(a) Natural gas-fired boilers and process heaters sold, distributed, installed, or offered for sale within the State of Texas must meet the following specifications for nitrogen oxides (NOX ).
  (1) Type 0 units manufactured on or after July 1, 2002, but no later than December 31, 2004, must not exceed:
    (A) 40 nanograms per joule (ng/J) of heat output; or
    (B) 55 parts per million by volume (ppmv) at 3.0% oxygen (O2), dry.
  (2) Type 0 units manufactured on or after January 1, 2005, must not exceed:
    (A) 10 ng/J of heat output; or
    (B) 15 ppmv at 3.0% O2, dry.
  (3) Type 1 units manufactured on or after July 1, 2002, must not exceed:
    (A) 40 ng/J of heat output; or
    (B) 55 ppmv at 3.0% O2, dry.
  (4) Type 2 units manufactured on or after July 1, 2002, must not exceed:
    (A) 30 ppmv at 3.0% O2, dry; or
    (B) 0.037 pounds per million British thermal units (lb/MMBtu) of heat input.
(b) Natural gas-fired water heaters sold, distributed, installed, or offered for sale within the State of Texas must meet the following specifications for NOX .
  (1) Type 0 units manufactured on or after July 1, 2002, must not exceed:
    (A) 40 ng/J of heat output; or
    (B) 55 ppmv at 3.0% O2, dry.
  (2) Type 1 units manufactured on or after July 1, 2002, must not exceed:
    (A) 40 ng/J of heat output; or
    (B) 55 ppmv at 3.0% O2, dry.
  (3) Type 2 units manufactured on or after July 1, 2002, must not exceed:
    (A) 30 ppmv at 3.0% O2, dry; or
    (B) 0.037 lb/MMBtu of heat input.

Source Note: The provisions of this §117.3205 adopted to be effective June 14, 2007, 32 TexReg 3206