... of 30%), further guarantee the ultra-low-temperature (-15 ° C) heating and ultra-high temperature (45 ° C) under normal circumstances refrigeration ... of 4.0. Air source hot water heat pump(instant & circulating)1. instant heating,the cop is more than 4.0, heat the ... defrost, power-fail memory,charge adjustment system,with booking timed heating,LCD display remote control and clock. circulating1:the cop ...