50mm PUF Liquid Glass compact size field design 9mm evaporator heat exchanger High Efficiency coated Tank Cover Special Compressor Hydrophilic coating International Design ultra-quiet operation 25% higher efficiency high class performance Hot Water Storage Tank 4mm-5mm Pressurized tank first class energy level commercial building places product internal structure large heat exchanging area DOMESTIC AIR SOURCE HEAT PUMP Heat Pump dedicated rotary Compressor