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Nope, don't remember anything about any "World's Most Efficient Water Heater."
I do know that you can find natural gas models of instant water heaters, that you are able to use them every day, and that you could mitigate the need for an acid wash with using softened water. Pricewise, they're now comparable in price with more traditional water heaters.
Natural gas versions of these things are used almost exclusively in Europe and Japan. Over there, they think it's supremely wasteful that we Americans always heat about 120 or more liters of water that we don't immediately use. Their hot water tanks, which are hard to find, tend to be placed on either a wall switch or a timer (Hm... that's an idea...)
It's a cultural issue as much as anything, I suppose.
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