(a) In this section, "residential water heater" means a water heater that:
(1) is designed primarily for residential use; and
(2) has a maximum rated capacity of 75,000 British thermal units per hour (Btu/hr) or less.
(b) Repealed by Acts 2007, 80th Leg., R.S., Ch. 49, Sec. 2, eff. May 8, 2007.
(c) Repealed by Acts 2007, 80th Leg., R.S., Ch. 49, Sec. 2, eff. May 8, 2007.
(d) The commission may not adopt or enforce a rule, determination, or order that relates to emissions of residential water heaters that is below 40 nanograms of NOx per joule unless a lower standard is established by a federal statute or rule. Any commission rule, determination, or order existing on or before the effective date of this subsection related to emission specifications for residential water heaters that is more stringent than the 40 nanograms of NOx per joule standard is hereby repealed.