Oooo, "noisy" is such a subjective thing? I haven't used an Iwaki, so I can't compare - I have three Panworld 100PXX's on my system. I can't hear them at all ... above the 15000 BTU AC, dehumidifier, etc. :P

Seriously, there is some noise, but really not much more than the muffin fans on my PC. I think the noise of your chiller & fuge gurgle will exceed the pump noise ... but like I said - soooooo subjective, esp. where you are sleeping.

You are more than welcome to come listen to mine, but it is a long drive. I would suggest plumbing it temporarily in/out of a tub and run it when the house is nice and quiet (does that ever happen at your place?).

Hey, how about installing a new 800 watt stereo system, just in case ;)

All kidding aside, I was SHOCKED how quiet this pump was.