What to do to ensure warm water in the taps even without a geyser? Is that even possible? Yes, very much possible if you are aware of the 7-layer water tank technology of stainless steel water tanks. So, all you need to do is install a stainless steel water storage tank at your rooftop so that you get normal temperature even in freezing cold winter. Stainless steel is one of the preferred raw material recommended by construction, building and health experts who are of the opinion that plastic and PVC storage tanks are the main cause of water borne diseases in urban households.