# 10 C.F.R. § 431.86 (2026): Uniform test method for the measurement of energy efficiency of commercial packaged boilers

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/CFR_T10_P431_S431_86

## Section

- **Citation:** 10 C.F.R. § 431.86 (2026)
- **Heading:** Uniform test method for the measurement of energy efficiency of commercial packaged boilers
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Title 10 CFR: Energy / Chapter II: DEPARTMENT OF ENERGY / Part 431: ENERGY EFFICIENCY PROGRAM FOR CERTAIN COMMERCIAL AND INDUSTRIAL EQUIPMENT / Subpart E: Commercial Packaged Boilers / § 431.86: § 431.86   Uniform test method for the measurement of energy efficiency of commercial packaged boilers.

## Text

(a)
Scope.
This section provides test procedures, pursuant to the Energy Policy and Conservation Act (EPCA), as amended, which must be followed for measuring the combustion efficiency and/or thermal efficiency of a gas- or oil-fired commercial packaged boiler.
(b)
Testing and Calculations.
Determine the thermal efficiency or combustion efficiency of commercial packaged boilers by conducting the appropriate test procedure(s) indicated in Table 1 of this section.
Table 1—Test Requirements for Commercial Packaged Boiler Equipment Classes
Equipment category
Subcategory
Certified rated input
Btu/h
Standards efficiency metric
(§ 431.87)
Test procedure
(corresponding to
standards efficiency
metric required
by § 431.87)
Hot Water
Gas-fired
≥300,000 and ≤2,500,000
Thermal Efficiency
Appendix A, Section 2.
Hot Water
Gas-fired
>2,500,000
Combustion Efficiency
Appendix A, Section 3.
Hot Water
Oil-fired
≥300,000 and ≤2,500,000
Thermal Efficiency
Appendix A, Section 2.
Hot Water
Oil-fired
>2,500,000
Combustion Efficiency
Appendix A, Section 3.
Steam
Gas-fired (all*)
≥300,000 and ≤2,500,000
Thermal Efficiency
Appendix A, Section 2.
Steam
Gas-fired (all*)
>2,500,000 and ≤5,000,000
Thermal Efficiency
Appendix A, Section 2.
>5,000,000
Thermal Efficiency
Appendix A, Section 2.
OR
Appendix A, Section 3 with Section 2.4.3.2.
Steam
Oil-fired
≥300,000 and ≤2,500,000
Thermal Efficiency
Appendix A, Section 2.
Steam
Oil-fired
>2,500,000 and ≤5,000,000
Thermal Efficiency
Appendix A, Section 2.
>5,000,000
Thermal Efficiency
Appendix A, Section 2.
OR
Appendix A, Section 3. with Section 2.4.3.2.
* Equipment classes for commercial packaged boilers as of July 22, 2009 (74 FR 36355) distinguish between gas-fired natural draft and all other gas-fired (except natural draft).
(c)
Field Tests.
The field test provisions of appendix A may be used only to test a unit of commercial packaged boiler with rated input greater than 5,000,000 Btu/h.
[81 FR 89305, Dec. 9, 2016]

## Nearby sections

- [10 C.F.R. § 431.81 (2026) § 431.81   Purpose and scope.](https://www.frixlaw.com/law-library/statutes/CFR_T10_P431_S431_81.md)
- [10 C.F.R. § 431.82 (2026) § 431.82   Definitions concerning commercial packaged boilers.](https://www.frixlaw.com/law-library/statutes/CFR_T10_P431_S431_82.md)
- [10 C.F.R. § 431.85 (2026) § 431.85   Materials incorporated by reference.](https://www.frixlaw.com/law-library/statutes/CFR_T10_P431_S431_85.md)
- [10 C.F.R. § 431.86 (2026) § 431.86   Uniform test method for the measurement of energy efficiency of commercial packaged boilers.](https://www.frixlaw.com/law-library/statutes/CFR_T10_P431_S431_86.md)
- [10 C.F.R. § 431.87 (2026) § 431.87   Energy conservation standards and their effective dates.](https://www.frixlaw.com/law-library/statutes/CFR_T10_P431_S431_87.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/CFR_T10_P431_S431_86. Check the current official text before relying on it. Not legal advice.