Energy conservation standards and their effective dates.

(a) Each commercial packaged boiler listed in table 1 of this paragraph (a) and manufactured on or after the effective date listed must meet the indicated energy conservation standard. Table 1 to Paragraph (a) —Commercial Packaged Boiler Energy Conservation Standards Equipment category Subcategory Certified rated input Efficiency level—effective date: March 2, 2012 * Hot Water Commercial Packaged Boilers Gas-fired ≥300,000 Btu/h and ≤2,500,000 Btu/h 80.0% E T . Hot Water Commercial Packaged Boilers Gas-fired >2,500,000 Btu/h 82.0% E C . Hot Water Commercial Packaged Boilers Oil-fired ≥300,000 Btu/h and ≤2,500,000 Btu/h 82.0% E T . Hot Water Commercial Packaged Boilers Oil-fired >2,500,000 Btu/h 84.0% E C . Steam Commercial Packaged Boilers Gas-fired, all, except natural draft ≥300,000 Btu/h and ≤2,500,000 Btu/h 79.0% E T . Steam Commercial Packaged Boilers Gas-fired, all, except natural draft >2,500,000 Btu/h 79.0% E T . Steam Commercial Packaged Boilers Gas-fired—natural draft ≥300,000 Btu/h and ≤2,500,000 Btu/h 77.0% E T . Steam Commercial Packaged Boilers Gas-fired—natural draft >2,500,000 Btu/h 77.0% E T . Steam Commercial Packaged Boilers Oil-fired ≥300,000 Btu/h and ≤2,500,000 Btu/h 81.0% E T . Steam Commercial Packaged Boilers Oil-fired >2,500,000 Btu/h 81.0% E T . * Where E C is combustion efficiency and E T is thermal efficiency. (b) Each commercial packaged boiler listed in table 2 of this paragraph (b) and manufactured on or after the effective date listed in Table 2 must meet the indicated energy conservation standard. Table 2 to Paragraph (b) —Commercial Packaged Boiler Energy Conservation Standards Equipment category Subcategory Certified rated input Efficiency level—effective date: March 2, 2022 * Steam Commercial Packaged Boilers Gas-fired—natural draft ≥300,000 Btu/h and ≤2,500,000 Btu/h 79.0% E T . Steam Commercial Packaged Boilers Gas-fired—natural draft >2,500,000 Btu/h 79.0% E T . * Where E T is thermal efficiency. [88 FR 64352, Sept. 19, 2023]