... years guarantee 3. OEM service Compact Solar Water Heater with al-alloy bracketsDENO Compact Non-pressure solar water heaterFeatures:1. This system ... galvanized steel.3. Stand: galvanized steel with painting,or Aluminium alloy, or stainless steel.4. Water tank heat insulation layer: 50 ... ~60 mm polyurethane foam.5. Stand angle: 15 degree, 20 degree, 25 degree, 30 degree, 38 degree, ...