Case Study: Bayview Towers Hot Water Load Shift Demonstration and Simulation Analysis


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The Bayview Tower project retrofitted an aging electric resistance water heating system in an occupied, 100-unit, affordable housing high-rise located in Seattle, Washington. The new commercial heat pump water heating system at Bayview Towers marked the first United States installation of Mitsubishi's HEAT2O (QAHV) system—the first large-capacity CO2 refrigerant-based domestic water heating system. It is also the first installation of a load shift-capable commercial HPWH system nationwide.

The Bayview Tower project marks asignificant milestone in market transformation of load shift capable water heating systems. The monitoring and studying of the system have yielded valuable insights, which will be used to improve the product and inform future large-scale implementation of load shifting HPWH systems. The findings prove that commercial HPWH systems can realize consistent load reduction during peak periods, which will play an essential role in supporting the transition to renewable energy, drive electrification, and help with grid stability.

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