The Capped TPR and the Garage Water Heater
At a 2015 house, the inspector examines a 50-gallon gas-fired water heater in the attached garage. The TPR valve has a ¾-inch copper discharge pipe that terminates 18 inches above the garage floor with a threaded end capped. The single-wall metal flue rises 4 feet and passes within 2 inches of wood roof framing; the label calls for 6 inches clearance to combustibles for single-wall pipe. The gas supply has a flexible connector but no sediment trap. The water heater sits directly on the concrete floor with no pan. The inspector runs hot water at the kitchen sink; it reaches 118°F in 90 seconds. The burner fires and the draft hood shows no spillage during a 3-minute observation. The buyer asks whether the water heater is “going to explode” and whether the inspector should test the TPR valve. The inspection agreement excludes testing TPR valves and says the inspector will report visible safety defects.
1. Which conditions should be reported as safety concerns, and how should they be prioritized?
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Report the TPR termination and flue clearance as priority safety concerns. The capped TPR discharge pipe ending 18 inches above the floor is defective: a TPR valve must be able to discharge freely, and a cap can block relief. The single-wall flue with 2 inches’ clearance to wood framing, where the label requires 6 inches, is a fire hazard. The missing sediment trap and absence of a pan are also reportable, but lower priority; the garage location and concrete floor affect the pan issue. Reasoning: the inspector should describe each condition, its location, and why it matters, then recommend a licensed plumber/HVAC contractor evaluate and repair. The 118°F hot-water reading and lack of draft-hood spillage are useful observations but do not cancel the defects. Avoid telling the buyer it will “explode”; state the risk of pressure relief blockage and fire, and recommend prompt correction.
2. Should the inspector test the TPR valve? Explain the answer in SOP and risk terms.
Read the worked answer
No-do not test the TPR valve. The inspection agreement excludes TPR testing, and operating an old or corroded valve can cause it to stick open or leak. The visible defect-capped discharge terminating 18 inches above the floor-is enough to report and refer. The inspector can explain that the valve’s proper function was not tested and that a plumber should evaluate/replace it. Reasoning: SOPs commonly exclude testing TPR valves because the test can create a water leak or injury risk; the inspector’s duty is to report visible defects and limitations, not to repair or prove the valve works. If the inspector did test it, the report would need to state the result and any leakage. Here, the safer and more defensible course is to document the defect and recommend correction by a qualified plumber.