1. collector specification：size 130mm*130mm。（1）vacuum tube 1500mm/φ47，12pcs/setor 24tubes/set （2）vacuum tube 1800mm/φ58，15pcs/set，20pcs/set or 30pcs/set。
2. tank：150L，200L，300L
3. collector housing : 0.8mm stainless steel，frame 1.5mm stainless steel，insulation material: rock wool or polyurethane。
4. porcelain enamel inner tank, super-big magnesium rod, scale-resist, endure 21bar pressure
5．work normally if one tube damaged