I am looking to change my hot water tank and am exploring the many options available. I have heard of a method were you would install a water storage tank for incoming water and then water from that tank would supply the hot water tank. This would allow the water to rise to room temperature in the storage tank before being heated rather than heat much colder water directly from the main. A storage tank is not that expensive however would still only like to install it if there is an energy savings involved. Any idea if this makes any sense?