pressurized solar water heater in details as following Product Information 1.with high quality vaccum tubes as solar collector,absorption percentage 91%-94% 2.module is made of galvanized steel ,or stainless steel 304,beautiful and durable 3 the water in the indoor-water tank is under pressure ,and the system work with not water circulating pump 4 working pressure0.6Mpa 5.heating pipe in the vaccum tube tubes are made of high quality copper ,with our special design ,more efficient 6.if one vacuum tube is damaged ,the whole machine can work normally ,as no other part is influenced ,replacement is convenient . 7.warm keeper of water tank in the module is asbestos and polyurethanes frothed ,thicness 50mm. 8.high quality stainless steel 202(or aluminum alloy)brackets are strong ,stable and windproof 1.Outerwatertank:SUS304-2Bstainles2.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. Feature 1) Collector separates with the storage tank. The tank can be put anywhere .... of the house 2) And the collector can be put on both tilted roof and flat roof.. 3) Module design, arbitrary combination, harmony with the building perfectly 4) Intelligent control and automatic operation 5) Anti-freeze no water inside the tubes when it works 6) The system controller has the anti-freezing function is that the temperature circulation will operate while it reaches the fixed temperature 7) Multifunction Bathing, washing, domestic heating 8) Workable at anytime and enjoyable..