Solar water heater Features 1. Internationally certified product 2. Reliable, efficient, double-layer glass evacuated tube 3. Copper transition heat pipe for rapid heat transfer 4. Easy plug-in installation 5. Maintenance free 6. Suitable for pressurized water heater system (up to 0.8mpa) 7. Corrosion resistant silver brazed copper condenser 8. All stainless steel frame and dark gray aluminium casing 9. Stable solar conversion throughout the day (tubes passively track the sun) 10. Freezing resistance: -35 c 11. Stagnation temperature: >220 c 12. The perfect solar collector for domestic solar water heater system and commercial application 13. Comprehensive 10 years limited warranty