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PDFWAC 51-11C-404021

Table C404.2Minimum performance of water-heating equipment.

Table C404.2
Minimum Performance of Water-Heating Equipment
Equipment Type
Size Category (input)
Subcategory or Rating
Condition
Performance Requireda, b
Test Procedure
Storage water heaters, electric
≤ 12 kWd
Resistance
0.93 - 0.00 132V, EF
DOE 10 C.F.R. Part 430
≤ 24 amps and ≤ 250 volts
Heat pump
0.93 - 0.00 132V, EF
DOE 10 C.F.R. Part 430
˃ 12 kWd
Resistance
(0.3 + 27/Vm,%/h
Section G.2 of ANSI Z21.10.3
Instantaneous water heaters, electric
All
Resistance
0.93 - 0.00132V, EF
DOE 10 C.F.R. Part 430
Storage water heaters, gas
≤ 75,000 Btu/h
≥ 20 gal
0.67 - 0.0019V, EF
DOE 10 C.F.R. Part 430
˃ 75,000 Btu/h
< 4,000 Btu/h/gal
80% Et (Q/800 + 110√V) SL, Btu/h
Section G.1 and G.2 of ANSI Z21.10.3
 
˃ 50,000 Btu/h and
< 200,000 Btu/h
≥ 4,000 (Btu/h)/gal and < 2 gal
0.62 - 0.0019V, EF
DOE 10 C.F.R. Part 430
Instantaneous water heaters, gas
≥ 200,000 Btu/hc
≥ 4,000 Btu/h/gal and < 10 gal
80% Et
Section G.1 and G.2 of ANSI Z21.10.3
 
≥ 200,000 Btu/h
≥ 4,000 Btu/h/gal and ≥ 10 gal
80% Et (Q/800 + 110√V) SL, Btu/h
Storage water heaters, oil
≤ 105,000 Btu/h
≥ 20 gal
0.59 - 0.0019V, EF
DOE 10 C.F.R. Part 430
 
˃ 105,000 Btu/h
< 4,000 Btu/h/gal
78% Et (Q/800 + 110√V) SL, Btu/h
Section G.1 and G.2 of ANSI Z21.10.3
 
≤ 210,000 Btu/h
≥ 4,000 Btu/h/gal and < 2 gal
0.59 - 0.0019V, EF
DOE 10 C.F.R. Part 430
Instantaneous water heaters, oil
˃ 210,000 Btu/h
≥ 4,000 Btu/h/gal and < 10 gal
80% Et
Section G.1 and G.2 of ANSI Z21.10.3
 
˃ 210,000 Btu/h
≥ 4,000 Btu/h/gal and ≥ 10 gal
78% Et (Q/800 + 110√V) SL, Btu/h
Hot water supply boilers, gas and oil
≥ 300,000 Btu/h and
< 12,500,000 Btu/h
≥ 4,000 Btu/h/gal and < 10 gal
80% Et
Section G.1 and G.2 of ANSI Z21.10.3
Hot water supply boilers, gas
≥ 300,000 Btu/h and
< 12,500,000 Btu/h
≥ 4,000 Btu/h/gal and ≥ 10 gal
80% Et (Q/800 + 110√V) SL, Btu/h
Hot water supply boilers, oil
≥ 300,000 Btu/h and
< 12,500,000 Btu/h
≥ 4,000 Btu/h/gal and ˃ 10 gal
78% Et (Q/800 + 110√V) SL, Btu/h
Pool heaters, gas and oil
All
78% Et
ASHRAE 146
Heat pump pool heaters
All
4.0 COP
AHRI 146
Unfired storage tanks
All
Minimum insulation requirement R-12.5 (h • ft2 • °F)/Btu
(none)
For SI:
°C = [(°F) - 32]/1.8, 1 British thermal unit per hour =  0.2931 W, 1 gallon =  3.785 L, 1 British thermal unit per hour per gallon =  0.078 W/L.
a
Energy factor (EF) and thermal efficiency (Et) are minimum requirements. In the EF equation, V is the rated volume in gallons.
b
Standby loss (SL) is the maximum Btu/h based on a nominal 70°F temperature difference between stored water and ambient requirements. In the SL equation, Q is the nameplate input rate in Btu/h. In the SL equation for electric water heaters, V is the rated volume in gallons and Vm is the measured volume in gallons. In the SL equation for oil and gas water heaters and boilers, V is the rated volume in gallons.
c
Instantaneous water heaters with input rates below 200,000 Btu/h shall comply with these requirements if the water heater is designed to heat water to temperatures 180°F or higher.
d
Electric water heaters with an input rating of 12 kW (40,950 Btu/h) or less that are designed to heat water to temperatures of 180°F or greater shall comply with the requirements for electric water heaters that have an input rating greater than 12 kW (40,950 Btu/h).
[Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-13-089, § 51-11C-404021, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-404021, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-404021, filed 2/1/13, effective 7/1/13.]
Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.
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