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Economical and Practical Galvanized Steel Non-Pressurized Solar Water Heater. Long Service Life: Internal tank uses SUS304-2B stainless steel with argon arc welding for over 15 years life. Superior Insulation: High-density polyurethane foam keeps hot water temperature for 70 to 80 hours. Corrosion Resistant: Shell uses imported color steel plate; bracket is galvanized steel resistant to 140 km/h winds. OEM and ODM Services: Offers full customization, flexible customization, and customization from samples. Easy Installation: Designed for flat or inclined roofs with strong load-bearing and wind-resistant brackets. Smart Control Options: Optional intelligent controller for automatic hydration and auxiliary heating management.