... seperated from water heated by refrigerant directly 1. Made from stainless steel2. Polyurehane foam insulation3. 100L,200L,300L,400L,500L4. Optional ... inner tank is made of SUS304 stainless steel,galvanized zinc steel outer case. HISEER stainless steel boiler, CE certification, Domestic Hot Water Tank with copper or stainless steel Coil ...