2.2 Japan

‘Eco Cute’ is a name given to residential and commercial heat pump water heaters in Japan that use carbon dioxide (CO2) as refrigerant. Commercial air-to-water (ATW) heat pump water heaters also include those that use HFC refrigerant (R410A). In addition to these water heaters, in recent years the market for hybrid systems combining an electrically driven heat pump and gas combustion system has also increased.