... Air-source Heat Pump System *Heating,cooling,DHW *COP exceeds 4.0 *Reliable system,powerful control *CE Residential Air-source Heat Pump System1. Heating ... protection, high/ low pressure protection, water flow protection, high-temp protection, etc., and automatic defrost function, assuring the system to run ... 1m/4m/10m (dB(A)58/46/38Note: [1]The data of stable running condition (when defrosting,the ...