This report is a Product Profile focusing on Air-source Heat Pump Water Heaters used for residential water heating. Air-source heat pump water heaters are a type of water heater that use a refrigerant fluid to absorb heat from the outside air and transfer it to water stored in a tank. This Product Profile provides the basis for consultation with industry, community and other stakeholders on options to improve the energy efficiency of air-source heat pump water heaters, as well as the potential for introducing other functional performance requirements.