I'm not sure what kev did wrong in that article. There is a site in the ProCooling links section -
www.frostyfox.com (don't go there now, site is dead and you'll get popups from hell I just found out) of a guy that built a pelt-powered water-chiller, but using 6 pelts at 12V. With an additional 2 pelts right on the CPU he was running in the -60C range with no load if I remember correctly. In kev's article it looks like he did 2 experiements, one with 2 buckets of water, and one with his sink's - in the buckets of water experiment it appeared to work, and in the sinks it didn't. I think he likely made a mistake in one of them and didn't realize it at the time (eg. the chiller block had some air caught in it).
Either way - I'm not building a 2-loop water-chiller here. As I said above if you want to chill water phase-change is a much more efficient way to do it. I want to use a single water-cooling loop, and potentially make that single loop more efficient through the use of a pelt in a different position than I've seen before.