EPA's Energy Star website for heat pump water heaters - A place to find information about product efficiencies, rebates, and more. https://www.energystar.gov/products/heat_pump_water_heaters
Advanced Water Heating Initiative - A way for interested contractors, manufacturers, designers, utilities, and others to learn from each other in promoting heat pump water heaters. https://www.advancedwaterheatinginitiative.org/community
Small Planet Supply - The website of a supplier that offers Sanden CO2 heat pumps. https://www.smallplanetsupply.com/sanc02
Guidelines
Energy Star Website: https://www.energystar.gov/partner-resources/residential_new/educational_resources/sup_program_guidance/heat_pump_water_heater_guide/design_considerations
CO2 Heat Pump Water Heaters for Multifamily Buildings; A Quick Design Guide, EPRI, CEC EPC-19-030.
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