I travel a lot, and it's very rare that I have something that doesn't work if I can figure out some way to physically jam it into the native power sockets. Same with naval power, where there is no neutral in a 115V outlet, only two hot legs, each 57V to ground.
I have had a few, though. Had a cell phone once where the 60Hz wall-wart worked to charge the phone but got awfully hot awfully quick at 50Hz, and was pretty clearly one appliance that can't do dual-frequencies.
My motivation for asking this question is that... A 3000W coffee pot kicks the pants off a 1500W coffee pot, and this seems like a fairly easy & low-impact retrofit where pulling in a new home-run is impractical.
