@ martin thanks for helping out on this project! The 62mm tec is the biggest size you will find that can be of any good to us. There are much bigger ones but they are also lower wattage. IMO I would make the hole thing to fit and cool 62mm tecs even if Naekuh only wants to use 50mm ones.

@NaeKuh it is great to finaly see you guys starting this project. like I told you before I think if you guys can make the fins inside a little higher to get better heat to water transfere.

I am not too sure I agree with nol on that statement. I think the 62w tecs will work ok but I would consider going with 80w tecs. or even bigger and under volt them.