Detailed Description  Compact Pressurized Solar Water Heater Description SKYLIGHT compact pressurized solar water heater takes advantage of the vacuum tubes which has the property of high absorptivity and low emissivity, and transfer swiftly the heat absorbed to the water by heat pipe inside the vacuum tubes. This kind of solar water heater can operate efficiently from summer to winter, and afraid not the frost cleft of the vacuum tubes. Specifications Inner tank Material S.S. SUS304-2B food grade Thickness mm 1.2-1.5 Out shell I Material S.S SUS304-2B food grade Thickness mm 0.5 Out shell II Material Al-Zn-alloy-coated coil sheet Thickness mm 0.5 Insulation mm 55 Frame I Material SUS 201 stainless steel Thickness mm 1.2 Frame II Material Galvanized steel Thickness mm 1.5 Evacuated Tube Specification Diameter × Length mm Ø58 x 1800 Vacuum degree Pa 3.3 x 10-3 Absorptivity 0.93 Emissivity Heat transfer power Kw/m2 26000 Anti-freeze -10 Anti hail mm DiameterFrame/ Connector Anti-wind m/s 26.5 Inlet outlet dimension G G1/2'' Models Model Aperture Area Vacuum Tubes Capacity GW  (kg) Loadage Container Dia. Length No. 20' 40' SLCPS58/16 2.64 m2 58mm 1800mm 16 113 L 69 49 85 SLCPS58/18 2.97 m2 58mm 1800mm 18 150 L 84 41 79 SLCPS58/20 3.30 m2 58mm 1800mm 20 165 L 90 37 71 SLCPS58/24 3.95 m2 58mm 1800mm 24 200 L 110 32 61 SLCPS58/30 4.94 m2 58mm 1800mm 30 250 L 130 25 48 SLCPS58/36 5.93 m2 58mm 1800mm 36 300 L 150 18 32