Is it recommended practice to put a foam pad under an electric water heater? I plan on installing a new water heater (with a Uniform Energy Factor of 0.93) on a concrete floor in a garage. The installation manual states that an insulation blanket is not necessary, but says nothing about a pad under the heater. The heater will be in a plastic drain pan, so it will not be sitting directly on the concrete floor. Would the insulation provided by a pad make it worth installing, or are the newer electric water heaters well enough insulated that the pad would add no benefit? Thanks.