First off 60w isn't going to cut it as the 6700k is a 91w cpu and it would require double that to cool it with a peltier
second a peltier for 24/7 use is a bad idea as the risk off it dying and killing hardware is very high
as for insulation the same things as ln2 should do
for info about cooling cpu's with a peltier check here and i've been planing to do a petlier setup myself but using one more so around around 400w
Edit: didn't notice Buildzoid's post but he is spot on although I've done ice water with just vas without a problem