Storage water heater

means a water heater that is regulated under 10 C.F.R. part 431 and that uses gas, oil, or electricity to heat and store water within the appliance at a thermostatically controlled temperature for delivery on demand, including:

(1) gas-fired ‘storage water heaters with a rated input both greater than 75,000 Btu/hour and less than 4,000 Btu/hour per gallon of stored water;

(2) oil-fired storage ‘water heaters with a rated input both greater than 105,000 Btu/hour and less than 4,000 Btu/hour per gallon of stored water; and

(3) electric storage water heaters with a rated input both greater than 12 kW and less than 4,000 Btu/hour per gallon of stored water.