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64 FR 54141, Oct. 5, 1999, unless otherwise noted.
69 FR 61960, Oct. 21, 2004, unless otherwise noted.
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At 90 FR 43371, Sept. 9, 2025, as required by the Congressional Review Act and Pub. L. 119-8, the Department of Energy removed the amendments to several sections in part 431 made effective on Dec. 23, 2024, at 89 FR 91163, Oct. 9, 2024. As of Sept. 9, 2025, the affected sections reverted to the Dec. 22, 2024 version.
(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.
| 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% ET. |
| Hot Water Commercial Packaged Boilers | Gas-fired | >2,500,000 Btu/h | 82.0% EC. |
| Hot Water Commercial Packaged Boilers | Oil-fired | ≥300,000 Btu/h and ≤2,500,000 Btu/h | 82.0% ET. |
| Hot Water Commercial Packaged Boilers | Oil-fired | >2,500,000 Btu/h | 84.0% EC. |
| Steam Commercial Packaged Boilers | Gas-fired, all, except natural draft | ≥300,000 Btu/h and ≤2,500,000 Btu/h | 79.0% ET. |
| Steam Commercial Packaged Boilers | Gas-fired, all, except natural draft | >2,500,000 Btu/h | 79.0% ET. |
| Steam Commercial Packaged Boilers | Gas-fired—natural draft | ≥300,000 Btu/h and ≤2,500,000 Btu/h | 77.0% ET. |
| Steam Commercial Packaged Boilers | Gas-fired—natural draft | >2,500,000 Btu/h | 77.0% ET. |
| Steam Commercial Packaged Boilers | Oil-fired | ≥300,000 Btu/h and ≤2,500,000 Btu/h | 81.0% ET. |
| Steam Commercial Packaged Boilers | Oil-fired | >2,500,000 Btu/h | 81.0% ET. |
| * Where EC is combustion efficiency and ET 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.
| 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% ET. |
| Steam Commercial Packaged Boilers | Gas-fired—natural draft | >2,500,000 Btu/h | 79.0% ET. |
| * Where ET is thermal efficiency. | |||
[88 FR 64352, Sept. 19, 2023]