Fixtures & Water HeatersQuestion 174 of 360
When a T&P relief discharge terminates to an indoor location such as a floor drain or pan, an air gap is required. Where must that air gap be located?
a.At the point of discharge, so the pipe does not connect directly to a drain
b.Inside the water heater tank
c.Only at the water heater cold inlet
d.At the gas control valve
Explanation
The relief discharge must terminate through an air gap at the receptor so it is never directly connected to the drainage system. A direct connection could siphon sewer gases or block discharge. The air gap keeps the relief outlet open to atmosphere and visible.
Law Reference: 2022 California Plumbing Code (CPC) §608.5Practice all 360 questions free — no signup required.
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