WAC 51-11C-403326:

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PDFWAC 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 Typea	Subcategory or Rating Condition	Size Category (Input)	Minimum Efficiency	Test Procedurea
Boilers, hot water	Gas-fired	< 300,000 Btu/hg,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/he	84% Etd	DOE 10 C.F.R. 431.86
		> 2,500,000 Btu/h and ≤ 10,000,000 Btu/hb	85% Etd
		> 10,000,000 Btu/hb	82% Ecc
	Oil-firedf	< 300,000 Btu/hg,h	84% AFUE	DOE 10 C.F.R. 430 Appendix N
		≥ 300,000 Btu/h and ≤ 2,500,000 Btu/he	87% Etd	DOE 10 C.F.R. 431.86
		> 2,500,000 Btu/hb	88% Ecc
		> 10,000,000 Btu/hb	84% Ecd
Boilers, steam	Gas-fired	< 300,000 Btu/hg	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/hb	82% Etd	DOE 10 C.F.R. 431.86
		> 2,500,000 Btu/ha	79% Etd
		> 10,000,000 Btu/hb	79% Etd
	Gas-fired - natural draft	≥ 300,000 Btu/h and ≤ 2,500,000 Btu/hb	81% Etd
		> 2,500,000 Btu/hb	82% Etd
		> 10,000,000 Btu/hb	79% Etd
	Oil-firedf	< 300,000 Btu/h	82% AFUE	DOE 10 C.F.R. 430 Appendix N
		≥ 300,000 Btu/h and ≤ 2,500,000 Btu/hb	84% Etd	DOE 10 C.F.R. 431.86
		> 2,500,000 Btu/hb	85% Etd
		> 10,000,000 Btu/hb	81% Etd

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	Ec	=	Combustion efficiency (100 percent less flue losses).
	d	Et	=	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.

[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-403326, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.]