Non-pressure solar water heaters(ss) 1.CE,ISO9001,CCC, 2 ... per hole 3. 15Years Warranty for vacuum tu Non-pressure solar water heaters(ss)1.CE,ISO9001,CCC, 2. ... tube to a smaller loss of reduction.Super super frame, in line with the princi-ple of fluid mechanics, elegant fashion, ... material: zinc-based anti-corrosion steel plate thickeningWorking pressure: no pressure to runWater method: water law. Non ...