PDFWAC 51-11C-40620

Section C406.2—Additional energy efficiency credit measures.

C406.2 Additional energy efficiency credit measures. Each energy efficiency credit measure used to meet credit requirements for the project shall include efficiency that is greater than the energy efficiency required for the building type and configuration requirements in Sections C402 through C405. Measures installed in the project that meet the requirements in Sections C406.2.1 through C406.2.14 shall achieve the credits listed for the measure and occupancy group in Table C406.2(1) or Table C406.2(2) or where calculations required by Sections C406.2.1 through C406.2.14 create or modify the table credits, the credits achieved shall be based upon the section calculations. Projects that chose to comply with the fossil fuel pathway in Section C401.3 shall use Table C406.2(2) to achieve credits.
For mixed fuel space heating systems, the number of space heating energy efficiency credits available for measures with a prorating flag "Heat" are calculated using the following equation:
CSH = CHPSH x B/C + CFFSH x (1 – B/C)
Where:
 
CSH
=
Blended credits for mixed fuel systems.
 
CHPSH
=
Credits available in Table C406.2(1).
 
CFFSH
=
Credits available in Table C406.2(2).
 
B
=
Installed space heating capacity in kBTU/h of space heating appliances that comply with any of the exceptions to Section C403.1.4.
 
C
=
Total installed space heating capacity in kBTU/h of all space heating appliances.
For mixed fuel service water heating systems, the number of service water heating energy efficiency credits available for measures with a prorating flag "SWH" are calculated using the following equation:
CWH = CHPWH × B/C + CFFWH × (1 – B/C)
Where:
 
CWH
=
Blended credits for mixed fuel systems.
 
CHPWH
=
Credits available in Table C406.2(1).
 
CFFWH
=
Credits available in Table C406.2(2).
 
B
=
Installed service water heating capacity in kBTU/h of service water heating appliances that comply with any of the exceptions to Section C404.2.1.
 
C
=
Total installed service water heating capacity in kBTU/h of all service water heating appliances.
Table C406.2(1)
Efficiency Measure Credits
Measure Title
Applicable Section
Prorating Flag
Occupancy Group
Group R-1
Group R-2
Group B
Group E
Group M
All Other
1. Dwelling unit HVAC control
C406.2.1
Heat
NA
7
NA
NA
NA
NA
2. Improved HVAC TSPRa
C406.2.2.1
Heat
NA
8
11
17
22
NA
3. Improve cooling and fan efficiency
C406.2.2.2
Heat
2
2
3
4
3
2
4. Improve heating efficiency
C406.2.2.3
Heat
2
3
3
10
16
7
5. Improved low-carbon district energy system (10% better)
C406.2.2.4
 
3
3
4
11
17
8
6. Improved low-carbon district energy system (20% better)b
C406.2.2.5
 
9
10
12
33
52
24
7. High performance DOAS
C406.2.2.6
Heat
31
31
21
39
40
21/
(A) 40c
8. Fault detection & diagnostics (FDD)
C406.2.2.7
Heat
2
2
2
6
9
4
9. 10% reduced lighting power
C406.2.3.1
Heat
7
4
18
16
20
15
10. 20% reduced lighting powerd
C406.2.3.2
Heat
13
8
36
32
40
29
11. Lamp efficacy improvement
C406.2.3.3
Heat
5
6
NA
NA
NA
NA
12. Residential lighting control
C406.2.4.1
Heat
NA
8
NA
NA
NA
NA
13. Enhanced lighting control
C406.2.4.2
Heat
1
1
6
6
11
6
14. Renewable energy
C406.2.5
 
7
12
13
13
10
11
15. Shower drain heat recovery
C406.2.6.1
SWH
9
30
NA
3
NA
NA
16. Service water heat recovery
C406.2.6.2
SWH
35
111
13
14
(Grocery)
41e
NA
17. Heat pump water heating
C406.2.6.3
SWH
72
54
1
13
5
29f
18. High efficiency service water heating, gas-fired
C406.2.6.4
SWH
NA
NA
NA
NA
NA
NA
19. Heat trace system
C406.2.7.1
SWH
6
13
4
1
NA
6
20. Point of use water heater
C406.2.7.2
SWH
NA
NA
19
5
NA
NA
21. Service hot water distribution right sizing
C406.2.8
 
13
42
NA
NA
NA
NA
22. High performance service hot water temperature maintenance system
C406.2.9
 
6
13
4
1
NA
6
23. High efficiency service hot water circulation system
C406.2.10
 
3
6
2
1
NA
4
24. Low flow residential showerheads
C406.2.11
SWH
3
3
NA
NA
NA
NA
25. Enhanced envelope performanceg
C406.2.12
Heat
24
20
13
5
19
14
26. Base reduced air leakageg
C406.2.13.1
 
