1.color paint steel material,unpressurized 2.ISO,CCC,CE,5years warranty,OEM ... .Outer tank:0.4mm thickness SS202 stainless steel 3.Absorbing layer: high-pressure polyurethane foam with 55mm thickness 4.foaming ... capacity: 100L,150L,200L,240L,300L,360LBracket: 1. galvanized steel or aluminum alloy with 1.5mm thickness; 2.Angle of ... pipe is open to the air. Related products: low pressure solar water heater