... 11)Tank capacity:135,150,165,200,250,300Liter12)Product Weight:about 72,82,98,110,136,156Kg vacuume tube ... Absorption efficiency≥93% (AM1.5)Emissivity≤5%Vacuum≤3x10-3PaHeat Loss≤0.6W/ ( m2oC ) DescripitNon-pressurized solar water heaterinner tank ... KWAverage Heat Loss CoefficientUlt=0.4~0.6W/( m².°C)solar water heater bracketstainless steel/Galvanized steel/Aluminium alloy 2013 High Quality Pressure ...