The Heat2O Heat Pump Water Heater is an all-electric, domestic hot water heating system designed to improve sustainability and reduce energy consumption in multifamily buildings and commercial facilities. Through energy-efficient operation and reduced on-site carbon emissions, Heat2O minimizes the environmental impact of producing high-volume domestic hot water. The heat pump uses CO2 refrigerant with a global warming potential (GWP) of one and an ozone depletion potential (ODP) of zero.