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Big Water Tank High Pressure Solar Water Heater for Project. Large Capacity Options: Available in 500L to 5000L models for project use. Premium Inner Tank Material: Constructed with SUS304-2B or 316 food-grade stainless steel. Advanced Laser Welding: Ensures durability with laser welding technology on inner tank. High Efficiency Vacuum Tubes: Features 58mm tubes with high-efficiency coating up to 2100mm. Superior Heat Preservation: High density polyurethane insulation ensures 72 hours heat retention. Comprehensive Certifications: Certified with CE, ISO9001, and CCC standards. Long Warranty Period: Backed by an 8-year warranty for peace of mind. Stable Temperature Control: Separate hot and cold water flow for safe and comfortable use.