... of rates, sizes and sheath materials suitable for the heating requirements of water, air and other gases. Flanged ... heaters?Pls check the table as follows: Copper SheathWater heating, water solutions non-corrosive to copper.Stainless Steel ... . Stainless steel 304 is the normal material.Incoloy SheathAir heating, radiant heating, cleaning and degreasing solutions, plating and pickling solutions, ...