Federal regulations · Through 2026-08-25 · Newer source version available

10 CFR 431.86: Uniform test method for the measurement of energy efficiency of commercial packaged boilers.

(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.

Where this section sits in the code

Title 10—Energy
CHAPTER II—DEPARTMENT OF ENERGY
SUBCHAPTER D—ENERGY CONSERVATION
PART 431—ENERGY EFFICIENCY PROGRAM FOR CERTAIN COMMERCIAL AND INDUSTRIAL EQUIPMENT
Subpart E—Commercial Packaged Boilers

(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.

Collected 2026-08-27T02:24:09Z. Source file · JSON

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