Washington Administrative Code › Title 51 - Enterprise Services, Department of (Building Code Council) › Chapter 51-11R - State Building Code adoption and amendment of the 2021 edition of the International Energy Conservation Code, Residential › Section 51-11R-40621 - Table R406.3-Energy credits

Current through Register Vol. 24-14, July 15, 2024
TABLE 406.3
ENERGY CREDITS
OPTION
DESCRIPTION
CREDIT(S)
All Other
Group
							 R-2b
1. efficient building envelope
							 options
Only one option from Items 1.1 through 1.4 may be
							 selected in this category.
Compliance with the conductive UA targets is
							 demonstrated using Section R402.1.5, Total UA alternative, where [GREATER THAN]
							 the required %UA reduction
1.1
Prescriptive compliance is based on Table R402.1.3
							 with the following modifications:
Vertical fenestration U = 0.22.
0.5
0.5
1.2
Prescriptive compliance is based on Table R402.1.3
							 with the following modifications:
Vertical fenestration U = 0.25
Floor R-38
Basement wall R-21 int plus R-5 ci
Ceiling and single-rafter or joist-vaulted R-60
							 advanced
Slab on grade R-10 perimeter and under entire
							 slab
Below grade slab R-10 perimeter and under entire
							 slab
or
Compliance based on Section R402.1.5: Reduce the
							 Total conductive UA by 15%.
1.0
1.0
1.3
Prescriptive compliance is based on Table R402.1.3
							 with the following modifications:
Vertical fenestration U = 0.18
Ceiling and single-rafter or joist-vaulted R-60
							 advanced
Floor R-38
Basement wall R-21 int plus R-12 ci
Slab on grade R-10 perimeter and under entire
							 slab
Below grade slab R-10 perimeter and under entire
							 slab
or
Compliance based on Section R402.1.5: Reduce the
							 Total conductive UA by 22.5%.
1.5
1.5
1.4
Prescriptive compliance is based on Table R402.1.3
							 with the following modifications:
Vertical fenestration U = 0.18
Ceiling and single-rafter or joist-vaulted R-60
							 advanced
Wood frame wall R-21 int plus R-16 ci
Floor R-48
Basement wall R-21 int plus R-16 ci
Slab on grade R-20 perimeter and under entire
							 slab
Below grade slab R-20 perimeter and under entire
							 slab
or
Compliance based on Section R402.1.5: Reduce the
							 Total conductive UA by 30%.
2.5
2.0
2. air leakage control and efficient
							 ventilation options
Only one option from Items 2.1 through 2.3 may be
							 selected in this category.
2.1
Compliance based on Section R402.4.1.2:
Reduce the tested air leakage to 2.0 air changes per
							 hour maximum at 50 Pascals
or
For R-2 Occupancies, optional compliance based on
							 Section R402.4.1.2: Reduce the tested air leakage to 0.25
							 cfm/ft2 maximum at 50 Pascals
and
All whole house ventilation requirements as
							 determined by Section M1505.3 of the
International Residential
							 Code
or Section 403.8 of the
International Mechanical
							 Code
shall be met with a heat recovery ventilation system with minimum
							 sensible heat recovery efficiency of 0.65.
To qualify to claim this credit, the building permit
							 drawings shall specify the option being selected and shall specify the maximum
							 tested building air leakage and shall show the heat recovery ventilation
							 system.
1.0
1.0
2.2
Compliance based on Section R402.4.1.2:
Reduce the tested air leakage to 1.5 air changes per
							 hour maximum at 50 Pascals
or
For R-2 Occupancies, optional compliance based on
							 Section R402.4.1.2: Reduce the tested air leakage to 0.20
							 cfm/ft2 maximum at 50 Pascals
and
All whole house ventilation requirements as
							 determined by Section M1505.3 of the
International Residential
							 Code
or Section 403.8 of the
International Mechanical
							 Code
shall be met with a heat recovery ventilation system with minimum
							 sensible heat recovery efficiency of 0.75.
To qualify to claim this credit, the building permit
							 drawings shall specify the option being selected and shall specify the maximum
							 tested building air leakage and shall show the heat recovery ventilation
							 system.