29
24
6
3
9
11
27. Enhanced reduced air leakageg
C406.2.13.2
Heat
53
44
11
5
16
20
28. Enhanced commercial kitchen equipment
C406.2.14
Heat
30h
18h
18h
30h
30h
31h
29. Enhanced residential kitchen equipment
C406.2.15
Heat
12
19
NA
NA
NA
NA
30. Enhanced residential laundry equipment
C406.2.16
Heat
NA
6
NA
NA
NA
NA
31. Heat pump clothes dryers
C406.2.17
Heat
6
6
NA
NA
NA
NA
32. Efficient elevator equipment
C406.2.18
Heat
3
5
5
5
4
4
a
Projects using Item 2 shall not use Items 3, 4, or 7.
b
Projects using C406.2.2.5 shall not use C406.2.2.4.
c
For C406.2.2.6, occupancy Group A achieves 40 credits while other occupancy groups within the "all other" category achieve 21 credits.
d
Projects using C406.2.3.2 shall not use C406.2.3.1.
e
Service water heat recovery and heat pump water heating are available in Group M only for grocery stores larger than 10,000 ft2. Large mixed retail with full grocery and butcher sections shall achieve half the credits. This credit is not available where refrigeration recovery to heat service hot water is used to meet the requirements of Section C403.9.2.3.
f
Heat pump water heating efficiency credits are available in the "all other" category only for Group A-2.
g
Buildings or building areas that are exempt from the thermal envelope requirements in accordance with Sections C402.1.1 and C402.1.2, do not qualify for this package.
h
Additional energy efficiency credits, up to the maximum shown in Table C406.2(1), shall be calculated according to Section C406.2.14.
Table C406.2(2)
Efficiency Measure Credits for use with
Fossil Fuel Compliance Path
Measure Title
Applicable Section
Prorating Flag
Occupancy Group
Group R-1
Group R-2
Group B
Group E
Group M
All Other
1. Dwelling unit HVAC control
C406.2.1
Heat
NA
8
NA
NA
NA
NA
2. Improved HVAC TSPRa
C406.2.2.1
Heat
NA
9
12
19
24
NA
3. Improve cooling and fan efficiency
C406.2.2.2
Heat
12
8
14
8
10
10
4. Improve heating efficiency
C406.2.2.3
Heat
2
3
3
11
18
8
5. Improved low-carbon district energy system (10% better)
C406.2.2.4
 
3
3
4
12
19
9
6. Improved low-carbon district energy system (20% better)b
C406.2.2.5
 
10
11
13
36
57
26
7. High performance DOAS
C406.2.2.6
Heat
34
34
23
43
44
23/
(A) 40c
8. Fault detection & diagnostics (FDD)
C406.2.2.7
Heat
2
2
2
6
9
4
9. 10% reduced lighting power
C406.2.3.1
Heat
7
4
18
16
20
15
10. 20% reduced lighting powerd
C406.2.3.2
Heat
13
8
36
32
40
29
11. Lamp efficacy improvement
C406.2.3.3
Heat
5
6
NA
NA
NA
NA
12. Residential lighting control
C406.2.4.1
Heat
NA
8
NA
NA
NA
NA
13. Enhanced lighting control
C406.2.4.2
Heat
1
1
6
6
11
6
14. Renewable energy
C406.2.5
 
7
12
13
13
10
11
15. Shower drain heat recovery
C406.2.6.1
SWH
10
33
NA
3
NA
NA
16. Service water heat recovery
C406.2.6.2
SWH
35
111
13
14
(Grocery)
41e
NA
17. Heat pump water heating
C406.2.6.3
SWH
135
163
17
33
(Grocery)
95e
(A-2)
95f
18. High efficiency service water heating, gas-fired
C406.2.6.4
SWH
59
65
6
11
18
32
19. Heat trace system
C406.2.7.1
SWH
6
13
4
1
NA
6
20. Point of use water heater
C406.2.7.2
SWH
NA
NA
19
5
NA
NA
21. Service hot water distribution right sizing
C406.2.8
 
13
42
NA
NA
NA
NA
22. High performance service hot water temperature maintenance system
C406.2.9
 
6
13
4
1
NA
6
23. High efficiency service hot water circulation system
C406.2.10
 
3
6
2
1
NA
4
24. Low flow residential showerheads
C406.2.11
SWH
3
3
NA
NA
NA
NA
25. Enhanced envelope performanceg
C406.2.12
Heat
24
20
13
5
19
14
26. Base reduced air leakageg
C406.2.13.1
 
29
24
6
3
9
11
27. Enhanced reduced air leakageg
C406.2.13.2
Heat
53
44
11
5
16
20
28. Enhanced commercial kitchen equipment
C406.2.14
Heat
30h
18h
18h
30h
30h
31h
29. Enhanced residential kitchen equipment
C406.2.15
Heat
12
19
NA
NA
NA
NA
30. Enhanced residential laundry equipment
C406.2.16
Heat
NA
6
NA
NA
NA
NA
31. Heat pump clothes dryers
C406.2.17
Heat
6
6
NA
NA
NA
NA
32. Efficient elevator equipment
C406.2.18
Heat
3
5
5
5
4
4
a
Projects using Item 2 shall not use Items 3, 4, or 7.
b
Projects using C406.2.2.5 shall not use C406.2.2.4.
c
For C406.2.2.6, occupancy Group A achieves 40 credits while other occupancy groups within the "all other" category achieve 21 credits.
d
Projects using C406.2.3.2 shall not use C406.2.3.1.
e
Service water heat recovery and heat pump water heating are available in Group M only for grocery stores larger than 10,000 ft2. Large mixed retail with full grocery and butcher sections shall achieve half the credits. This credit is not available where refrigeration recovery to heat service hot water is used to meet the requirements of Section C403.9.2.3.
f
Heat pump water heating efficiency credits are available in the "all other" category only for Group A-2.
g
Buildings or building areas that are exempt from the thermal envelope requirements in accordance with Sections C402.1.1 and C402.1.2, do not qualify for this package.
h
Additional energy efficiency credits, up to the maximum shown in Table C406.2(2), shall be calculated according to Section C406.2.14.
[Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-40620, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160, chapters 19.27A and 19.27 RCW. WSR 24-03-085, § 51-11C-40620, filed 1/16/24, effective 3/15/24; WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40620, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.]