1,Manufacturer of solar water heater 2,OEM service 3,Much low price,high configuration SUS304-BA , ... of outer tankSUS304-2B , 0.55mmmaterial of inner tankSUS202 , 1.2 mmmaterial of frameThree high vacuum tube , ALN/AIN-SS/CU ... openinigpolyurethane foam , thickness : 55 mm , 32 kg/m3Heat insulation of water tank all stainless steel solar water heater