... 5.14 years manufacturer 2012 hot selling vacuum tube pressurized solar collector(CE,CCC,SRCC,Keymark) ... heat pipe in the Vaccum tube ,so no water will flow in the Vaccum tube.2.The manifold uses ... Copper 1.0mm thickness / 3/4 inch diameter2.Vaccum tube: 58*1800mm, 2.0mm thickness ALN/ AIN - ... resistance: 40mm8.Guarantee: Full system for 5years ,tube for 15yearsRemarks:1.Max.service temperature : 95°C ...