I was told that some dehumidifiers DO use heat pipes. Try an HVAC place; they should have a source for them copycat.
If you look to industrial applications then you'll find that radiators and in fact all cooling devices are typically listed as "will cool x watts to y degrees". This is because the temp you'll see with the cooling depends on the heat load you are dealing with. So if you throw a 226W peltier into the loop, you will find that the existing rad/fan will no longer cool the water to ~5C above room temperature and instead the water temp is maybe 12C over room temp. Look at the deltaT max across your peltier, and then use maybe 12-15C over room temp as your hot side temp. That dictates to a large extent how cold the cold side will get.
How to get the water cooler? Bigger rad or bigger fans of course (or add less heat).
I dont think your gonna have a meltdown with a slow fan but you aren't gonna get the most out of your pelt investment.
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