(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 [deg]C (250 [deg]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 [deg]C (250 [deg]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]