18-29-503.1.1 Shutoff valves.

   Shutoff valves for water heaters or heated water storage tanks may be installed on the inlet side only. This discharge side may be provided with a check valve or a three-way valve installed to open the heater to the atmosphere when it is not in the operating position. The atmospheric opening of a three-way valve shall be indirectly connected to the drainage system.

18-29-503.2 Deliberately omitted.

18-29-504 Safety Devices.

18-29-504.1 Antisiphon devices.

   An approved means shall be provided to prevent siphoning of any storage water heater or tank. A cold water "dip" tube with a hole at the top or a vacuum relief valve installed in the cold water supply line above the top of the heater or tank shall be approved for this purpose. Such a device shall be installed on any water heater or heated water storage tank that supplies a water outlet below the level of the heater.

18-29-504.2 Vacuum relief valve.

   Water heaters elevated above the fixtures they serve and tanks connected to such water heaters shall have a vacuum relief valve installed. The vacuum relief valve shall comply with ANSI Z21.22.

(Amend Coun. J. 3-27-02, p. 82090, § 3)

18-29-504.3 Energy cutoff device.

   All automatically controlled water heaters shall be equipped with an energy cutoff device that will cut off the supply of heat energy to the water tank before the temperature of the water in the tank exceeds 200°F (93.3°C). This cutoff device shall be required in addition to the temperature and pressure relief valves.

18-29-504.4 Shutdown.

   A separate switch shall be provided to terminate the energy supplied to electric hot water supply systems. A separate valve shall be provided to turn off the energy supplied to the main burner of all other types of hot water supply systems.