Automatic control: 
1). High/low pressure protection and sufficient water flow protection, automatic units on/off timeclock 
2). Automatic reversing defrosting function enables units to work reliablely in hard winter 
3). Units run automaticlly according to setted water temperature. 

Special defrosting technology makes the heat pump more efficient, higher COP 
Special heat exchanger designs provide excellent performance at low ambient temperature and high humidity.