(a) Each commercial packaged boiler listed in Table 1 to §431.87 and manufactured on or after March 2, 2012 and prior to January 10, 2023, must meet the applicable energy conservation standard levels as follows:
Table 1 to §431.87—Commercial Packaged Boiler Energy Conservations Standards
| Equipment | Subcategory | Size category (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 ET means “thermal efficiency” and EC means “combustion efficiency” as defined in 10 CFR 431.82.
(b) Each commercial packaged boiler listed in Table 2 to §431.87 and manufactured on or after January 10, 2023, must meet the applicable energy conservation standard levels as follows:
Table 2 to §431.87—Commercial Packaged Boiler Energy Conservations Standards
| Equipment | Size category (rated input) |
Energy conservation standard |
|---|---|---|
| Small Gas-Fired Hot Water Commercial Packaged Boilers | ≥300,000 Btu/h and ≤2,500,000 Btu/h | 84.0% ET. |
| Large Gas-Fired Hot Water Commercial Packaged Boilers | >2,500,000 Btu/h and ≤10,000,000 Btu/h | 85.0% EC. |
| Very Large Gas-Fired Hot Water Commercial Packaged Boilers | >10,000,000 Btu/h | 82.0% EC. |
| Small Oil-Fired Hot Water Commercial Packaged Boilers | ≥300,000 Btu/h and ≤2,500,000 Btu/h | 87.0% ET. |
| Large Oil-Fired Hot Water Commercial Packaged Boilers | >2,500,000 Btu/h and ≤10,000,000 Btu/h | 88.0% EC. |
| Very Large Oil-Fired Hot Water Commercial Packaged Boilers | >10,000,000 Btu/h | 84.0% EC. |
| Small Gas-Fired Steam Commercial Packaged Boilers | ≥300,000 Btu/h and ≤2,500,000 Btu/h | 81.0% ET. |
| Large Gas-Fired Steam Commercial Packaged Boilers | >2,500,000 Btu/h and ≤10,000,000 Btu/h | 82.0% ET. |
| Very Large Gas-Fired Steam Commercial Packaged Boilers** | >10,000,000 Btu/h | 79.0% ET. |
| Small Oil-Fired Steam Commercial Packaged Boilers | ≥300,000 Btu/h and ≤2,500,000 Btu/h | 84.0% ET. |
| Large Oil-Fired Steam Commercial Packaged Boilers | >2,500,000 Btu/h and ≤10,000,000 Btu/h | 85.0% ET. |
| Very Large Oil-Fired Steam Commercial Packaged Boilers | >10,000,000 Btu/h | 81.0% ET. |
*Where ET means “thermal efficiency” and EC means “combustion efficiency” as defined in 10 CFR 431.82.
**Prior to March 2, 2022, for natural draft very large gas-fired steam commercial packaged boilers, a minimum thermal efficiency level of 77 percent is permitted and meets Federal commercial packaged boiler energy conservation standards.
[85 FR 1681, Jan. 10, 2020]
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