Scm Products detail: This is a split pressurized thermal collector, adopting vacuum tube heat pipe technology, is widely used for residential water heating, it's easy to install the tubes. Daily output of each tube is more than 2.6 gal per day. In some southern states, this number can be expanded. Service life of this collector can be 20 years plus. More technology data of this product please feel free to find on the products section or you can download our catalog and get more details. Manifold size 120*105 mm Pipe diameter / thickness 35/0.8 mm Interface 32 mm/ 3/4 inch Material aluminum alloy Heat pipe 14*70/8*1650 mm Vacuum tube 58/1800*1.8 mm Thermal material rock wool Absorption 94% Exchange efficiency 42% Max flux 0.58l/s Running pleasure 0.6 mpa Max idle temp 270 degree c Model number number of tubes absorber area daily output(131 degree f) Scm15-58/1800 15 pcs 1.95 m2(20.99 ft2) 105-150 l(30-40 gal) Scm20-58/1800 20 pcs 2.60 m2(27.99 ft2) 140-200 l(40-50 gal) Package volume: 0.288 cubic meter, gross weight: 58kgs