... used in hotel, school, gas station, train station, swimming pool and so on.Shinline- Leading professional solar water heating system ... commercial solar water heating applications2) Reliable, efficient, twin-glass solar tubes3) Polyurethane insulation ensures good heating performance and ... 2. Manifold (exterior): 304 stainless steel 304 BA3. Glass tube dimensions: 58mm x 1800mm 4. Insulation layer:5. ...