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OPTION <br />DESCRIPTION <br />CREDIT(S) <br />4 <br />HIGH EFFICIENCY HVAC DISTRIBUTION SYSTEM: <br />1.0 <br />All heating and cooling system components installed inside the conditioned space. This <br />includes all equipment and distribution system components such as forced air ducts, <br />hydronic piping, hydronic floor heating loop, convectors and radiators. All combustion <br />equipment shall be direct vent or sealed combustion. <br />For forced air ducts: A maximum of 10 linear feet of return ducts and 5 linear feet of <br />supply ducts may be located outside the conditioned space. All metallic ducts located <br />outside the conditioned space must have both transverse and longitudinal joints sealed <br />with mastic. If flex ducts are used, they cannot contain splices. Flex duct connections <br />must be made with nylon straps and installed using a plastic strapping tensioning tool. <br />Ducts located outside the conditioned space must be insulated to a minimum of R-8. <br />Locating system components in conditioned crawl spaces is not permitted under this <br />option. <br />Electric resistance heat and ductless heat pumps are not permitted under this option. <br />Direct combustion heating equipment with AFUE less than 80% is not permitted under <br />this option. <br />To qualify to claim this credit, the building permit drawings shall specify the option <br />being selected and shall specify the heating equipment type and shall show the location <br />of the heating and cooling equipment and all the ductwork. <br />5a <br />EFFICIENT WATER HEATING 5.a: <br />0.5 <br />All showerhead and kitchen sink faucets installed in the house shall be rated at 1.75 <br />GPM or less. All other lavatory faucets shall be rated at 1.0 GPM or less.` <br />To qualify to claim this credit, the building permit drawings shall specify the option <br />being selected and shall specify the maximum flow rates for all showerheads, kitchen <br />sink faucets, and other lavatory faucets. <br />5b <br />EFFICIENT WATER HEATING 5b: <br />1.0 <br />Water heating system shall include one of the following: <br />Gas, propane or oil water heater with a minimum EF of 0.74 <br />or <br />Water heater heated by ground source heat pump meeting the requirements of Option <br />3c. <br />or <br />For R-2 occupancy, a central heat pump water heater with an EF greater than 2.0 that <br />would supply DHW to all the units through a central water loop insulated with R-8 <br />minimum pipe insulation. <br />To qualify to claim this credit, the building permit drawings shall specify the option <br />being selected and shall specify the water heater equipment type and the minimum <br />_ --• <br />r ` <br />equi went efficiency. <br />` 5 c <br />EFFICIENT WATER HEATING 5 c: <br />1.5 <br />Water heating system shall include one of the following: <br />N <br />Gas, propane or oil water heater with a minimum EF of 0.91 <br />or <br />Solar water heating supplementing a minimum standard water heater. Solar water <br />heating will provide a rated minimum savings of 85 therms or 2000 kWh based on the <br />Solar Rating and Certification Corporation (SRCC) Annual Performance of OG-300 <br />Certified Solar Water Heating Systems. <br />or <br />Electric heat pump water heater with a minimum EF of 2.0 and meeting the standards of <br />NEEA's Northern Climate Specifications for Heat Pump Water Heaters. <br />To qualify to claim this credit, the building permit drawings shall specify the option <br />being selected and shall specify the water heater equipment type and the minimum <br />equipment efficiency and, for solar water heating systems, the calculation of the <br />minimum energy savings. <br />RE-36 j / 2015 Washington State Energy Code <br />