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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 /> — ._... _.._ _...... - - -- . _.....---- — .....---....... <br /> Table 406.3—Energy Credits(Single Family) _...... ...... .. ........ ..... <br /> Option Description Credits:SF <br /> j S.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 <br /> f all 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 <br /> accordance 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 /> l <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 <br /> with the standard. <br /> .......... ............... ..._............. ....... <br /> Water heating system shall include one of the following: <br /> 5.2 Energy Star rated gas or propane water heater with a minimum UEF of 0.80.s 0.5 <br /> ----- .. ........_ .... . .__ ......... _...... <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 <br /> will 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 1 <br /> 5.3 Systems or 1,0 <br /> IWater heater heated by ground source heat pump meeting requirements of Option 3.3. <br /> i <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 /> jefficiency and,for solar water heating systems,the calculation of minimum energy savings. <br /> Water heating system shall include one of the following: <br /> j Electric heat pump water heater meeting the standards for Tier I of NEEA's advanced water <br /> j heating specification or j <br /> I <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 <br /> I <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 water heater <br /> j meeting the standards for Tier III of NEEA's advanced water heating specification or <br /> I 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 <br /> I recirculation piping shall be insulated with R 8 minimum pipe insulation.s <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 <br /> the 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.s <br /> all <br /> s To qualify to claim this credit,the building permit drawings shall specify the option being selected and sh <br /> specify the water heater equipment type and the minimum equipment efficiency <br /> .. .... .................................... <br /> ..... ... - - --- _._.. . - - . .. .:.. .. . <br /> Prescriptive Path--Single Family 2018 Washington State Energy Code-R 7 <br />