... years warranty Factory price Glass Tube Solar Water Heater with Solar Keymark1. Brief Introduction of glass tube solar water heater ... low reflection ratio.2. Feature of glass tube solar water heater 1) Highest efficiency2) Simple configuration3) ... counts: 15, 16, 18, 20, 22, 24, 26, 28, 304) Tube size: Φ47x 1, 500mm, φ58 x ... aloy plate4) Insulation: 50/55mm polyurethane Factory price solar water heater