Never really fully agreed with the environmental argument for tankless. Consider the concept of hearing your overall house as a balancing of heat sources and losses. Open the window or door and you lose heat, your furnace has to make up for it. If your tank loses heat, it loses that heat in to the interior of your house. As long as it is within the insulated portion of your house, that heat goes in to the overall heating equation. With a tankless, your furnace potentially fires more to make up for that missing heat source.
The argument in favour is really unlimited hot water supply, not overall energy savings. Unless you are in a hot climate using a decent amount of air conditioning.
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