... special compressor first ,andit is a sepcial design for the heat pump water heater---R417A Compressor,the compressor is running completely within ... ,the integration of crystallayer and self-pressure layer make the water no "holes" can income, no "seams" can drill.The ... only inbathing, it also can provide a all-around domestic water for users, such as washing vegetables, cooking andso on. heat pump ...