Multifunctional Air to Water Heat Pump *3.5~28KW,DHW,heating,cooling *High COP, reliable system, ... supply hot water to warm house in winter, supply cold water to cool the house in summer, and provide sanitary water for ... below:1. Use Eco-friendly refrigerant R410A2. Use bigger heat exchanger than normal one, with higher efficiency3. Use world-known brand components ...