... Air to Water *High COP at low temperature *Heating,cooling,doemstic water *CE,RoHS Heat Pump Air to WaterAir to Water ... , Emerson ALCO expansion valve, Siemens electric, etc., high quality and reliability5. Intelligent microprocessor control with heating curve ... water flow protection, high-temp protection, etc., and automatic defrost function, assuring the system to run safely and efficiently ...