solar water tank 1. CE, CCC, ISO,SRCC,SK approved 2. type range from 100L to 500L 3. 5years' guarantee Product DescriptionSolar water tank: 1.Inner tank: SUS304-2B stainless steel thickness 0.5mm 2.Outer tank: color steel thickness 0.5mm 3.surface: white antirust coating 4. Capacity:100L,150L,200L,250L,300L,400L,500L 5.Warranty:5 years warranty .