Wow thanks for all your help

**They are a solid multilayered electrical device - calling them "pads" is a bit.....They are not magical coolers they are merely heatpumps moving heat from one side of the TEC to the other.
Oww i like magic coolers

**When powered at rated voltage all TEC's in the right setup will go subambient whatever their size. You will have to give a 250w TEC more power to achieve the same cooling as a larger (400w say.) at lower power. It is the underpowering of a large unit that gets the stability allowing it to achieve a small rate of change in temperature.
So a 400w and undervolting it would be better than a 250w and overvolting because i can choose how much cooling power i would like to have

**You will HAVE to cool the hotside of the TEC - running a TEC without hotside cooling will cause it burn out.
Would it take a lot of cooling? Is it proportional to the cooling/heat transfer it does?


I send Uncle Jimbo a PM so if he does have time he might come along and help

If the TEC was powerful enough (within reason) would it be able to cool the coolant?
A Rad in free air will always heat up coolant that is at a lower temperature than the air the rad is in.
I did it that way so that if the water does drop to low it would warm it up, as i don't want condensation on my tubes, if i adjust fan speeds on the rads i should be able to find a perfect temp maybe?

Thank you

~Jiggy