15A-6-102. Nitrogen Oxide emission limits for natural gas-fired water heaters.
| (1) |
As used in this section:
Terms Used In Utah Code 15A-6-102- Person: means :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
| (a) |
“BTU” means British Thermal Unit. |
| (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. |
| (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 |
|
|
| (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. |
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Amended by Chapter 136, 2020 General Session