1.5
1.5
2.3
Compliance based on Section R402.4.1.2:
Reduce the tested air leakage to 0.6 air changes per
							 hour maximum at 50 Pascals
or
For R-2 Occupancies, optional compliance based on
							 Section R402.4.1.2: Reduce the tested air leakage to 0.15
							 cfm/ft2 maximum at 50 Pascals
and
All whole house ventilation requirements as
							 determined by Section M1505.3 of the
International Residential
							 Code
or Section 403.8 of the
International Mechanical
							 Code
shall be met with a heat recovery ventilation system with minimum
							 sensible heat recovery efficiency of 0.80. Duct installation shall comply with
							 Section R403.3.2.
To qualify to claim this credit, the building permit
							 drawings shall specify the option being selected and shall specify the maximum
							 tested building air leakage and shall show the heat recovery ventilation
							 system.
2.0
2.0
3.
HIGH EFFICIENCY HVAC EQUIPMENT
							 OPTIONS
Only one option from Items 3.1 through 3.10 may be
							 selected in this category. Item 3.11 may be taken with Items 3.1 or
							 3.3c only.
3.1a
For a System Type 1 in Table R406.2:
Energy Star rated (U.S. North) gas or propane furnace
							 with minimum AFUE of 95%.
or
Energy Star rated (U.S. North) gas or propane boiler
							 with minimum AFUE of 90%
To qualify to claim this credit, the building permit
							 drawings shall specify the option being selected and shall specify the heating
							 equipment type and the minimum equipment efficiency.
1.0
1.0
3.2a
For secondary heating system serving System Type 2 in
							 Table R406.2:
Energy Star rated (U.S. North) Gas or propane
							 furnace with minimum AFUE of 95%
or
Energy Star rated (U.S. North) Gas or propane boiler
							 with minimum AFUE of 90%.
To qualify to claim this credit, the building permit
							 drawings shall specify the option being selected and shall specify the heating
							 equipment type and the minimum equipment efficiency.
0.5
0.5
3.3a,c,d
Air-source centrally ducted heat pump with minimum
							 HSPF2 of 8.1 (HSPF of 9.5).
In areas where the winter design temperature as
							 specified in Appendix RC is 23°F or below, a cold climate heat pump found
							 on the NEEP cc ASHP qualified product list shall be used.
To qualify to claim this credit, the building permit
							 drawings shall specify the option being selected and shall specify the heating
							 equipment type and the minimum equipment efficiency.
0.5
N/A
3.4a,d
Closed-loop ground source heat pump; with a minimum
							 COP of 3.3
or
Open loop water source heat pump with a maximum
							 pumping hydraulic head of 150 feet and minimum COP of 3.6.
To qualify to claim this credit, the building permit
							 drawings shall specify the option being selected and shall specify the heating
							 equipment type and the minimum equipment efficiency.
1.5
1.0
3.5d
Ductless mini-split heat pump system, zonal control:
							 In homes where the primary space heating system is zonal electric heating, a
							 ductless minisplit heat pump system with a minimum HSPF2 of 9 (HSPF of 10.0)
							 shall be installed and provide heating to the largest zone of the housing
							 unit.
To qualify to claim this credit, the building permit
							 drawings shall specify the option being selected and shall specify the heating
							 equipment type and the minimum equipment efficiency.
1.5
2.0
3.6a,d
Air-source, centrally ducted heat pump with minimum
							 HSPF2 of 9.4 (HSPF of 11.0).
A centrally ducted air source cold climate variable
							 capacity heat pump (cc V CHP) found on the NEEP cc VCHP qualified product list
							 with a minimum of 9 HSPF2 (10 HSPF) may be used to satisfy this
							 requirement.
In areas where the winter design temperature as
							 specified in Appendix RC is 23°F or below, an air source centrally ducted
							 heat pump shall be a cold climate variable capacity heat pump as listed on the
							 NEEP qualified product list.
To qualify to claim this credit, the building permit
							 drawings shall specify the option being selected and shall specify the heating
							 equipment type and the minimum equipment efficiency.
1.0
N/A
3.7a,d,e
Ductless split system heat pumps with no electric
							 resistance heating in the primary living areas. A ductless heat pump system
							 with a minimum HSPF2 of 9 (HSPF of 10) shall be sized and installed to provide
							 heat to entire dwelling unit at the design outdoor air temperature.
