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additional labor ($12,000). Although these are rough estimates, they are estimates for central DHW installations where contractors are more familiar with the equipment and installation process. Additionally, these estimates suggest that existing utility incentives could substantially offset installation costs (estimated total at $41,000). Based on these estimates, the installation costs (and therefore the payback period) at the Site were perhaps three times what they could be. To support reduced design costs for future projects, Ecotope is working to develop system configuration and sizing guidelines that should minimize required engineering7. Table 2. HPWH Retrofit Installation Cost Calculations Site Energy Use & Cost Calculations Building and Site Characteristics Annual Water Usage Annual ERWH Electric Use Electricity cost HPWH DHW System ERWH Annual HWC losses Annual ERWH Electric Use Annual HWC ERWH temperature 438,000 Gal/yr. 76,083 kWh/yr. 0.11* $/kWh Equipment Efficiency Baseline Electric Water Heating (ERWH) System maintenance 3.3 COP 0.98 COP Hot Water Circulation System 7,700 kWh/yr. 76,083 kWh/yr. 7,857 kWh/yr. Proposed Heat Pump Water Heating (HPWH) System Annual HPWH Electric Use Annual HWC HPWH reheat Electric Savings Bill Savings (@ $0.11/kWh) Retrofit Installation Costs Potential Incentive Net Cost (w/ Incentives) Simple Payback Simple Payback w/o Incentives 23,055 kWh/yr. 2,333 kWh/yr. Proposed HPWH System Savings 58,511 kWh/yr. $6,441 $/yr. Proposed HPWH System Savings $117,840 $ $30,000 $ $87,840 $ 13.6 18.3 yr. yr. https://exemplarybuilding.housingconsortium.org/ 7 Design and sizing guideline support work funded by Seattle City Light to support the Exemplary Building Consortium. *https://www.bls.gov/regions/west/news-release/averageenergyprices_seattle.htm Pilot Program of the Housing Development BONNEVILLE POWER ADMINISTRATION 20PDF Image | CO2 Heat Pump Water Heater Multifamily Retrofit
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