Bontel Advantages: 1.The high weather-proof selective absorbing film from full-automatic magnetron sputtering production line developed by Bontel; 2.With Bonding heat transferring technology and laser welding technology; 3.High quality low-iron tempered glass with surface treatment to get high transmittance and low emittance; 4.Circulation fluid in closed copper pipes, no glass tubes. So collectors without corrosion and circulation fluid leaking; 5.The solid built-in absorber plate can absorb all solar radiation improve working efficiency and integrated well with buildings.