Statutes, codes, and regulations
Washington Administrative Code
Title 51 - Enterprise Services, Department of (Building Code Council)
Chapter 51-11C - State Building Code adoption and amendment of the 2021 edition of the International Energy Conservation Code, Commercial
Section 51-11C-404021 - Table C404.2-Minimum performance of water-heating equipment

Wash. Admin. Code § 51-11C-404021

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Current through Register Vol. 24-21, November 1, 2024
Section 51-11C-404021 - Table C404.2-Minimum performance of water-heating equipment

Table C404.2 Minimum Performance of Water-Heating Equipment

Equipment Type

Size Category (input)

Subcategory or Rating Condition

Draw Pattern

Performance Requireda,j

Test Procedureb

Electric tabletop water heatersk

[LESS THAN EQUAL TO] 12 kWc

[GREATER THAN EQUAL TO] 20 gal

[LESS THAN EQUAL TO] 120 gal

Very small Low Medium High

UEF [GREATER THAN EQUAL TO] 0.6323 - (0.0058 × Vr)

UEF [GREATER THAN EQUAL TO] 0.9188 - (0.0031 × Vr)

UEF [GREATER THAN EQUAL TO] 0.9577 - (0.0023 × Vr)

UEF [GREATER THAN EQUAL TO] 0.9884 - (0.0016 × Vr)

DOE 10 C.F.R. Part 430 App. E

Electric storage water heatersg,i resistance and heat pump

[LESS THAN EQUAL TO] 12 kWc

[GREATER THAN EQUAL TO] 20 gal

[LESS THAN ] 55 gal

Very small Low Medium High

UEF [GREATER THAN EQUAL TO] 0.8808 - (0.0008 × Vr)

UEF [GREATER THAN EQUAL TO] 0.9254 - (0.0003 × Vr)

UEF [GREATER THAN EQUAL TO] 0.9307 - (0.0002 × Vr)

UEF [GREATER THAN EQUAL TO] 0.9349 - (0.0001 × Vr)

DOE 10 C.F.R. Part 430 App. E

[LESS THAN EQUAL TO] 12 kW

[GREATER THAN ] 55 gal

[LESS THAN EQUAL TO] 120 gal

Very small Low Medium High

UEF [GREATER THAN EQUAL TO] 1.9236 - (0.0011 × Vr)

UEF [GREATER THAN EQUAL TO] 2.0440 - (0.0011 × Vr)

UEF [GREATER THAN EQUAL TO] 2.1171 - (0.0011 × Vr)

UEF [GREATER THAN EQUAL TO] 2.2418 - (0.0011 × Vr)

DOE 10 C.F.R. Part 430 App. E

Electric storage water heatersg

[GREATER THAN EQUAL TO] 12 kW

(0.3 + 27/Vm), %h

DOE 10 C.F.R. 431.106 App B.

Grid-enabled water heatersg,l

[LESS THAN ] 75 gal

Very small Low Medium High

UEF [GREATER THAN EQUAL TO] 1.0136 - (0.0028 × Vr)

UEF [GREATER THAN EQUAL TO] 0.9984 - (0.0014 × Vr)

UEF [GREATER THAN EQUAL TO] 0.9853 - (0.0010 × Vr)

UEF [GREATER THAN EQUAL TO] 0.9720 - (0.0007 × Vr)

10 C.F.R. 430 Appendix E

Electric instantaneous water heaterh

[LESS THAN ] 12 kW

[LESS THAN ] 2 gal

Very small Low Medium High

UEF [GREATER THAN EQUAL TO] 0.91

UEF [GREATER THAN EQUAL TO] 0.91

UEF [GREATER THAN EQUAL TO] 0.91

UEF [GREATER THAN EQUAL TO] 0.92

DOE 10 C.F.R. Part 430

[GREATER THAN ] 12 kW

[LESS THAN EQUAL TO] 58.6 kWc

[LESS THAN EQUAL TO] 2 gal [LESS THAN EQUAL TO] 180°F

All

UEF [GREATER THAN EQUAL TO] 0.80

DOE 10 C.F.R. Part 430

Gas storage water heatersg

[LESS THAN EQUAL TO] 75,000 Btu/h

[GREATER THAN EQUAL TO] 20 gal & [LESS THAN EQUAL TO] 55 galf

Very small Low Medium High

UEF [GREATER THAN EQUAL TO] 0.3456 - (0.0020 × Vr)

UEF [GREATER THAN EQUAL TO] 0.5982 - (0.0019 × Vr)

UEF [GREATER THAN EQUAL TO] 0.6483 - (0.0017 × Vr)

UEF [GREATER THAN EQUAL TO] 0.6920 - (0.0013 × Vr)

DOE 10 C.F.R. Part 430 App. E

[LESS THAN EQUAL TO] 75,000 Btu/h

[GREATER THAN ] 55 gal & [LESS THAN EQUAL TO] 100 galf

Very small Low Medium High

UEF [GREATER THAN EQUAL TO] 0.6470 - (0.0006 × Vr)

