PHNIX has brought simple design concept and appearance to the Comfort Series, guaranteeing best cost performance and stability at the same time. First, they are easier to control: on the front panel there are only three buttons: power, temp. up and temp. down. Second, receptable COP: as domestic pool heat pumps for most families, the classic series has a heating COP up to 5.1 (24°C / 19°C).