the water tank is color steel, it is the non pressured solar water heater system.the system is five years life.
PRODUCT DESCRIPTION
· Material of Bracket: aluminum alloy
· Capacity: 100L--300L
· Vacuum Tube Size: 47 x 1,500mm / 58 x 1,800mm/70mmx2000mm
· Hail resistance: dia. 25mm hail
· Polyurethane thickness: 50mm
· Max Pressure Bearing: 0.6MPa
· Heat preservation: 72 hours
· Material of Inner TANK: FOOD STAINLESS STEEL(SUS304)
· Thickness of the inner tank: 0.4mm--0.5mm
· Heat preservation: 72 hours
· Layer of Heat Preservation: 50mm--60mm
· Material of out tank:Color steel
The system's life is five years