1, water tank 2. CE, CCC, ISO approved 3. type range from 100L to 500L 4. 5years' guarantee 5 ,5-20 days delivery . Product Description Split Pressurized Solar water tank: 1.Inner tank: SUS304-2B stainless steel thickness 1.2mm 2.Outer tank: color steel thickness 0.5mm 3.surface: white antirust coating 4. Capacity:100L,150L,200L,250L,300L,400L,500L With copper coil inside or not is optional