... working principle CE,ISO9001,SGS,CCC OEM is OK Non-pressurized solar water heater,compactSimple structure and working principleCost-optimalCE,ISO9001,SGS ... assistant tank,reflectorPacking:Export carton with full foamsRemark:Diameter of solar water tank(mm):360/460Vent connection(inch):1/2Water connection ... (47*1500);150/180/200/240/300/360L(58*1800) New Compact non-pressured solar water heater for 2013