EVI china heat pumpdc frequency conversion heat pump is a multi-functional unit, creatively combining environmental protection R32 refrigerant with EVI full frequency conversion technology with very cost-effective, especially with A+++ ERP china  energy label, can be used in areas with very low climate temperature. Heating/cooling and domestic hot water is as low as -25°C. Free WiFi function and clear smartphone APP can be operated, china heat pump easy and intelligent control anytime and anywhere.   https://www.gomonnewenergy.com/china-heat-pump-water-heater-manufacturers.html