... Free maintenance; 5) Corrosion resistant materials; SpecificationSrModelSolar vacuum tubeTank CapacityLoading quantity/setsQty/pcsSize/mm(L)20GP40GP40HQ1TTS-10015 ... (SUS304 2B), Φ 360mm6Outer tankGalvanized steel, Φ 460mm7Insulation High-density polyurethane foam8BracketGalvanized steel, aluminum alloy steel, stainless ... Keymark, CCC, SGS, CE, ISO900114UsageBathroom high quality solar water heater