Superseded 7/1/2026

639 words·~3 min read·/ut/title-15a/chapter-6/7

A research copy — for the controlling text, always check the official state or federal source. Not legal advice.

Effective 7/1/2020

Superseded 7/1/2026

15A-6-102. Nitrogen Oxide emission limits for natural gas-fired water heaters.

(1)As used in this section:

(a)"BTU" means British Thermal Unit.

(i)"Heat input" means the heat of combustion released by fuel burned in a water heater based on the heating value of the fuel.

(ii)"Heat input" does not include the enthalpy of a water heater's incoming combustion air.

(c)"Heat output" means the enthalpy of a water heater's working fluid output.

(d)"Natural gas-fired water heater" means a device that heats water:

(i)using natural gas combustion;

(ii)for use external to the device at a pressure that is less than or equal to 160 pounds per square inch gage; and

(iii)to a thermostatically controlled temperature less than or equal to:

(A)210 degrees Fahrenheit; or

(B)99 degrees Celsius.

(e)"ppm" means parts of Nitrogen Oxide per million parts of water heater air output.

(f)"Recreational vehicle" means the same as that term is defined in Section 13-14-102 .

(2)On and after July 1, 2018, a person may not sell or install a natural gas-fired water heater with an emission rate greater than the following limits:

(a)except as provided in Subsection

(6), for a water heater that has a heat input of less than or equal to 75,000 BTU per hour that is not installed in a mobile home, a limit of:

(i)10 nanograms per Joule of heat output; or

(ii)15 ppm, corrected to 3% oxygen;

(b)for a water heater that has a heat input of greater than 75,000 BTU per hour and less than 2,000,000 BTU per hour that is not installed in a mobile home, a limit of:

(i)14 nanograms per Joule of heat output; or

(ii)20 ppm, corrected to 3% oxygen;

(c)for a water heater installed in a mobile home, a limit of:

(i)40 nanograms per Joule of heat output; or

(ii)55 ppm, corrected to 3% oxygen;

(d)for a pool or spa water heater with a heat input that is less than or equal to 400,000 BTU per hour, a limit of:

(i)40 nanograms per Joule of heat output; or

(ii)55 ppm, corrected to 3% oxygen; and

(e)for a pool or spa water heater with a heat input of greater than 400,000 BTU per hour and less than 2,000,000 BTU per hour, a limit of:

(i)14 nanograms per Joule of heat output; or

(ii)20 ppm, corrected to 3% oxygen.

(3)A water heater manufacturer shall use California South Coast Air Quality Management District Method 100.1 to calculate the emissions rate of a water heater subject to this section.

(4)A water heater manufacturer shall display on a water heater subject to this section, as a permanent label, the model number and the Nitrogen Oxide emission rate of the water heater.

(5)The requirements of this section do not apply to:

(a)a water heater using a fuel other than natural gas;

(b)a water heater used in a recreational vehicle;

(c)a water heater manufactured in the state for sale and shipment outside of the state; or

(d)a water heater manufactured before July 1, 2018.

(6)A person may sell or install a natural gas-fired water heater with an emission rate greater than the limits established in Subsection (2)(a) if:

(a)the water heater is replacing a water heater of equal BTUs per hour;

(b)there is not available for purchase in the United States a water heater that:

(i)has an input of equal BTUs per hour as the water heater being replaced; and

(ii)meets the limits established in Subsection (2)(a) ; and

(c)the purpose of the water heater is to heat water and provide space heating.

Amended by Chapter 136 , 2020 General Session