Solar Thermal Systems 1.High quality products 2.Overseas hot products 3.Best service 4.Beautiful design Solar Thermal SystemsCertificate:CE, KEYMARK, SRCC,ISO , CCC ... 25mm 9.Quality guarantee:10 yearsFeatures:1. This type of solar collectors works with high pressure.2. It uses the heat ... efficient, twin-glass6. Simplistic plug-in installation7. Minimal maintenance required Solar Thermal Systems