1. A. Potable water heaters supplying potable hot water
   for commercial purposes that exceed a heat input of
   200,000 BTU per hour or a nominal water-containing capacity of 120 gallons, shall be designed, constructed, inspected and stamped in conformity with Part HLW of the ASME Code, Section IV.
2. B. Potable water heaters supplying potable hot water for commercial purposes that do not exceed a heat input of 200,000 BTU per hour or a nominal water-containing capacity of 120 gallons, but has a nominal water-containing capacity of 50 gallons, shall be designed and constructed to underwriters laboratories or other nationally recognized standard and shall bear their label on the completed unit.
3. C. All other potable water heaters not otherwise exempted by the Act, shall be designed and constructed to underwriters laboratories or other nationally recognized standard and shall bear their label on the completed unit.
4. D. The maximum allowable working pressure of a potable water heater shall in no case exceed the pressure indicated by the manufacturer's identification stamped or cast on the heater or a plate or label secured to it. In no case shall the maximum allowable working pressure of a potable water heater exceed 160 psi or a water temperature of
   210° F.

Authority Note

AUTHORITY NOTE: Promulgated in accordance with R.S. 23:531 and R.S. 51:1424.

Historical Note

HISTORICAL NOTE: Promulgated by the Department of Public Safety, Office of State Fire Marshal, LR 33:1364 (July 2007).