Section R307-230-5 - Standards(1) No person shall sell or install any natural gas-fired water heater with an emission rate exceeding the limits described in R307-230-5(1)(a). (a) Subsections R307-230-5(1)(i) -(v) provide the NO x emission limits for natural gas-fired water heaters. (i) Water heaters up to 75,000 BTU/hr, excluding those in mobile homes: 10 ng/Joule of heat output or 15 ppm at 3% O 2.(ii) Water heaters 75,001-2,000,000 BTU/hr: 14 ng/Joule of heat output or 20 pmm at 3% O2.(iii) Mobile home water heaters: 40 ng/Joule of heat output or 55 ppm at 3% O2.(iv) Pool/spa heaters less than or equal to 400,000 BTU/hr: 40 ng/Joule of heat output or 55 ppm at 3% O2.(v) Pool/spa heaters 400,001-2,000,000 BTU/hr: 14 ng/Joule of heat output or 20 pmm at 3% O2.(2) The water heater manufacturer shall display the model number on each unit and the appropriate NOx emission rating on a permanent label on each unit.(3) Manufacturers shall use SCAQMD Method 100-1 to comply with the NOx standards in R307-230-5(1)(a).Utah Admin. Code R307-230-5
Adopted by Utah State Bulletin Number 2015-23, effective 11/3/2015