Detailed Product Description: 1) Reliable and efficient with twin-glass solar tubes 2) Easy plug-in installation 3) Outer tank material: colour steel-plate 4) Reliable and efficient with twin-glass solar tubes 5) Easy plug-in installation 6) Outer tank material: powder coated color steel sheet 7) Inner tank material: 0.4mm thick SUS304 food grade stainless steel plate 8) Frame material: color steel 9) Superior heat preservation ensured by 50 - 65mm polyurethane foam insulation laye |