Utah Code 15A-6-102. Nitrogen Oxide emission limits for natural gas-fired water heaters
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(1) As used in this section:
Terms Used In Utah Code 15A-6-102
- Equal: means , with respect to biological sex, of the same value. See Utah Code 68-3-12.5
- Person: means :(24)(a) an individual;(24)(b) an association;(24)(c) an institution;(24)(d) a corporation;(24)(e) a company;(24)(f) a trust;(24)(g) a limited liability company;(24)(h) a partnership;(24)(i) a political subdivision;(24)(j) a government office, department, division, bureau, or other body of government; and(24)(k) any other organization or entity. See Utah Code 68-3-12.5
- State: when applied to the different parts of the United States, includes a state, district, or territory of the United States. See Utah Code 68-3-12.5
- United States: includes each state, district, and territory of the United States of America. See Utah Code 68-3-12.5
(1)(a) “BTU” means British Thermal Unit.(1)(b)(1)(b)(i) “Heat input” means the heat of combustion released by fuel burned in a water heater based on the heating value of the fuel.(1)(b)(ii) “Heat input” does not include the enthalpy of a water heater’s incoming combustion air.(1)(c) “Heat output” means the enthalpy of a water heater’s working fluid output.(1)(d) “Natural gas-fired water heater” means a device that heats water:(1)(d)(i) using natural gas combustion;(1)(d)(ii) for use external to the device at a pressure that is less than or equal to 160 pounds per square inch gage; and(1)(d)(iii) to a thermostatically controlled temperature less than or equal to:(1)(d)(iii)(A) 210 degrees Fahrenheit; or(1)(d)(iii)(B) 99 degrees Celsius.(1)(e) “ppm” means parts of Nitrogen Oxide per million parts of water heater air output.(1)(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:
(2)(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:
(2)(a)(i) 10 nanograms per Joule of heat output; or
(2)(a)(ii) 15 ppm, corrected to 3% oxygen;
(2)(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:
(2)(b)(i) 14 nanograms per Joule of heat output; or
(2)(b)(ii) 20 ppm, corrected to 3% oxygen;
(2)(c) for a water heater installed in a mobile home, a limit of:
(2)(c)(i) 40 nanograms per Joule of heat output; or
(2)(c)(ii) 55 ppm, corrected to 3% oxygen;
(2)(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:
(2)(d)(i) 40 nanograms per Joule of heat output; or
(2)(d)(ii) 55 ppm, corrected to 3% oxygen; and
(2)(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:
(2)(e)(i) 14 nanograms per Joule of heat output; or
(2)(e)(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:
(5)(a) a water heater using a fuel other than natural gas;
(5)(b) a water heater used in a recreational vehicle;
(5)(c) a water heater manufactured in the state for sale and shipment outside of the state; or
(5)(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:
(6)(a) the water heater is replacing a water heater of equal BTUs per hour;
(6)(b) there is not available for purchase in the United States a water heater that:
(6)(b)(i) has an input of equal BTUs per hour as the water heater being replaced; and
(6)(b)(ii) meets the limits established in Subsection (2)(a); and
(6)(c) the purpose of the water heater is to heat water and provide space heating.