SFM Products Detail: Non-pressure solar thermal collector Model Number Tube Specification Tube Coating Daily Output( 131 Degree F) ( L/ Gal) SFM25-47/ 1500 47* 1500mm* 25 AL-N-AL 150-200/ 40-50 SFM50-47/ 1500 47* 1500mm* 50 AL-N-AL 300-380/ 80-100