... 6. Service life can reach up to 15 years, Low maintenance cost7. Low noise, Safety, Easy installation, Intelligentized manipulation 8.15 ... Water Heater(air heat pump)1.Easy to install , low cost on it , low consumption2.Enery saveing , input power 4.6KW, Output ... ).LCD touch- screen controller.22.Automatic control:1).High/low pressure protection and sufficient water flow protection,automatic units on ...