... solar water heaters(ss)1.CE,ISO9001,CCC, 2. Anti-freezen & USD 8-10 per hole3. 15Years Warranty for ... advance: the use of more safe, non-troubled waters, anti-burst, antifreeze, E-nrichment process.Collector device:φ47×1500,φ58×1800Nano ... polyurethane foamTank shell:White ceramic plate special anti-corrosionStent material: zinc-based anti-corrosion steel plate thickeningWorking pressure: no pressure ...