§ 431.87 Energy conservation standards and their effective dates.
Current through Oct 5, 2026 · Read all of Part 431
(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% 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.
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% 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]