Exception:
In homes with total heating
							 loads of 24,000 or less using multi-zone mini-split systems with nominal
							 ratings of 24,000 or less, the minimum HSPF 2 to claim this credit shall be 8.1
							 (9 HSPF).
To qualify to claim this credit, the building permit
							 drawings shall specify the option being selected, the heated floor area
							 calculation, the heating equipment type(s), the minimum equipment efficiency,
							 and total installed heat capacity (by equipment type).
2.0
3.0
3.8a,d
Air-to-water heat pump with minimum COP of 3.2 at
							 47°F, rated in accordance with AHRI 550/590 by an accredited or certified
							 testing lab.
To qualify to claim this credit, the building permit
							 drawings shall specify the option being selected, the heated floor area
							 calculation, the heating equipment type(s), the minimum equipment efficiency,
							 and total installed heat capacity (by equipment type).
1.0
N/A
3.9
Gas-fired heat pump(s) meeting ANSI Z21.40.2 and
							 Z21.40.4 or CSA, with a minimum UEF of 1.15.
For R-2 Occupancy, gas-fired heat pump(s) meeting
							 ANSI Z21.40.2 and Z21.40.4 or CSA, with a minimum UEF of 1.15, shall serve all
							 units.
1.5
1.5
3.10f
Combination water heating and space heating system
							 shall include one of the following:
Gas-fired heat pump water heater(s) meeting Tier 2
							 of the NEEA Advanced Water Heating Specification for Gas-Fueled Residential
							 Storage Water Heaters Version 1.0.
or
For R-2 Occupancy, gas-fired heat pump water
							 heater(s) meeting Tier 2 of the NEEA Advanced Water Heating Specification for
							 Gas-Fueled Residential Storage Water Heaters Version 1.0., shall serve all
							 units.
or
For R-2 Occupancy, gas-fired heat pump(s) meeting
							 ANSI Z21.40.2 and Z21.40.4 or CSA, with a minimum UEF of 1.15, shall serve all
							 units.
To qualify to claim this credit, the building permit
							 drawings shall specify the option being selected and shall specify the water
							 heater equipment type and the minimum equipment efficiency and, for solar water
							 heating systems, the calculation of the minimum energy savings.
2.5
2.5
3.11c
Connected thermostat meeting ENERGY STAR Certified
							 Smart Thermostats/EPA ENERGY STAR specifications.
To qualify to claim this credit, the building permit
							 drawings shall specify the option being selected and shall specify the
							 thermostat model.
0.5
0.5
4.
HIGH EFFICIENCY HVAC
							 DISTRIBUTION SYSTEM OPTIONS
4.1
HVAC equipment and associated duct system(s)
							 installation shall comply with the requirements of Section R403.3.2.
Electric resistance heat, hydronic heating and
							 ductless heat pumps are not permitted under this option.
To qualify to claim this credit, the building permit
							 drawings shall specify the option being selected and shall specify the heating
							 equipment type and shall show the location of the heating and cooling equipment
							 and all the ductwork.
0.5
N/A
5.
EFFICIENT WATER HEATING
							 OPTIONS
Only one option from Items 5.3 through 5.8 may be
							 selected in this category. Items 5.1 and 5.2 may be combined with any
							 option.
5.1
A drain water heat recovery unit(s) shall be
							 installed, which captures wastewater heat from at least two showers, including
							 tub/shower combinations. It is acceptable, but not required, for sink water to
							 be connected. Unit shall have a minimum efficiency of 40% if installed for
							 equal flow or a minimum efficiency of 54% if installed for unequal flow. Such
							 units shall be rated in accordance with CSA B55.1 or IAPMO IGC 346-2017 and be
							 so labeled.
To qualify to claim this credit, the building permit
							 drawings shall include a plumbing diagram that specifies the drain water heat
							 recovery units and the plumbing layout needed to install it. Labels or other
							 documentation shall be provided that demonstrates that the unit complies with
							 the standard.
0.5
0.5
5.2
For Compact Hot Water Distribution system credit, the
							 volume shall store not more than 16 ounces of water between the nearest source
							 of heated water and the termination of the fixture supply pipe where calculated
							 using Section R403.5.2.
