... sealed circulation 3.no scaling Water Cooling System for Pipe Welding Equipment High Efficiency Water Cooling System is the cooling unit of QGT-1 Series ... inner water (distilled water), no scaling.High efficiency of heat radiation, low cost, applicable to large power H.F ... equipment.Reservoir is used for outer water.Specifications for water-water heat exchange unit: 100KW: 1050*830*1370mm ...