Under the UPC as adopted in Washington, which of these correctly describes where a water heater's T&P relief valve discharge pipe may end?
Not quite. The answer is D: Through an air gap into the drainage system, or outside the building ending 6 inches to 2 feet above the ground and pointing down
The discharge pipe must run full size, straight and rigid, with no valve, trap or threaded end, and must end where a release is readily seen and cannot scald or damage anything — either through an air gap into the drainage system or outdoors with the open end 6 inches to 2 feet above grade, pointing down. Washington's text expressly prohibits discharging into the water heater pan. For a replacement heater where no drain was provided, a downward pipe ending between 6 inches and 2 feet from the floor is accepted.
Trade Code Wizard is not affiliated with, endorsed by, or licensed by the International Code Council (ICC), the National Fire Protection Association (NFPA), IAPMO, the ESCO Institute, NATE, HVAC Excellence, NASCLA, NICET, the U.S. Environmental Protection Agency, PSI, Prov, Pearson VUE, or any state or local licensing board. Exam and code names are used only to identify which examination this study material prepares you for.
These are original practice questions written to publicly published exam content outlines. They are not actual exam questions, and they do not reproduce code text. Explanations cite code sections and state requirements in our own words — always verify against the code edition your jurisdiction has adopted, which may differ from the edition cited here.
Passing is not guaranteed. This is study material, not a substitute for the adopted code, for your licensing board's requirements, or for qualified instruction.