StacksVerified U.S. regulatory reference

40 CFR §63.11200

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The subcategories of boilers, as defined in § 63.11237 are:
  1. (a)Coal.
  2. (b)Biomass.
  3. (c)Oil.
  4. (d)Seasonal boilers.
  5. (e)Oil-fired boilers with heat input capacity of equal to or less than 5 million British thermal units (Btu) per hour.
  6. (f)Boilers with an oxygen trim system that maintains an optimum air-to-fuel ratio that would otherwise be subject to a biennial tune-up.
  7. (g)Limited-use boilers.