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11 <br />E <br />2018 Washington State Energv Code —.Residential <br />Prescriptive Ene,rgv Code iCompliance for All Climate Zones in Washington <br />Single family— New & Additions (effective February 1, 2021) <br />Table 406.3 — Energy credits Si le Family) <br />opcmm Description Credits: SF <br />5. EFRaENT WATER HEATiNG OPTIONS <br />only ome option from Items 5-2 through 5_6 may be selected in this catWry- Item 5.1 may be combined with any option. <br />drain eater heat recovery uaitls; shall be installed, which captures wastewater heat from <br />all and only the showers, and has a minimum efficiency of % if installed for equal flow or a <br />minimum efficiency of 54% if installed for unequal flow. Such units she I be rated in <br />accordance with CSA B55.1 or IAPh1O IGC 346-2017 and be so labeled, <br />§.1 <br />0 5 <br />o ,qualify to claim this credit, the building permit drawings shall includ=- a plumbing diagram <br />at specifms t he drain water heat recovery units and the plumbin layout needed tc: insta<l it <br />bels or other documentati€�n shall be pravided that demonstrates that the unit co r„ pl ies <br />F <br />th the standard. <br />Water heating system shall include one of the following: <br />5-2 <br />Energy Star rated gas or propane water heater with a minimum UEF of 0.84- <br />Q-5 <br />Water heating system shali include one of the fallowing: <br />Energy Starr rated gas or propane water heater with a minimum UEF of 0.91 or <br />Solar water heating supplementing a minimum standard water heater. Solar water heating <br />ill provide a rated minimum savings of S5 therms or 200€1 kWh based on the Solar Rating and <br />Certification Caorporation (SRCCI Annual Performance of OG-504 Certified Solar Water Heating <br />5.3 <br />Systems or <br />1-0 <br />Water heater heated bey ground source heat pump meeting requirements of option 3.3. <br />To qualify to claim this credit, the building perm it dra wings shall specify the option being <br />lselectad <br />and shall specify Live eater heater equipment type and the min imum. equipment <br />efficienc_, and, for solar water heating systems, the calculation of minimum energy savings_ <br />Water heating system shall incl ude one of the fallowing: <br />Electric heat pump water heater meeting the standards for Tier I of NEEA's advanced &atsr <br />treating specification or <br />5.4 <br />For R-2 Occupancy, electric heat pump water heater(sr, meeting the standards for Tier I of <br />2-5 <br />NEEA's advanced water heating specification, shall supply domestic hot water to all units. if <br />one water heater is serving more than one dwelling unit, all hot water supply and <br />recirculation piping shall be insulated with R-8 minimum pipe insulation.' <br />Water heating system shall include one of the following: Electric heat pump rater heater <br />meeting the standards for Tier IEI of NEEA's advanced water heating specification or <br />5.5 <br />For R-2 Occupancy, electric heat pump water heaten;s;:, reeding the standards for Tier III of <br />2 0 <br />NEEA's advanced water heating specification, shall supply domestic hot water to a! I units. If <br />one water heater is serving more than one dwelling unit, all hot inter supply and <br />recirculation piping shall be insulated with R-8 minimum pipe insulation. a <br />Water heating system shall include one of the following: <br />Electric heat pump eater heater with a minimum UEF of 2.9 and utilizing a split system <br />configuration with the air -to -refrigerant heat exchanger located outdoors. Equipment shall <br />meet Section 4, requirements for all units, of the NE_A standard Advanced water ,Meeting <br />Specification with the UEF noted above or <br />5.6 2S <br />For R-2 Occupancy. electric heat pump water heaten;s,, meeting the standards for Tier III of <br />NEEA's advanced water heating specification and utilizing a split system configuration with <br />the air -to -refrigerant heatexchanger located outdoors, shall supply domestic hot -water to all <br />units_ f one water heater is serving more than one dwelling unit;_, all hot water supply and <br />recirculation piping shail be insulated with R4 minimum pipe insu'ation_' <br />Toquaiitifyto claim this credit, the buitding permit drawings shall specify the option bei-ng selected and shall <br />spec*V the water heater eg4me-nttype any: the minimum equipment efficiency. <br />ores *% R3111— :_ Inge Farnt} 231' IN 3snligtc-n slate E'ie,� Cone <br />