve is designed to operate safely. The discharge from a temperature and pressure relief valve is intended to release hot water and steam in cases of overpressure, ensuring that the water heater does not explode or become unsafe.

A sump basin is specifically designed to handle excess water but is not the appropriate solution for handling the discharge from a water heater's relief valve.

On the other hand, direct drainage provides a straightforward way for potentially dangerous discharge to flow directly into a drainage system without restrictions. This option ensures that the discharged water does not build up or backflow, which is crucial for safety.

A service sink is often used for various plumbing functions, but it does not provide a specific solution for discharging relief valve water from a water heater.

Open receptacles can be utilized for various drainage needs, but they may not be specifically designed to handle the high heat and pressure that might accompany water from a relief valve.

In summary, knowing the characteristics of the different types of drainage systems and their appropriate applications is key. Thus, the direct drainage option ensures that any discharge from the relief valve is safely and effectively managed, maintaining safety and plumbing code compliance.