... pressurized 4) 3 years warranty for evacuated tube solar collector 2012 hot sell heat pipe evacuated tube solar thermal collector (CE, ISO9001,CGC ... winter days.Specification:1).Vacuum tube: 58mm*1800mm,High borosilicate glass,hardness 3.3, with Al-N-AL coating2). Frame: ... 8)Tank capacity:135,150,165,200,250,300Liter StructureAll-glass double-tube co-axial structureGlass materialHigh borosilicate 3.3 ...