The absorption layer of inner tube outer surface will absorb solar energy and transfer it into heat. The heat will be transferred to the medium inside the tube. The medium then transfers the heat outside the tube to meet the water heating requirements. The reflecting arc of the inner wall of outside tube will reflect the light into inner tube and improve the heat collecting of the tube. 

Heat collecting of inner focusing vacuum tube  

1. Inner focusing film technology
High heat collecting efficiency, super low emission, reliable and long life span
2. Heat pipe technology
No water flow, no explosion risk, anti-scale accumulation, anti-over heat, fast start
3. Inner reflecting mirror
High reflecting efficiency, long life span 

QA & Test Center
1. Himin solar testing center was established in 1997, including 24 testing laboratories, with more than 1000 testing items.
2. Himin solar testing center has passed the CNAS certificate, whose testing report has same effect with China National testing report, also is the first ISO9459 international standard testing center in China.
3. The testing domain covers solar water heater, fittings (vacuum tube, water tank, bracket, etc.), solar PV module, energy-saving materials, and so on.