... 4. Buyer label offered Supply Kinds of Solar Boilers(Solar Water Tanks) - Factory Details: Capacity: 80L,100L,150L,200L,250L,300L,400L ... ,500L,600L,800L,1000L,1200LMaterial of inner tank: Stainless steel 304 or 316,good gradeMaterial of outer tank: Stainless ... foamCoils in tank as heat exchanger: copper coils or stainless steel coilsQuantity of coils: Can be single,double,there or fourWorking ...