Pressurized solar water heater(EN12975.CCC.CE) in details as following Product Information 1.Dimension of vacuum tubes: 47mm.1500mm.58mm. 1800mm 2.Evacuated tube:Borosilicate glass3.3 thickness: 2.0 mm Hail resistance: 25 mm 3: Absorbing rate> 93% 4: Number of tubes: 15 - 36 5:Out tank shell:color armor plate/stainless steel,thickness: 0.4mm/0.5mm/0.6mm 6:Inner than: 304 2B food grade stainless steel, thickness: 0.4mm/0.5mm/0.6mm 7:Insulation layer: high density import PU without Fluorin,thickness:55mm 8: Heat Prevention: 72 - 80 hours 9: Frame: galvanized and plastic spraying coated/stainless steel / aluminum sheet 10: Accessories: Stainless steel screws and nuts Inner tank used pressurized tank cover,it is not flat.thus in none pressure solar water heater the test press is 2 bar. 1.Outerwatertank:SUS304-2Bstainlesssteel(foodclass),0.4mmthickness2.Innerwatertank:SUS304-2Bstainlesssteel(foodclass),0.4mmthickness3.Vacuumtube:highqualityborosilicateglass,AL-N-ALcoating,1.5mmthickness4.HeatPreservation:PolyurethaneFoam,50mmthickness,keepinghotwahterwarmfor72hours5.Bracket:SUS304stainlesssteel,1.2mmthickness6.Hailresistance:25mmdiameterModelVacuumTubeSizeCapacityAreaWaterTankDiameterVolumeLoadingQuantity(sets)DiameterLengthQuantityOuterTankInnerTank20'GP40'GP40'HQJJL-A158mm1800mm15pipes128L1.92460mm360mm0.59CBM4491115JJL-A258mm1800mm16pipes136L2.05460mm360mm0.63CBM4185107JJL-A358mm1800mm18pipes152L2.31460mm360mm0.69CBM377898JJL-A458mm1800mm20pipes167L2.57460mm360mm0.74CBM357291JJL-A558mm1800mm24pipes198L3.1460mm360mm0.89CBM296076JJL-A658mm1800mm30pipes244L3.62460mm360mm1.09CBM234962JJL-A758mm1800mm36pipes291L3.89460mm360mm1.29CBM204152CommitmentofService1.Fiveyearswarrantyfromthedateofpurchaseforallqualityproblems.2.Qualityproblemsduetomanufacturer,wecanrepairthemfreeforcustomers.3.Qualityproblemsduetomisusebycustomersshallberepairedinchargeofthecost.4.Customerisnotallowedtodismantleorrepairbyhimself,oralllosseswillnotbepaidbyus.