Advantage: 1) Crafted with precision, both the outer and inner tanks boast top-of-the-line SUS304 2B stainless steel, ensuring unparalleled durability and strength. 2) Experience longevity with our vacuum tubes, designed to perform optimally for an impressive 15 years. 3) Delivering unwavering stability and reliability, our product stands resilient against various challenges. 4) Achieve exceptional thermal efficiency: basking in sunlight, the temperature reaches a scorching 250°C, swiftly bringing water to a boil in just 2.5 hours using a single tube. 5) Superior protection against natural elements, capable of withstanding hailstones up to 25mm with ease. 6) Remarkable heat retention, maintaining warmth effortlessly for up to 72 hours. 7) Enhance convenience with optional accessories: an assistant tank and an electric heater for tailored solutions. 8) Enjoy peace of mind with our comprehensive 5-year warranty, a testament to our commitment to quality.