{"data":{"id":"us/10-cfr-431.86","jurisdiction":"us","citation":"10 CFR 431.86","heading":"Uniform test method for the measurement of energy efficiency of commercial packaged boilers.","body":"(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.\n(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.\nTable 1—Test Requirements for Commercial Packaged Boiler Equipment Classes\nEquipment category Subcategory Certified rated input Btu/h Standards efficiency metric (§ 431.87) Test procedure (corresponding to standards efficiency metric required by § 431.87)\nHot Water Gas-fired ≥300,000 and ≤2,500,000 Thermal Efficiency Appendix A, Section 2.\nHot Water Gas-fired \u003e2,500,000 Combustion Efficiency Appendix A, Section 3.\nHot Water Oil-fired ≥300,000 and ≤2,500,000 Thermal Efficiency Appendix A, Section 2.\nHot Water Oil-fired \u003e2,500,000 Combustion Efficiency Appendix A, Section 3.\nSteam Gas-fired (all*) ≥300,000 and ≤2,500,000 Thermal Efficiency Appendix A, Section 2.\nSteam Gas-fired (all*) \u003e2,500,000 and ≤5,000,000 Thermal Efficiency Appendix A, Section 2.\n\u003e5,000,000 Thermal Efficiency Appendix A, Section 2. OR Appendix A, Section 3 with Section 2.4.3.2.\nSteam Oil-fired ≥300,000 and ≤2,500,000 Thermal Efficiency Appendix A, Section 2.\nSteam Oil-fired \u003e2,500,000 and ≤5,000,000 Thermal Efficiency Appendix A, Section 2.\n\u003e5,000,000 Thermal Efficiency Appendix A, Section 2. OR Appendix A, Section 3. with Section 2.4.3.2.\n* 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).\n(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.","path":["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"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-10.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:09Z","sha256":"889e7f0a1dc0825c161b32df3f36a0b293f8461cea44c0b2e5a25e839605d9d4","source_id":"us-cfr","stale":true,"prev":"us/10-cfr-431.85","next":"us/10-cfr-431.87"},"notice":"GroundRules: Original legal text. Not legal advice."}