Large heating commercial air source heat pumps,Green R407C, Easy installation,with or without buffer water tank for option 1. ... option.4. Reverse cycle valve,Flow switch for water flow protection.5. Intelligent controller and adjustment ... antifreezing,phase order,discharge temp,etc. 7. Air exchanger(Fins-coil)with hydrophilic coating,Automatic defrosting ... the factory. 88kw heating commercial heat pump