Low Pressure Vacuum Tube Solar Hot Water Heater with Backup Electrical Heater

Low Pressure Vacuum Tube Solar Hot Water Heater with Backup Electrical Heater. 3-Year Warranty Coverage: Comprehensive 3-year warranty for mechanical defects and performance issues. High Efficiency Heat Preservation: 50-60mm polyurethane foam ensures heat retention for up to 72 hours. Automatic Water Supply System: Assistant tank automatically refills water and stops when full without manual operation. Flexible Installation Options: Suitable for flat or inclined roofs with simple plug-in installation. Backup Electric Heating: Built-in electric heater provides hot water even without sunshine. Health-Safe Inner Material: Food grade SUS304-2B stainless steel inner tank with long-life silica gel seals. OEM/ODM Customization: Customizable outer tank material, frame, angle, and insulation based on detailed requests. Rapid Sample Delivery: Sample orders delivered within 3-7 days after deposit.