. High heat collecting efficiency , at least 20% upgrade than common solar system.,
2. Rapid heat conduction, the speed of heat conduction is 1000 times than the performance of copper,
3. Special silica gel for sealing up is not easy to aging, release automatically when high temperature or high pressure in heat pipes.
4. Standard: 47-1500//58-1800
Printable Vacuum tube collector, Imprinted,
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