Features: 1) Power-on self-testing 2) Water level pre-setting: 20%, 50%, 80%, ... 3) Water tem Features: 1) Power-on self-testing 2) Water level pre-setting: 20%, 50%, 80%, 100% ... temperature scope4) Water temperature instruction that: demonstrates the solar-powered water heater interior actual water temperature5) Water ... ) Automatic turbo-charged15) Pipeline heat preservation Intelligent Controller