10 CFR § 431.87 - Energy conservation standards and their effective dates.

---
identifier: "/us/cfr/t10/s431.87"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "10 CFR § 431.87 - Energy conservation standards and their effective dates."
title_number: 10
title_name: "Energy"
section_number: "431.87"
section_name: "Energy conservation standards and their effective dates."
chapter_name: "DEPARTMENT OF ENERGY"
subchapter_number: "D"
subchapter_name: "ENERGY CONSERVATION"
part_number: "431"
part_name: "ENERGY EFFICIENCY PROGRAM FOR CERTAIN COMMERCIAL AND INDUSTRIAL EQUIPMENT"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 6291-6317; 28 U.S.C. 2461 note."
regulatory_source: "64 FR 54141, Oct. 5, 1999, unless otherwise noted."
cfr_part: "431"
---


# 431.87 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. |
| Hot Water Commercial Packaged Boilers | Gas-fired | >2,500,000 Btu/h | 82.0% E. |
| Hot Water Commercial Packaged Boilers | Oil-fired | ≥300,000 Btu/h and ≤2,500,000 Btu/h | 82.0% E. |
| Hot Water Commercial Packaged Boilers | Oil-fired | >2,500,000 Btu/h | 84.0% E. |
| Steam Commercial Packaged Boilers | Gas-fired, all, except natural draft | ≥300,000 Btu/h and ≤2,500,000 Btu/h | 79.0% E. |
| Steam Commercial Packaged Boilers | Gas-fired, all, except natural draft | >2,500,000 Btu/h | 79.0% E. |
| Steam Commercial Packaged Boilers | Gas-fired—natural draft | ≥300,000 Btu/h and ≤2,500,000 Btu/h | 77.0% E. |
| Steam Commercial Packaged Boilers | Gas-fired—natural draft | >2,500,000 Btu/h | 77.0% E. |
| Steam Commercial Packaged Boilers | Oil-fired | ≥300,000 Btu/h and ≤2,500,000 Btu/h | 81.0% E. |
| Steam Commercial Packaged Boilers | Oil-fired | >2,500,000 Btu/h | 81.0% E. |
| * Where E is combustion efficiency and E 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. |
| Steam Commercial Packaged Boilers | Gas-fired—natural draft | >2,500,000 Btu/h | 79.0% E. |
| * Where E is thermal efficiency. |  |  |  |

[88 FR 64352, Sept. 19, 2023]