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20tubes White Color Steel Pressurized Copper Coil Solar Water Heater. High Efficiency Heating: Tri-target vacuum tube with patent interference coating improves efficiency by 12%. Instant Continuous Hot Water: Copper coil heat exchanger provides direct tap water connection for instant supply. Durable Stainless Steel Tank: Food-grade SUS304-2B inner tank ensures clean water and lifespan over 15 years. Long Heat Retention: High-density polyurethane insulation preserves heat for 70 to 80 hours. Weather Resistant Construction: Galvanized steel bracket withstands 140 km/hr winds and acid rain. Comprehensive Warranty: 3 years for system exchange and 15 years for vacuum tube compensation.