... working principle CE,ISO9001,SGS,CCC OEM is OK Non-pressurized solar water heater,compactSimple structure and working principleCost-optimalCE,ISO9001,SGS,CCCOEM Material ... .5mm(JNYL),Stainless steel 0.4-0.5mm(JNQG)Vacuum tube:Single-targer/Three-target;47*1500/58*1800Bracket:Galvanized steel ... *1500);150/180/200/240/300/360L(58*1800) New Compact non-pressured solar water heater for 2013