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Potable water heaters and hot water storage tanks shall be listed, labeled and installed in accordance with the manufacturer's installation instructions, the plumbing code and the building code. Potable hot water storage tanks heated by indirect means shall be designed, constructed, and installed in accordance with Section VIII of the ASME Code unless all of the following requirements are met:
1. The storage tank has a heat input of less than 200,000 BTU/hr.
2. The storage tank has a capacity of less than 120 gallons.
3. The storage tank maximum operating temperature is less than 210°F (99°C).
Potable hot water storage tanks heated by indirect means that meet all three of the above requirements shall be governed by the plumbing code.
All water heaters shall be capable of being removed without first having to remove a permanent portion of the building structure. The potable water connections and relief valves for all water heaters shall conform to the requirements of the plumbing code. Water heaters with open flames that use combustion air from a machinery room shall not be installed in a machinery room except as allowed in Article 11, Refrigeration, Section 18-28-1105.