CalMTA’s Residential Heat Pump Water Heating (HPWH) Market Transformation Initiative (MTI) aims to accelerate market adoption of heat pump water heaters in the single-family and small multifamily property sectors.
HPWHs offer a substantial grid and energy efficiency benefit to California’s housing stock and are a foundational technology for achieving the State’s decarbonization goals. CalMTA seeks to overcome these barriers by organizing and leveraging the substantial number of programs now working to drive adoption of this efficient technology through more than 30 different offerings. These programs along with initiatives from the California Air Resources Board (CARB) provide the right moment for CalMTA to harness market momentum and ensure that future policies will be successfully complied with.
This draft MTI Plan is based on more than two years of development, research, outreach, and analysis. Links to the supporting appendices are listed to the right. Additional appendices and the full plan will be available soon. CalMTA will submit this the full plan and appendices to the California Public Utilities Commission (CPUC) via an Application in spring 2026 following public comment and review by the Market Transformation Advisory Board (MTAB) in April.
Want to learn more about the Residential Heat Pump Water Heating MTI Plan? Read the FAQs.
This appendix includes the MTI’s full Logic Model. The Logic Model is a systematic and visual way of presenting CalMTA’s understanding of the interventions necessary to remove barriers, expected outcomes of those interventions, and a pathway to the desired end state. Access the FAQ here.
This appendix will detail the inputs, sources and methods used to develop the market forecasting, Total System Benefit (TSB), and cost-effectiveness model for this MTI.
This appendix will present the findings on the technology research conducted in Phase II and on behalf of the MTI.
This appendix includes the baseline assumptions and a thorough assessment of the market state, supply chain, market actors, and other programs that support the MTI. Access the FAQ here.
This appendix will describe how CalMTA will communicate and collaborate with key market actors and program stakeholders.
This appendix will describe the plan to track the progress and assess the impact of the MTI over time.
This appendix will document the potential risks and obstacles to the MTI and CalMTA plans to mitigate the risks.
This appendix will detail the budget requirements for the MTI.
This appendix will contain feedback on the MTI Plan from the Market Transformation Advisory Board.
2026 will be a pivotal year as CalMTA progresses beyond the program’s initial three-year start-up phase and moves California’s first Market Transformation Initiatives (MTIs) to implementation. Following the California Public Utilities Commission (CPUC)’s unanimous approval of the first-ever statewide energy efficiency MTIs in November 2025, CalMTA is authorized to immediately
This market characterization report is an output of the Phase II research for the Commercial Replacement and Attachment Window Solutions (CRAWS) Advancement Plan, finalized in September 2024. CRAWS in this report specifically refers to vacuum insulated glass (VIG) and commercial secondary windows (CSW). The CRAWS market transformation initiative (MTI) offers
The ENERGY STAR® Retail Products Platform (ESRPP) is a national collaborative initiative comprised of ENERGY STAR®, energy efficiency program sponsors and retailers that offers midstream incentives to encourage retailers to stock and promote energy-efficient products. As one of California’s newer sponsors of ESRPP, CalMTA designed the Geographic Targeting Using ESRPP
Q4 2025 Activity Report Webinar CalMTA continued to make substantial progress on market transformation initiative (MTI) development and operational milestones in the 4th quarter of 2025. In this webinar, the CalMTA team shared activities related to market transformation idea development, operations, financial status, and key outcomes including CPUC Decision 25-11-023
This report presents findings from a field study conducted at an Eden Housing apartment complex, Emerson Arms, where the team installed Copper’s “Charlie” model induction range to replace existing gas ranges. The study aimed to gather both quantitative and qualitative data to assess how users adapt to 120-volt (120V) battery-equipped
This Market Characterization Report is an output of the Phase II research for the Residential Heat Pump Water Heating (HPWH) Market Transformation Advancement Plan, finalized in September 2024. The plan outlined a high-level research approach that focused on investigating the target market, barriers, and opportunities with the goal of supporting
The California Market Transformation Administrator (CalMTA) develops and manages market transformation initiatives in the state to reduce energy use and reduce greenhouse gas (GHG) emissions.
CalMTA follows a rigorous process for reviewing, scoring, and then developing relevant, timely market transformation initiatives. The process supports market transformation initiative creation from concept to program development to market deployment, as well as the eventual exiting of the market.
Learn more about CalMTA’s planning and research on energy efficient technologies and our work to build California’s market transformation portfolio, and access quarterly and annual progress reports.
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Resource Innovations
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(888) 217-0217
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