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Like Glen I'm involved (heavily) with the threads in the DIY forum with cooling DSLRs. And I've built a ZWO ASI 120 MC camera cooling system.
The ZWO TEC system drew about 5-6 amps at 12 volts but it got down to almost -20* C. It caused some dew\ice issues which I also resolved but I moved onto the DSLR project instead mainly because of the better control software and cheaper bigger chips in DSLRs. 5-6 Volts only pulls an amp or so but the cooling effect is minimal at best.
Having just about sorted out a system for that I may revisit the ZWO project especially since ZWO Optical have now released cooled 2 stage cameras and software.
At high amps you do need a substantial heatsink. If you don't you do run the hot cold loop as detailed above. I'm using some thermopipe radiators off some old servers from work with a fan attached. At least I can keep my hands warm on a cold night in the Ob.
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