Construction documents
shall indicate
							 the ounces of water in piping between the hot water source and the termination
							 of the fixture supply. When the hot water source is the nearest primed plumbing
							 loop or trunk, this must be primed with an On Demand recirculation pump and
							 must run a dedicated ambient return line from the furthest fixture or end of
							 loop to the water heater.
To qualify for this credit, the dwelling must have a
							 minimum of 1.5 bathrooms.
0.5
0.5
5.3
Water heating system shall include the
							 following:
Energy Star rated gas or propane water heater with a
							 minimum UEF of 0.80.
To qualify to claim this credit, the building permit
							 drawings shall specify the option being selected and shall specify the water
							 heater equipment type and the minimum equipment efficiency.
0.5
0.5
5.4
Water heating system shall include one of the
							 following:
Energy Star rated gas or propane water heater with a
							 minimum UEF of 0.91.
or
Solar water heating supplementing a minimum standard
							 water heater. Solar water heating will provide a rated minimum savings of 85
							 therms or 2000 kWh based on the Solar Rating and Certification Corporation
							 (SRCC) Annual Performance of OG-300 Certified Solar Water Heating
							 Systems
or
Water heater heated by ground source heat pump
							 meeting the requirements of Option 3.4.
To qualify to claim this credit, the building permit
							 drawings shall specify the option being selected and shall specify the water
							 heater equipment type and the minimum equipment efficiency and, for solar water
							 heating systems, the calculation of the minimum energy savings.
1.0
1.0
5.5
Water heating system shall include one of the
							 following:
Gas-fired heat pump water heater(s) meeting Tier 2
							 of the NEEA Advanced Water Heating Specification for Gas-Fueled Residential
							 Storage Water Heaters Version 1.0.
or
For R-2 Occupancy, gas-fired heat pump water
							 heater(s) meeting Tier 2 of the NEEA Advanced Water Heating Specification for
							 Gas-Fueled Residential Storage Water Heaters Version 1.0. shall supply domestic
							 hot water to all units.
or
For R-2 Occupancy, gas-fired heat pump water
							 heater(s) meeting ANSI Z21.40.2 and Z21.40.4 or CSA, with a minimum UEF of
							 1.15, shall supply domestic hot water to all units.
To qualify to claim this credit, the building permit
							 drawings shall specify the option being selected and shall specify the water
							 heater equipment type and the minimum equipment efficiency and, for solar water
							 heating systems, the calculation of the minimum energy savings.
1.5
1.5
5.6
Water heating system shall include one of the
							 following:
Electric heat pump water heater meeting the standards
							 for Tier III of NEEA's advanced water heating specification.
or
For R-2 Occupancy, electric heat pump water
							 heater(s), meeting the standards for Tier III of NEEA's advanced water heating
							 specification, shall supply domestic hot water to all units. If one water
							 heater is serving more than one dwelling unit, all hot water supply and
							 recirculation piping shall be insulated with R-8 minimum pipe
							 insulation.
To qualify to claim this credit, the building permit
							 drawings shall specify the option being selected and shall specify the water
							 heater equipment type and the minimum equipment efficiency.
2.0
2.5
5.7
Water heating system shall include one of the
							 following: Electric heat pump water heater with a minimum UEF of 2.9 and
							 utilizing a split system configuration with the air-to-refrigerant heat
							 exchanger located outdoors. Equipment shall meet Section 4, requirements for
							 all units, of the NEEA standard
Advanced Water Heating
							 Specification
with the UEF noted above.
or
For R-2 Occupancy, electric heat pump water
							 heater(s), meeting the standards for Tier III of NEEA's advanced water heating
							 specification and utilizing a split system configuration with the
							 air-to-refrigerant heat exchanger located outdoors, shall supply domestic hot
							 water to all units. If one water heater is serving more than one dwelling unit,
							 all hot water supply and recirculation piping shall be insulated with R-8
							 minimum pipe insulation.
To qualify to claim this credit, the building permit
							 drawings shall specify the option being selected and shall specify the water
							 heater equipment type and the minimum equipment efficiency.
