No.
With a pelt, you'll need a cold plate, which would typically br 1/4" thick, and should help disperse the heat, right before it goes through the pelt itself. Once the heat hits the water block, the area should be much larger that the die.
How big it turns out though, I really don't know. I'd venture a guess at up to 1/2" extra, all around the original size of the die, at best.
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