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2018 Washington State Energy Code—Residential <br /> Prescriptive Energy Code Compliance for All Climate Zones in Washington <br /> Single Family—New&Additions(effective February 1,2021) <br /> Table 406.3—Energy Credits(Single Family) <br /> Option Description Credits:SF <br /> 5. EFFICIENT WATER HEATING OPTIONS <br /> Only one option from Items 5.2 through 5.6 may be selected in this category.Item 5.1 may be combined with any option. - <br /> A drain water heat recovery unit(s)shall be installed,which captures waste water heat from all <br /> and only the showers,and has a minimum efficiency of 40%if installed for equal flow or a <br /> minimum efficiency of 54%if installed for unequal flow.Such units shall be rated in accordance <br /> with CSA B55.1 or IAPMO IGC 346-2017 and be so labeled. <br /> 5.1 0.5 <br /> To qualify to claim this credit,the building permit drawings shall include a plumbing diagram <br /> that specifies the drain water heat recovery units and the plumbing layout needed to install it. <br /> Labels or other documentation shall be provided that demonstrates that the unit complies with <br /> the standard. <br /> Water heating system shall include one of the following: <br /> 5.2 0.5 <br /> Energy Star rated gas or propane water heater with a minimum UEF of 0.80. 5 <br /> Water heating system shall include one of the following: <br /> Energy Star 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 will <br /> provide a rated minimum savings of 85 therms or 2000 kWh based on the Solar Rating and <br /> Certification Corporation(SRCC)Annual Performance of OG-300 Certified Solar Water Heating <br /> 5.3 Systems or 1.0 <br /> Water heater heated by ground source heat pump meeting requirements of Option 3.3. <br /> To qualify to claim this credit,the building permit drawings shall specify the option being <br /> selected and shall specify the water heater equipment type and the minimum equipment <br /> efficiency and,for solar water heating systems,the calculation of minimum energy savings. <br /> Water heating system shall include one of the following: <br /> Electric heat pump water heater meeting the standards for Tier I of NEEA's advanced water <br /> heating specification or <br /> 5.4 For R-2 Occupancy,electric heat pump water heater(s),meeting the standards for Tier I of 1.5 <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 recirculation <br /> piping shall be insulated with R-8 minimum pipe insulation. 5 <br /> Water heating system shall include one of the following: Electric heat pump water heater <br /> meeting the standards for Tier III of NEEA's advanced water heating specification or <br /> 5.5 For R-2 Occupancy,electric heat pump water heater(s),meeting the standards for Tier III of 2.0 <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 recirculation <br /> piping shall be insulated with R-8 minimum pipe insulation. 5 <br /> Water heating system shall include one of the following: <br /> Electric heat pump water 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 NEEA standard Advanced Water Heating <br /> Specification with the UEF noted above or <br /> 5.6 2.5 <br /> For R-2 Occupancy,electric heat pump water heater(s),meeting the standards for Tier III of <br /> NEEA's advanced water heating specification and utilizing a split system configuration with the <br /> air-to-refrigerant heat exchanger located outdoors,shall supply domestic hot water to all <br /> units.If 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. 5 <br /> 5 To qualify to claim this credit,the building permit drawings shall specify the option being selected and shall <br /> specify the water heater equipment type and the minimum equipment efficiency. <br /> Rev_10-27-22 Prescriptive Path—Single Family 2018 Washington State Energy Code-R 8 I n <br />