Sources
Does Colorado's NOx rule affect a replacement boiler?
- Colorado General Assembly, HB23-1161 (enacted 2023), bill page
https://leg.colorado.gov/bills/hb23-1161 - C.R.S. § 25-7-1502, definitions, including "water heater" (210°F, 160 psig)
https://colorado.public.law/statutes/crs_25-7-1502 - C.R.S. § 25-7-1503, scope
https://colorado.public.law/statutes/crs_25-7-1503 - C.R.S. § 25-7-1504, emission limits (10 ng/J, 14 ng/J) and ENERGY STAR deemed compliance
https://colorado.public.law/statutes/crs_25-7-1504 - Legislative Council Staff, HB23-1161 final fiscal note ("new water heaters, boilers, and certain furnaces")
https://leg.colorado.gov/sites/default/files/documents/2023A/bills/fn/2023a_hb1161_f1.pdf - PHCC, "Ultra-Low NOx Policies for Boilers and Water Heaters Serving as New Political Football" (April 23, 2025): "Boilers are exempt from this legislation."
https://www.phccweb.org/news/ultra-low-nox-policies-for-boilers-and-water-heaters-serving-as-new-political-football/ - Colorado General Assembly, SB26-002 Energy Affordability (signed June 2, 2026; effective August 12, 2026)
https://leg.colorado.gov/bills/sb26-002