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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 />. 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 am <br />A drain water heat recovery unit(s) shall be installed, which captures waste water heat from <br />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 <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 <br />with the standard. <br />5.2 Water heating system shall include one of the following: <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 <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 <br />5.3 Systems or <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 />efficiencv and, for solar water heatine systems, the calculation of minimum enerev savines. <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 <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. 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 <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. 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 />5.6 Specification with the UEF noted above or <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. 5 <br />option. <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 />0.5 <br />0.5 <br />1.0 <br />1.5 <br />2.0 <br />2.5 <br />Prescriptive Path — Single Family 2018 Washington State Energy Code-R <br />