1.How distinguishes Vacuum Tube the quality quality?

2.How distinguishes the Heat Pipe Collector the quality quality?

3.What Type of Solar Systems do you needs ?

4.How much energy can a solar collector produce?

5.Why is knowing the insolation level useful

6.How to design a Solar system?

7.Do you Know Solar Products in China who is the best of quality and price?

For more information about solar thermal application(back up/pool heating/space heating...),you shoud accept a professional coach.