The interior tank of Kaidun Water Heater is made of SUS304-2B high quality stainless steel sheet, so the quality of the water in the tank can be as good as the drinking water; this makes your shower more enjoyable. The joint between the interior tank and evacuated tube applies the double-inward-lock, and is processed by twice-reversal technique, so that the joint is closely combined with rubber-ring, and the water in the tank is safely locked. Kaidun anti-corrosive steel-clad interior tank satisfactorily solved the problems of rusting of interior tank and second-pollution of water, which are easy to find in many common solar water heaters. This makes the water heater of Kaidun the real hot-water center of the home.