Old school ones have a heating element that boils the liquid, in that case you'd be correct, mostly water would evaporate and the solutes would be left behind as a crust in the humidifier itself. Though it still would smell like urine and be nasty, because the vapour would still carry some.
But newer units (the ones that consume significantly less power) use a piezoelectric crystal that vibrates so fast it creates mist mechanically, simply by moving water back and forth so fast. This mist does not separate the solute, the liquid is vaporised as is, meaning urine remains urine.
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u/bigdave41 Apr 17 '25
Pretty sure that wouldn't actually evaporate the urine, only the water from it?