Levoit LV600S vs Vicks Warm Mist (2026): Which One?

Levoit states 6 L for the LV600S. Vicks states 1 gallon for the V745, which is roughly 3.79 L. That is about 58 percent more water in the Levoit, and in practical terms it is the difference between a machine you refill every second night and one you refill every night in a dry room.

Neither maker publishes a runtime figure or an output rate in our verified data, so capacity is the only honest proxy available, and it is an imperfect one: a machine that moves water faster empties a bigger tank sooner. What we can say is that if you find yourself refilling the V745 daily and resenting it, the LV600S will roughly halve that frequency, and the app scheduling will halve it again by not running the machine through an empty daytime bedroom.

The V745 heats water and cools the mist before release. The LV600S can do the same or run cool ultrasonic mist instead. That sounds like a comfort preference and it is also a safety decision.

The American Academy of Pediatrics prefers cool-mist humidifiers in children's rooms, because warm-mist and steam machines heat water and can scald if reached, tipped or pulled down by a cord. That rules the V745 out of a nursery entirely, since it has no cool mode. The LV600S is nursery-suitable only with the warm mode left off, which is a discipline rather than a design guarantee. The cleanest answer for a child's room is a cool-mist-only machine.

For adults, warm mist is genuinely pleasant in a cold bedroom and takes some of the chill off the air near the unit. It is not more effective at raising humidity, it does not treat a cold, and it should not be bought as though it does. If you want the full reasoning, read warm mist vs cool mist.

This is the clearest structural gap between the two. The LV600S has a built-in humidistat: it reads the room and works toward a humidity percentage you set. The V745 has two speeds and, in published figures, no humidistat at all, which means it runs at whatever speed you chose until the tank empties or you switch it off.

Why that matters: the commonly cited healthy indoor band is 30 to 50 percent relative humidity (EPA). Above roughly 60 percent you are creating conditions that mould and dust mites like, and a small sealed bedroom with a 1 gallon machine running on high all night can get there. With the V745, you are the humidistat, and the cheap fix is a $10 to $15 hygrometer on the far side of the room so at least you can see where you are.

Here is the one axis where money does not help the Levoit. The V745 has a medicine cup designed to hold Vicks VapoSteam, and the cup sits outside the water tank so the liquid never touches the working parts. VapoSteam is a medicated liquid with camphor at 6.2 percent, and it is formulated for steam vaporizers and warm-mist humidifiers with a medicine cup only.

It must never go into an ultrasonic tank, which is what the LV600S has. Nor should essential oils. Both attack the plastics and the ultrasonic diaphragm, and manufacturers generally exclude that damage from warranty coverage. There is no workaround and no accessory that fixes it: if scented warm mist is part of what you are buying, you are buying a Vicks. The rule is covered in full in can you put Vicks in a humidifier.

Worth being clear about what the scent is doing: menthol and camphor vapour is a comfort measure. It can make a stuffy nose feel more open. It does not treat a cold, shorten one or clear an infection, and none of these machines should be bought as though they will.

Both machines need the same daily habit and for slightly different reasons. Empty, rinse and dry the tank every morning rather than topping it up, and descale weekly with white vinegar. Water standing in a warm room grows biofilm within days, and neither design is immune.

The LV600S has one additional consideration: it is ultrasonic, so it aerosolizes whatever is in the tank. Clean water goes into the air; so does anything growing in it, and so do the minerals in hard tap water, which settle on nearby surfaces as fine white dust. Distilled water solves the dust and reduces descaling frequency. The V745 heats its water, which reduces what grows in the tank between cleanings but does not sterilize it, and does not remove the cleaning obligation.

Neither has a filter, so neither has a consumable beyond water, which is a genuine running-cost advantage over evaporative machines like the Honeywell HCM-350 class and the Canopy Bedside 2.0, both of which need filters. If you want the products worth putting in a tank, see the best humidifier cleaners, and for the routine itself, how to clean a vaporizer.

Somebody has a cold and you want relief tonight: the Vicks V745 at $39.49. Warm mist, a gallon of water, and a medicine cup for VapoSteam. Do not spend $109.00 on a machine you will use for two weeks.

Your house is dry for half the year: the Levoit LV600S at $109.00. Both mist types, a humidistat, scheduling, and a tank that does not need daily attention.

You want capacity and control but not warm mist: the Levoit 6 L smart cool mist at $69.98, with its published 60 hours and 26 dB. This is the value answer.

It is going in a child's room: cool mist only, so not the V745 at all, and the LV600S only with warm mode off. The cleanest choice is a cool-mist-only unit; the best humidifiers for a baby ranks that field, and the best warm-mist humidifiers covers the adult side.