 
Uses an electrical heater to heat water during cloudy day or at night, liguid (pure water or glycol) in the U pipe heats up, and the U pipe conducts thermal energy to the water inside the storage tank through internal copper coils.
As the water temperature can be adjusted using an automatic controller, user can get hot water all day long.
Solar water heaters can still work even with several tubes broken. With a testing pressure of 12 bar, this system has a working pressure of 6 bar.
| appellation | Gu-2.0-58×1500/12 | Gu-2.4-58×1500/12 | 
| Type of class Tube | φ58×1500mm | φ58×1500mm | 
| Number of Tube | 12 | 12 | 
| U copper Type | φ10×0.6mm | φ10×0.6mm | 
| Insulation | CFC Free | |
| Fluid Type | Glycol solution | |
| Fluid content | 2.7SL | 3.1SL | 
| Tested pressure | 12 bar | 12 bar | 
| System pressure | 6 bar | 6 bar | 
| Cut length of efficiency | =50% | =50% | 
| Length/width/Height | 1724×1000×185mm | 2024×1060×185mm | 
| Net Weight | 40kg | 50kg | 
| Packing Dimension | 1760×1100×200mm | 2060×1100×200mm | 
| Gross weight | 50kg | 60kg | 

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