Indirect solar hot water system (copper coil). The main working principle adopts heat exchange technology. The cold water inside the vacuum tube is heated by solar radiation, and then the hot water rises to the tank, the cold water in the tank flows into the vacuum tube.

Hot and cold water form a natural circulation inside this system. The cold water from the house enters through the coil (copper coil), without secondary contamination. The hot water inside the tank transfers heat to the water inside the copper coil at the moment of opening the hot water tap, so people use hot water directly from the coil.

This system is depressurised, but a pressurised system can also be manufactured with the same operation.

Technical Details

Component of Production:

1. Material of Inner Tank: SUS304-2B Stainless Steel, thickness: 0.4mm, (optional 0.5mm, 0.6mm).
2. Material of Outer Tank: Stainless steel, thickness: 0.31mm/0.4mm
3. Copper Coil: diameter : 12mm, thickness: 1mm
4. Heat Preservation : polyurethane foam with 55mm thickness
5. Magnetic-controlled Al-N-Al splash all glass evacuated heat-collecting tubes
6. Specification vacuum tubes : Φ58mm*1800mm
7. Material of Support: Stainless steel ,thickness: 1.2mm/1.5mm
8. Capacity: 100L-300L

System Work Principle:

1. The vacuum tube collector absorb the heat energy to heat the water in heat storage tank.
2. When using the hot water, the cold water flows through the inlet, the copper coil absorb the heat then transfer into the cold water ,so that the temperature rise up ceaseless.
3. For the original features of the copper coil, the water temperature of the outlet is close to the water temperature of the water tank (≤3℃) , so the high pressure of the cold water into the copper coil and absorb the temperature, at last the water can be used.