Design Guide: CO2 Heat Pump Water Heaters for Multifamily Buildings


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This CO2 Heat Pump Water Heaters for Multifamily Buildings Design Guide was produced as part of the 2020 grant award EPC 19-030 “Large Capacity CO2 Central Heat Pump Water Heating Technology Evaluation and Demonstration project,” sponsored by the California Energy Commission’s Electric Program Investment Charge Program (EPIC). The guide was developed by Ecotope with the collaboration of the Association for Energy Affordability (AEA), the Electric Power Research Institute (EPRI) and New Buildings Institute (NBI).

The guide is intended as a reference for designing central commercial heat pump water heating systems that use CO2 technology. The guide focuses on system sizing and design using the Mitsubishi HEAT2O™, but the guide can be applied to other similar heat pump water heater systems. The information in this guide can be used by developers, engineers, and architects to understand how central commercial heat pump water heaters can fit into a multifamily housing project, whether it is a full renovation, a technology upgrade, or a new build.

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