... inner tank;9. Ideal for commercial solar water heater applications; Key Parameters of JiXiangQuan Solar Water Heater:Vacuum tubeLeading technology with ... of glass coating, heat efficient, D58 , L1800mm.Qty. of solar tubes12pcs, 16pcs, 18pcs, 20pcs, 24pcs, 30pcs, 36pcs.Inner tank0 ... After-sale services 15 years warranty Specifications of JiXiangQuan Solar Water Heater: ITEM NO.Qty of tubesDiameter of ...