SUNCHI ON/OFF Heat Pump Water Heater has world famous brand compressors ,digital LED display and intelligent defrosting.The ON/OFF heat pump water heater uses high efficient and ECO friendly refrigerant, no pollution. It also has multi self-protection functions, including high & low pressure, high temperature, water flow and antifreeze protection. SUNCHI ON/OFF Heat Pump Water Heater works stable and has a long using life.