Section 119.320 - Water heaters(a) A water heater must meet the requirements of Parts 53 and 63 in subchapter F of this chapter if rated at not more than 689 kPa (100 psig) and 121 °C (250 °F), except that an electric water heater is also acceptable if it:(1) Has a capacity of not more than 454 liters (120 gallons):(2) Has a heat input of not more than 58.6 kilowatts (200,000 Btu per hour);(3) Is listed by Underwriters Laboratories (UL) under UL 174, "Household Electric Storage Tank Water Heaters," UL 1453, "Electric Booster and Commercial Storage Tank Water Heaters," or other standard specified by the Commandant; and(4) Is protected by a pressure-temperature relief device.(b) A water heater must meet the requirements of Parts 52 and 63 in subchapter F of this chapter if rated at more than 689 kPa (100 psig) or 121 °C (250 °F).(c) A water heater must be installed and secured from rolling by straps or other devices to the satisfaction of the cognizant OCMI.CGD 85-080, 61 FR 922, Jan. 10, 1996, as amended at 62 FR 51352, Sept. 30, 1997