@Mark011 what's the noise like from the pump at idle? I've found in the past pump noise to be quiet irritating when doing desktop stuff / no load. You can run fans pretty slow to produce next to no noise but AIOs seem to constantly put out a noise.
@LiE I realise a few months have gone by since your message but, with reference to the loudness of the NZXT h1 pump fan in case anyone else is interested. . Yes it is a loud whine (in a silent room) as the post below your initial one said, because it's running full speed all the time. Fine for gaming however general pc work it is a bit of a 'small hill to die on' for those of sensitive hearing! (and it'll wear the pump out quicker surely).
However, there is a solution. In my MSI mobo bios I set the Pump fan to "DC", this then allowed me to set a custom fan profile (in the bios) and lo and behold I now have a silent pc! Massive difference for me.
I set it to come on at 30deg c, stay constant (1800rpm ish) until 50deg when it then shoot up to the max from there to 80degrees (stays at max from there). [I don't claim that this is the 'best' or 'safest' way to do it, there may be better/more appropriate temps and i'm happy to hear opinions].
2200rpm is about the speed when it begins to be heard for me, so anything below that is 'silent'.
Note the reason i set it to stay on permanently is that it was flicking/clicking (noise) on and off at around 30degrees which was a bit annoying, (due to the angle of the fan profile line between the first and second reference points). It seems to need 3.86 volts in order to come on and this is about 1800 rpm, which is silent, i just set it to that until 50deg when it ramps up as described above.
I *was* considering swapping it out for air cooled but I now love the case!