Stainless steel is totally corrosion-free and heat resistant. Stainless steel is an eco-friendly raw material and that’s what makes it the best material for water storage tanks. But not all stainless steel water, storage tanks are ideal for you. You must select the water tank that is made of high-quality stainless steel like Purever uses Ferritic Austenitic stainless steel for making its Signature series of water tanks.