Louisiana Administrative Code
Title 55 - PUBLIC SAFETY
Part V - Fire Protection
Chapter 50 - Boiler Construction, Maintenance, Inspection and General Use
Subchapter D - Potable Water Heaters (Hot Water Heaters Other than Hot Water Supply Boilers)
Section V-5052 - Service Restrictions and Exceptions

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.

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.

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.

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.