Plug-in 120V HPWH Measure Package Updates to eTRM

This research highlights the energy and cost-saving potential of 120V plug-in heat pump water heaters (HPWHs), emphasizing their flexibility and reduced need for electrical infrastructure upgrades. These systems, with a UEF of 2.6 or higher, provide a cost-effective and easily deployable solution for residential water heating, addressing a critical market gap. Key eligibility considerations have been identified to ensure effective implementation and maximize savings through updates to SWWH025 (Residential Heat Pump Water Heater for fuel substitution) and SWWH014 (Heat Pump Water Heater, Residential) measure packages. Recommendations include integrating these systems into the California Electronic Technical Reference Manual (eTRM) to support utilities in targeting hard-to-reach and disadvantaged communities. Innovative approaches, such as fixed-cost, same-day emergency replacement programs, are proposed to enhance deployment and savings.