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Each heated water storage tank shall be provided with a sludge drain pipe which shall be connected at the lowest level of the bottom section of the tank. This drain shall be provided with a control valve with a clear waterway equal to the area of the sludge drain pipe, and shall discharge through an indirect connection into the drainage system of the building. Drain valves shall conform to ASSE 1005.
All water heaters shall be third-party certified. Listing by Underwriters Laboratories, CSA International or the National Board of Boiler and Pressure Vessel Inspectors shall constitute evidence of conformance with these standards.
(Amend Coun. J. 10-14-21, p. 37722, Art. V, § 1)
The temperature of water from tankless water heaters shall be a maximum of 140°F (60°C) when intended for domestic uses. This provision shall not supersede the requirement for protective shower valves in accordance with Section 18-29-424.3.
(Amend Coun. J. 10-14-21, p. 37722, Art. V, § 2)
Indirect, external, tankless or submerged coils used in heating water shall be equipped with a thermostatic mixing valve or valves when not connected to a storage tank. A pressure relief valve or expansion tank shall be installed on the cold water inlet to the heater. A temperature and pressure relief valve shall be installed on the tempered line with the temperature sensing element immersed in the tempered water pipe as close as possible to the mixing valve.
Storage tanks and water heaters installed for domestic hot water shall have the maximum allowable working pressure clearly and indelibly stamped in the metal or marked on a plate welded thereto or otherwise permanently attached. Such markings shall be in an accessible position outside of the tank so as to make inspection or reinspection readily possible.
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