Solar water heater with SOLAR KEYMARK,ISO,CE,SGS - Automatically controlled - Highly efficient insulation with polyurethane low pressure olar water heaterMaterial:Inner tank: stainless steel SUS304/2B, δ0.41mmOuter tank: galvanized/color steel, δ0.31mmBracket: galvanized steel, δ1.5mmInsulation: polyurethane frothing, δ50mmVacuum tube: AL/N coating, 47×1500/58×1800mmAccessories: water auto- ...