2.5
3.0
5.8
Combination water heating and space heating system
							 shall include one of the following:
Gas-fired heat pump water heater(s) meeting Tier 2
							 of the NEEA Advanced Water Heating Specification for Gas-Fueled Residential
							 Storage Water Heaters Version 1.0.
or
For R-2 Occupancy, gas-fired heat pump water
							 heater(s) meeting Tier 2 of the NEEA Advanced Water Heating Specification for
							 Gas-Fueled Residential Storage Water Heaters Version 1.0., shall supply all
							 units.
or
For R-2 Occupancy, gas-fired heat pump(s) meeting
							 ANSI Z21.40.2 and Z21.40.4 or CSA, with a minimum UEF of 1.15, shall supply all
							 units.
To qualify to claim this credit, the building permit
							 drawings shall specify the option being selected and shall specify the water
							 heater equipment type and the minimum equipment efficiency and, for solar water
							 heating systems, the calculation of the minimum energy savings.
2.5
2.5
6. RENEWABLE ELECTRIC ENERGY
							 OPTION
6.1
For each 600 kWh of electrical generation per housing
							 unit provided annually by on-site wind or solar equipment a 0.5 credit shall be
							 allowed, up to 4.5 credits. Generation shall be calculated as follows:
For solar electric systems, the design shall be
							 demonstrated to meet this requirement using the National Renewable Energy
							 Laboratory calculator PVWATTs or approved alternative by the code
							 official.
Documentation noting solar access shall be included
							 on the plans.
For wind generation projects designs shall document
							 annual power generation based on the following factors:
The wind turbine power curve; average annual wind
							 speed at the site; frequency distribution of the wind speed at the site and
							 height of the tower.
To qualify to claim this credit, the building permit
							 drawings shall specify the option being selected and shall show the
							 photovoltaic or wind turbine equipment type, provide documentation of solar and
							 wind access, and include a calculation of the minimum annual energy power
							 production.
0.5 - 4.5
0.5 - 4.5
7. APPLIANCE PACKAGE OPTION
7.1
All of the following appliances shall be new and
							 installed in the dwelling unit and shall meet the following standards:
1. Dishwasher, standard - Energy Star rated, Most
							 Efficient 2021
or
Dishwasher, compact - Energy Star rated (Version
							 6.0)
2. Refrigerator (if provided) - Energy Star rated
							 (Version 5.1)
3. Washing machine (Residential) - Energy Star rated
							 (Version 8.1)
4. Dryer - Energy Star rated, Most Efficient
							 2022
To qualify to claim this credit, the building permit
							 drawings shall specify the option being selected and shall show the appliance
							 type and provide documentation of Energy Star compliance. At the time of
							 inspection, all appliances shall be installed and connected to utilities. Dryer
							 ducts and exterior dryer vent caps are not permitted to be installed in the
dwelling unit
.
0.5
1.5
a An alternative heating source
				sized at a maximum of 0.5 Watts/ft2 (equivalent) of
				heated floor area or 500 Watts, whichever is bigger, may be installed in the
				dwelling unit.
b See Section R401.1 and
residential building
in Section R202 for Group R-2
				scope.
c Option 3.11 can only be taken with
				Options 3.1 and 3.3. To qualify to claim option 3.11 with 3.3, the system shall
				be a 1-2 speed heat pump system. Variabapacity heat pumps are ineligible from
				claiming this option.
d This option may only be claimed if
				serving System Type 4 or 5 from Table R406.2.
e Primary living areas include living,
				dining, kitchen, family rooms, and similar areas.
f Option 3.10 may only be taken with
				Efficient Water Heating Options 5.1 or 5.2. Equipment sizing for space heating
				shall be calculated as provided in Section R403.7 with increased capacity to
				provide a minimum of 75 percent of peak hot water demand or shall be sized in
				accordance with
approved
manufacturer's specifications or
				guidance. Supplementary heat for water heating system shall be in accordance
				with Section R403.5.7.
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.
Statutory
				Authority:
				RCW
				  19.27A.025,
				19.27A.045, and
				19.27.074. WSR 13-20-121, §
				51-11R-40621, filed 10/1/13, effective 11/1/13. Statutory Authority:
				RCW
				  19.27A.020,
				19.27A.045 and
				chapters
				19.27 and
				34.05 RCW. WSR 13-04-055, §
				51-11R-40621, filed 2/1/13, effective 7/1/13. WSR 13-20-001, §
				51-11R-40621, filed 9/18/2013, effective
				10/19/2013