UEF [GREATER THAN EQUAL TO] 0.7689 - (0.0005 × Vr)

UEF [GREATER THAN EQUAL TO] 0.7897 - (0.0004 × Vr)

UEF [GREATER THAN EQUAL TO] 0.8072 - (0.0003 × Vr)

DOE 10 C.F.R. Part 430 App. E

[GREATER THAN EQUAL TO] 75,000 Btu/h and [LESS THAN EQUAL TO] 105,000 Btu/hd

[LESS THAN ] 120 gal [LESS THAN] 180°F

Very small Low Medium High

UEF [GREATER THAN EQUAL TO] 0.2674-0.0009 x Vr

UEF [GREATER THAN EQUAL TO] 0.5362-0.0012 x Vr

UEF [GREATER THAN EQUAL TO] 0.6002-0.0011 x Vr

UEF [GREATER THAN EQUAL TO] 0.6597-0.0009 x Vr

DOE 10 C.F.R. Part 430 App. E

[LESS THAN EQUAL TO] 105,000 Btu/hd,f

80% Et

SL [LESS THAN EQUAL TO] (Q/800 +110[SQUAREROOT]V), Btu/h

DOE 10 C.F.R. 431.106

Gas instantaneous water heaterh

[GREATER THAN EQUAL TO] 50,000 Btu/h and [LESS THAN ] 200,000 Btu/

[LESS THAN ] 2 gal

Very small Low Medium High

UEF [GREATER THAN EQUAL TO] 0.80

UEF [GREATER THAN EQUAL TO] 0.81

UEF [GREATER THAN EQUAL TO] 0.81

UEF [GREATER THAN EQUAL TO] 0.81

DOE 10 C.F.R. Part 430 App. E

[GREATER THAN EQUAL TO] 200,000 Btu/hd,f

[LESS THAN ] 10 gal

80% Et

DOE 10 C.F.R. 431.106

[GREATER THAN EQUAL TO] 200,000 Btu/hf

[GREATER THAN EQUAL TO] 10 gal

80% Et

SL [LESS THAN EQUAL TO] (Q/800 +110[SQUAREROOT]V), Btu/h

Oil storage water heatersg

[LESS THAN EQUAL TO ] 105,000 Btu/h

[LESS THAN EQUAL TO] 50 gal

Very small Low Medium High

UEF = 0.2509 - (0.0012 × Vr)

UEF = 0.5330 - (0.0016 × Vr)

DOE 10 C.F.R. Part 430

UEF = 0.6078 - (0.0016 × Vr)

UEF = 0.6815 - (0.0014 × Vr)

