Rhode Island Journeyman Plumber Practice Exam

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What is the required water heater drain size?

1 inch below the installation level
2 inches below the installation level
3 inches below the installation level
4 inches below the installation level

The correct answer is: 3 inches below the installation level

The standard requirement for a water heater drain size is generally 3 inches below the installation level. This specification is crucial because it facilitates the proper drainage of any condensate or water that may accumulate around the water heater, thus preventing potential overflow or water damage. Additionally, having the drain at this height ensures compliance with plumbing codes, which often dictate minimum drainage heights to maintain safety and efficacy in installations. Water heaters can generate a significant amount of condensation, especially in certain climates, and if the drain were placed higher than 3 inches, it could result in improper water flow and drainage issues, leading to maintenance challenges. Thus, the 3-inch requirement represents a balance between effective drainage and adherence to plumbing regulations, making it the most appropriate choice in this context.