That'd be an interesting idea, except (with my very limited understanding of heat pipes, keep in mind) I don't know how possible it would be. Even using a liquid with a much lower boiling point than water (say even as low as 60c), 60c is still a bit too toasty for running a good ol fashioned XPer (well, for my tastes anyway). So you'd have to put the large bottle, or lots of small bottles, under pressure, which in return would effect the whole setup.. I just can't think of a way for 1) clearflex/tygon to withstand the pressure needed to lower the boiling point for this to be useable, and 2) for the pump to withstand it/ pump the water around.
But I really don't know, this is just an educated guess. I think I'll shut up now
edit// by pressure I mean air pressure, so you'd also need a compressor or some really strong lungs.. ah yes, the shutting up, I recall now