CODE SNIPPET
10.16.7 Vacuum Relief Valves for Water Heaters
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- Where water distribution piping can siphon water from a water heater and cause dry-firing, a vacuum relief valve shall be installed on the cold water inlet piping to the water heater.
- Vacuum relief valves shall comply with ANSI Z21.22/CSA 4.4 and be rated for not less than 210°F.
- Vacuum relief valves shall be installed at an elevation above the top of the heater tank, downstream of the shutoff valve.
- Vacuum relief valves shall be installed in the vertical, upright position unless otherwise permitted by the manufacturer's instructions.
- Vacuum relief valves size shall be 3/4" minimum nominal pipe size.
EXCEPTION: Where water heater inlet piping is smaller than 3/4" nominal pipe size, 1/2" vacuum relief valves shall be required.
See Figure 10.16.7
Figure 10.16.7
VACUUM RELIEF VALVES ON OVERHEAD WATER HEATER TANKS
VACUUM RELIEF VALVES ON OVERHEAD WATER HEATER TANKS
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