[GREATER THAN EQUAL TO] 105,000 Btu/[LESS THAN EQUAL TO] 140,000 Btu/he

[LESS THAN EQUAL TO] 120 gal [LESS THAN EQUAL TO] 180°F

Very small Low Medium High

UEF [GREATER THAN EQUAL TO] 0.2932-0.0015 x Vr

UEF [GREATER THAN EQUAL TO] 0.5596-0.0018 x Vr

UEF [GREATER THAN EQUAL TO] 0.6194-0.0016 x Vr

UEF [GREATER THAN EQUAL TO] 0.6740-0.0013 x Vr

DOE 10 C.F.R. Part 430 App. E

[GREATER THAN ] 140,000 Btu/h

80% Et

SL [LESS THAN EQUAL TO] (Q/800 +110[SQUAREROOT]V), Btu/h

DOE 10 C.F.R. 431.106

Oil instantaneous water heaterh

[LESS THAN EQUAL TO] 210,000 Btu/h

[LESS THAN ] 2 gal

80% Et

EF [GREATER THAN EQUAL TO] 0.59 - 0.0005 x V

DOE 10 C.F.R. Part 430 App. E

[GREATER THAN ] 210,000 Btu/h

[LESS THAN ] 10 gal

80% Et

DOE 10 C.F.R. 431.106

[GREATER THAN ] 210,000 Btu/h

[GREATER THAN EQUAL TO] 10 gal

78% Et

SL [LESS THAN EQUAL TO] (Q/800 +110[SQUAREROOT]V), Btu/h

DOE 10 C.F.R. 431.106

Hot water supply boilers, gas and oilh

[GREATER THAN EQUAL TO] 300,000 Btu/h and [LESS THAN] 12,500,000 Btu/h

[LESS THAN ] 10 gal

80% Et

DOE 10 C.F.R. 431.106

Hot water supply boilers, gash

[GREATER THAN EQUAL TO] 300,000 Btu/h and [LESS THAN ] 12,500,000 Btu/h

[GREATER THAN EQUAL TO] 10 gal

80% Et

SL [LESS THAN EQUAL TO] (Q/800 +110[SQUAREROOT]V), Btu/h

DOE 10 C.F.R. 431.106

Hot water supply boilers, oilh

[GREATER THAN EQUAL TO] 300,000 Btu/h and [LESS THAN ] 12,500,000 Btu/h

[GREATER THAN EQUAL TO] 10 gal

78% Et

SL [LESS THAN EQUAL TO] (Q/800 +110[SQUAREROOT]V), Btu/h

DOE 10 C.F.R. 431.106

Pool heaters, gas

All

82% Et

DOE 10 C.F.R. Part 430 App. P

Heat pump pool heaters

All

50°F db

44.2°F wb outdoor air

80.0°F entering water

4.0 COP

DOE 10 C.F.R. Part 430 App. P

Unfired storage tanks

All

Minimum insulation requirement R-12.5 (h-ft2-°F)/Btu

(none)

a Thermal efficiency ( Et) is a minimum requirement, while standby loss is a maximum requirement. In the standby loss equation, V is the rated volume in gallons and Q is the nameplate input rate in Btu/h. V m is the measured volume in the tank in gallons. Standby loss for electric water heaters is in terms of %/h and denoted by the term "S," and standby loss for gas and oil water heaters is in terms of Btu/h and denoted by the term "SL" Draw pattern (DP) refers to the water draw profile in the Uniform Energy Factor (UEF) test. UEF and Energy Factor (EF) are minimum requirements. In the UEF standard equations, V r refers to the rated volume in gallons.

b Chapter 6 contains a complete specification, including the year version, of the referenced test procedure.

c Electric instantaneous water heaters with input capacity > 12 kW and [LESS THAN EQUAL TO] 58.6 kW that have either (1) a storage volume > 2 gal; or (2) is designed to provide outlet hot water at temperatures greater than 180°F; or (3) uses three-phase power has no efficiency standard.

d Gas storage water heaters with input capacity > 75,000 Btu/h and [LESS THAN EQUAL TO] 105,000 Btu/h must comply with the requirements for the > 105,000 Btu/h if the water heater either (1) has a storage volume > 120 gal; (2) is designed to provide outlet hot water at temperatures greater than 180°F; or (3) uses three-phase power.

e Oil storage water heaters with input capacity > 105,000 Btu/h and [LESS THAN EQUAL TO] 140,000 Btu/h must comply with the requirements for the > 140,000 Btu/h if the water heater either (1) has a storage volume > 120 gal; (2) is designed to provide outlet hot water at temperatures greater than 180°F; or (3) uses three-phase power.

f Water heaters or gas pool heaters in this category are regulated as consumer products by the USDOE as defined in 10 C.F.R. Part 430.

g Storage water heaters have a ratio of input capacity (Btu/h) to tank volume (gal) [LESS THAN EQUAL TO] 4000.

h Instantaneous water heaters and hot water supply boilers have an input capacity (Btu/h) divided by storage volume (gal) [GREATER THAN EQUAL TO] 4000 Btu/h-gal.

i There are no minimum efficiency requirements for electric heat pump water heaters greater than 12 kW or for gas heat pump water heaters.

j Refer to Section C404.2.1 for additional requirements for service water heat system equipment.

k A tabletop water heater is a storage water heater that is enclosed in a rectangular cabinet with a flat top surface not more than three feet (0.91 m) in height and have a ratio of input capacity (Btu/h) to tank volume (gal) [LESS THAN EQUAL TO] 4000.

l A grid-enabled water heater is an electric resistance water heater that meets all of the following:

1. Has a rated storage tank volume of more than 75 gallons.
2. Is manufactured on or after April 16, 2015.
3. Is equipped at the point of manufacture with an activation lock.
4. Bears a permanent label applied by the manufacturer that complies with all of the following:
4.1 Is made of material not adversely affected by water.
4.2 Is attached by means of nonwater soluble adhesive.
4.3 Advises purchasers and end-users of the intended and appropriate use of the product with the following notice printed in 16.5 point Arial Narrow Bold font: "IMPORTANT INFORMATION: This water heater is intended only for use as a part of an electric thermal storage or demand response program. It will not provide adequate hot water unless enrolled in such a program and activated by your utility company or another program operator. Confirm the availability of a program in your local area before purchasing or installing this product."

Wash. Admin. Code § 51-11C-404021

Amended by WSR 16-03-072, Filed 1/19/2016, effective 7/1/2016
Amended by WSR 16-13-089, Filed 6/15/2016, effective 7/16/2016
Amended by WSR 19-24-040, Filed 11/26/2019, effective 7/1/2020
Amended by WSR 20-21-080, Filed 10/19/2020, effective 2/1/2021
Amended by WSR 22-14-091, Filed 7/1/2022, effective 7/1/2023

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency and appear in the Register pursuant to the requirements of RCW 34.08.040.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency and appear in the Register pursuant to the requirements of RCW 34.08.040.