... High COP, 75%Energy-saving5. Automatical high/low pressure protection 6. Service life can reach ... up to 15 years, Low maintenance cost7. Low noise, Safety, Easy installation, Intelligentized manipulation ... heat pump)1.Easy to install , low cost on it , low consumption2.Enery saveing , input power 4. ... controller.22.Automatic control:1).High/low pressure protection and sufficient water flow protection ...