Baoguang high-efficiency vacuum tube,ideal for cold and low solar radiation area use. Excellent absorber coating CU/SS-ALN ensur

Baoguang high-efficiency vacuum tube,ideal for cold and low solar radiation area use. Excellent absorber coating CU/SS-ALN by long time plating,and  extremely  high temperature for air-exhausting ensure our solar vacuum tubes more durable and reliable.

vacuum tube for solar water heater