Why do you need distilled water for humidifiers if they’re turning the water into a vapor? Wouldn’t the minerals be left behind anyway?
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If you have owned a water cettle or a coffee maker you know what happens when you boil water and leave the minerals behind. The minerals form scale on the inside of the appliance and it can foul up the pipes and heaters to the point that it no longer works. Some humidifyers can be cleaned by running vinigar or a cleaning solution through it, but not all.
There are also other types of humidifyers which do not use heat to evaporate the water but instead do it mechanically. They use an ultrasonic element to throw the air molecules into the air in tiny dropplets that will evaporate in short term. These dropplets will carry with them any mineral that is in the water. So all the minerals end up in the air and cause issues.
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