40-60tubes Top Quality Butterfly Type Color Steel Vacuum Tube Solar Collector

40-60tubes Top Quality Butterfly Type Color Steel Vacuum Tube Solar Collector. Durable Vacuum Tubes: Borosilicate glass tubes with Cu-SS-ALN/AIN coating, 15-year warranty. Corrosion Resistant Shell: Stainless steel shell and bracket resist acid rain and erosion effectively. Flexible Customization: Full customization and flexible customization options available via OEM/ODM. High Efficiency Design: All-glass vacuum tubes offer economical performance for large-scale heating. Easy Installation: Simple connection design requires little maintenance for long-term use. Food-Grade Materials: Inner manifold uses food-grade SUS304-2B stainless steel for safety. Strong Hail Resistance: Withstands hail up to 25mm diameter when tilt angle is 40 degrees or more.