scope:

This standard applies to water heaters designed to be capable of providing outlet water at a controlled temperature of at least the nominal outlet water temperature under the conditions specified by this test.

This standard applies to the following subsections.

Electric heat-pump storage water heaters that

a. use electricity as the energy source,

b. have a nameplate input rating of 12 kW (40,956 Btu/h) or less,

c. have a rated storage capacity of 120 gal (450 L) or less,

d. are designed to transfer thermal energy from one temperature level to a higher temperature level for the purpose of heating water, and

e. are designed to heat and store water at a thermostatically controlled temperature less than or equal to 180°F (82°C).

Electric instantaneous water heaters that

a. use electricity as the energy source,

b. have a nameplate input rating of 58.6 kW (200,000 Btu/h) or less,

c. contain no more than one gallon of water per 4000 Btu per hour (3.2 litres of water per kilowatt) of input, and

d. are designed to provide outlet water at a controlled temperature less than or equal to 180°F (82°C).

Electric storage water heaters that

a. use electricity as the energy source,

b. have a nameplate input rating of 12 kW (40,956 Btu/h) or less,

c. have a rated storage capacity of 120 gal (450 L) or less,

d. contain more than one gallon of water per 4000 Btu per hour (3.2 litres of water per kilowatt) of input, and

e. are designed to heat and store water at a thermostatically controlled temperature less than or equal to 180°F (82°C).

Gas-fired heat-pump storage water heaters that

a. use gas as the main energy source,

b. have a nameplate input rating of 20,000 Btu/h (26.4 MJ/h) or less,

c. have a maximum current rating of 24 amp (including all auxiliary equipment, such as fans, pumps, controls, and, if on the same circuit, any resistive elements) at an input voltage of no greater than 250 V,

d. have a rated storage volume not more than 120 gal (450 L), and

e. are designed to transfer thermal energy from one temperature level to a higher temperature level to deliver water at a thermostatically controlled temperature less than or equal to 180°F (82°C).

Gas-fired instantaneous water heaters that

a. use gas as the main energy source,

b. have a nameplate input rating less than 200,000 Btu/h (210 MJ/h),

c. contain no more than one gallon of water per 4000 Btu per hour (3.2 litres of water per kilowatt) of input, and

d. are designed to provide outlet water at a controlled temperature less than or equal to 180°F (82°C).

Gas-fired storage water heaters that

a. use gas as the main energy source,

b. have a nameplate input rating of 105,000 Btu/h (110 MJ/h) or less,

c. have a rated storage capacity of 120 gal (450 L) or less,

d. contain more than one gallon of water per 4000 Btu per hour (3.2 litres of water per kilowatt) of input, and

e. are designed to heat and store water at a thermostatically-controlled temperature less than or equal to 180°F (82°C).

Oil-fired instantaneous water heaters that

a. use oil as the main energy source,

b. have a nameplate input rating of 210,000 Btu/h (220 MJ/h) or less,

c. contain no more than one gallon of water per 4000 Btu per hour (3.2 litres of water per kilowatt) of input, and

d. are designed to provide outlet water at a controlled temperature less than or equal to 180°F (82°C).

Oil-fired storage water heaters that

a. use oil as the main energy source,

b. have a nameplate input rating of 140,000 Btu/h (148 MJ/h) or less,

c. have a rated storage capacity of 120 gal (450 L) or less,

d. contain more than one gallon of water per 4000 Btu per hour (3.2 litres of water per kilowatt) of input, and

e. are designed to heat and store water at a thermostatically-controlled temperature less than or equal to 180°F (82°C).