Comment Re:now I never looked into it (Score 1) 420
The difficulty is not the ability to do it, it is that the energy requirements make it economically uncompetitive. Boiling that much water and then collecting the condensation generally takes a LOT of energy which is quite expensive in most cases.
It's worth noting that you can use the energy released by condensation to preheat water before it's boiled as well as use the temperature difference between just condensed water to preheat intake water. If you have high enough efficiency in your heat exchangers, you can significantly lower your energy requirements to boil water.