... water part system is split design for cold area to install inside the house. Thus, the ... design, can install inside the house in cold area to provide stable running and avoid any anfifreeze ... function(){ var aBigImageSrc = [ 'http://i01.i.aliimg.com/photo/v30/324979949_1/heat_pump_evi_air_to_water_low.jpg' , 'http://i01.i.aliimg ... EN14511-2:2011, EN14511-2:2007, NFPAC, EURO-VENT, ENERGY-STAR, DOE,ETL)