... OEM is OK Non-pressurized solar water heater,compactSimple structure and working principleCost-optimalCE,ISO9001,SGS,CCCOEM Material:Inner tank:Stainless steel SUS 304,0 ... with full foamsRemark:Diameter of solar water tank(mm):360/460Vent connection(inch):1/2Water connection(inch):1/2,3/4Hail resistance: ... 150/180/200/240/300/360L(58*1800) New Compact non-pressured solar water heater for 2013