WAC 51-11C-403326. Table C403.3.2(6) — Minimum efficiency requirements — Gas-fired and oil-fired boilers

Table C403.3.2(6) Gas- and Oil-Fired Boilers — Minimum Efficiency Requirements Equipment Type a Subcategory or Rating Condition Size Category (Input) Minimum Efficiency Test Procedure a Boilers, hot water Gas-fired < 300,000 Btu/h g,h for applications outside the U.S. 82% AFUE DOE 10 C.F.R. 430 Appendix N ≥ 300,000 Btu/h and ≤ 2,500,000 Btu/h e 84% E t d DOE 10 C.F.R. 431.86 > 2,500,000 Btu/h and ≤ 10,000,000 Btu/h b 85% E t d > 10,000,000 Btu/h b 82% E c c Oil-fired f < 300,000 Btu/h g,h 84% AFUE DOE 10 C.F.R. 430 Appendix N ≥ 300,000 Btu/h and ≤ 2,500,000 Btu/h e 87% E t d DOE 10 C.F.R. 431.86 > 2,500,000 Btu/h b 88% E c c > 10,000,000 Btu/h b 84% E c d Boilers, steam Gas-fired < 300,000 Btu/h g 81% AFUE DOE 10 C.F.R. 430 Appendix N Gas-fired - all, except natural draft ≥ 300,000 Btu/h and ≤ 2,500,000 Btu/h b 82% E t d DOE 10 C.F.R. 431.86 > 2,500,000 Btu/h a 79% E t d > 10,000,000 Btu/h b 79% E t d Gas-fired - natural draft ≥ 300,000 Btu/h and ≤ 2,500,000 Btu/h b 81% E t d > 2,500,000 Btu/h b 82% E t d > 10,000,000 Btu/h b 79% E t d Oil-fired f < 300,000 Btu/h 82% AFUE DOE 10 C.F.R. 430 Appendix N ≥ 300,000 Btu/h and ≤ 2,500,000 Btu/h b 84% E t d DOE 10 C.F.R. 431.86 > 2,500,000 Btu/h b 85% E t d > 10,000,000 Btu/h b 81% E t d Equipment Type a Subcategory or Rating Condition Size Category (Input) Minimum Efficiency Test Procedure a Boilers, hot water Gas-fired < 300,000 Btu/h g,h for applications outside the U.S. 82% AFUE DOE 10 C.F.R. 430 Appendix N ≥ 300,000 Btu/h and ≤ 2,500,000 Btu/h e 84% E t d DOE 10 C.F.R. 431.86 > 2,500,000 Btu/h and ≤ 10,000,000 Btu/h b 85% E t d > 10,000,000 Btu/h b 82% E c c Oil-fired f < 300,000 Btu/h g,h 84% AFUE DOE 10 C.F.R. 430 Appendix N ≥ 300,000 Btu/h and ≤ 2,500,000 Btu/h e 87% E t d DOE 10 C.F.R. 431.86 > 2,500,000 Btu/h b 88% E c c > 10,000,000 Btu/h b 84% E c d Boilers, steam Gas-fired < 300,000 Btu/h g 81% AFUE DOE 10 C.F.R. 430 Appendix N Gas-fired - all, except natural draft ≥ 300,000 Btu/h and ≤ 2,500,000 Btu/h b 82% E t d DOE 10 C.F.R. 431.86 > 2,500,000 Btu/h a 79% E t d > 10,000,000 Btu/h b 79% E t d Gas-fired - natural draft ≥ 300,000 Btu/h and ≤ 2,500,000 Btu/h b 81% E t d > 2,500,000 Btu/h b 82% E t d > 10,000,000 Btu/h b 79% E t d Oil-fired f < 300,000 Btu/h 82% AFUE DOE 10 C.F.R. 430 Appendix N ≥ 300,000 Btu/h and ≤ 2,500,000 Btu/h b 84% E t d DOE 10 C.F.R. 431.86 > 2,500,000 Btu/h b 85% E t d > 10,000,000 Btu/h b 81% E t d For SI: 1 British thermal unit per hour = 0.2931 W. a Chapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure. b These requirements apply to boilers with rated input of 8,000,000 Btu/h or less that are not packaged boilers and to all packaged boilers. Minimum efficiency requirements for boilers cover all capacities of packaged boilers. c E c = Combustion efficiency (100 percent less flue losses). d E t = Thermal efficiency. e Maximum capacity – Minimum and maximum ratings as provided for and allowed by the unit's controls. f Includes oil-fired (residual). g Boilers shall not be equipped with a constant burning pilot light. h A boiler not equipped with a tankless domestic water heating coil shall be equipped with an automatic means for adjusting the temperature of the water such that an incremental change in inferred heat load produces a corresponding incremental change in the temperature of the water supplied. i This table is a replica of ASHRAE 90.1 Table 6.8.1-6 Gas- and Oil-Fired Boilers—Minimum Efficiency Requirements.