Benjamin Dinkel wrote:the acid evaporates before the water. i think the boiling point is even lower then alcohol. So boiling it will actually result in having less acidity.
I think the principal acid in kombucha is acetic and
Wikipedia tells me the boiling point is 118-119 C. So it seems like gentle heating should drive water off faster than the acid, but I don't have the chemistry background to know if there's something that makes it more complicated than this.