At a load of 5.00 kW, System B (SE GVSUPS10K0B4FS - ECO Mode) is more efficient than System A (SE E3SUPS10KFB1 - Double Conversion), which results in 266 W of heat load reduction, € 235 or 2,330 kWh in annual electrical savings, and 1,415 kg of avoided CO2 emissions per year.