... ,ISO9001,SGS,CCC OEM is OK Non-pressurized solar water heater,compactSimple structure and working principleCost-optimalCE,ISO9001,SGS,CCCOEM Material ... :Galvanized steel/Stainless steel/Aluminum alloy steelInsulation:Polyurethane,50mm(JNYL),50-60mm(JNQG)Optional spare parts:Electric heater,magnesium rod,assistant tank ... /300/360L(58*1800) New Compact non-pressured solar water heater for 2013