... Source Heat Pump 1.-25 DC low temp, EVI design 2.Cop to 4.8, 410A 3. House ... running in even -20 DC environment, avoid any antifreeze problem.Compare to the common series heat ... and outside evaporation enthalpy difference, brings 7% to 34% additional heating.Reliable Components1. Hitachi EVI ... aBigImageSrc } ); } )(); heat pump(evi air to water,low temp, -25 DC, split, CE, EN14511-2:2011, EN14511-2:2007 ...