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• <br /> OPTION DESCRIPTION CREDIT(S) <br /> 5d EFFICIENT WATER HEATING 5d: 0.5 <br /> A drain water heat recovery unit(s)shall be installed,which captures waste water heat <br /> from all the showers,and has a minimum efficiency of 40%if installed for equal flow or <br /> a minimum efficiency of 52%if installed for unequal flow.Such units shall be rated in <br /> accordance with CSA B55.1 and be so labeled. <br /> To qualify to claim this credit,the building permit drawings shall include a plumbing <br /> diagram that specifies the drain water heat recovery units and the plumbing layout <br /> needed to install it and labels or other documentation shall be provided that <br /> demonstrates that the unit complies with the standard. <br /> 6 RENEWABLE ELECTRIC ENERGY: 0.5 <br /> For each 1200 kWh of electrical generation per housing unit provided annually by <br /> on-site wind or solar equipment a 0.5 credit shall be allowed,up to 3 credits.Generation <br /> shall be calculated as follows: <br /> For solar electric systems,the design shall be demonstrated to meet this requirement <br /> using the National Renewable Energy Laboratory calculator PVWATTs. <br /> Documentation noting solar access shall be included on the plans. <br /> For wind generation projects designs shall document annual power generation based on <br /> the following factors: <br /> The wind turbine power curve;average annual wind speed at the site;frequency <br /> distribution of the wind speed at the site and height of the tower. <br /> To qualify to claim this credit,the building permit drawings shall specify the option <br /> being selected and shall show the photovoltaic or wind turbine equipment type,provide <br /> documentation of solar and wind access,and include a calculation of the minimum <br /> annual energy power production. <br /> a. Projects using this option may not use Option la,lb or lc. <br /> b. Projects may only include credit from one space heating option,3a,3b,3c or 3d.When a housing unit has two pieces of <br /> equipment(i.e.,two furnaces)both must meet the standard to receive the credit. <br /> c. Plumbing Fixtures Flow Ratings.Low flow plumbing fixtures(water closets and urinals)and fittings(faucets and <br /> showerheads)shall comply with the following requirements: <br /> 1. Residential bathroom lavatory sink faucets:Maximum flow rate-3.8 L/min(1.0 gal/min)when tested in accordance <br /> with ASME A112.18.1/CSA B125.1. <br /> 2. Residential kitchen faucets:Maximum flow rate-6.6 L/min(1.75 gal/min)when tested in accordance with ASME <br /> All 2.18.1/CSA B125.1. <br /> 3. Residential showerheads:Maximum flow rate-6.6 L/min(1.75 gal/min)when tested in accordance with ASME <br /> A112.18.1/CSA B125.1. <br /> ) <br /> A <br /> 2015 Washington State Energy Code <br /> RE-37/ <br />