I also use two 172 watt peltiers. Rated for a maximum voltage of 24.6 volts. I bought them from Danger Den in the USA. I run the two 40mm x 40mm size peltiers in parallel on my waterblock and coldplate. Measuring the current they use when wired in parallel indicates around 17.1 amps, although I don't measure the current for more than 10 seconds or my multimeter is likely to be damaged. I would expect your peltiers to draw around 8.5 to 8.6 amps each if running them at the same voltage as me. I run my peltiers at around 19.1 volts DC. I use Meanwell 24 volt DC power supplies which have a small amount of voltage adjustment on them. For more info please see my website at..
http://www.e-magic.co.nz/starlet/
cheers
Keith