... avoid any anfifreeze problem.2. 43°C ~-25°C wide range use. EVI air to water heat pump is specially designed ... for house heating in cold area. The ambient temperature range is -25°C to 43°C. It can use safely ... , split, CE, EN14511-2:2011, EN14511-2:2007, NFPAC, EURO-VENT, ENERGY-STAR, DOE,ETL)