Why it matters
The Levoit Dual 100 Ultrasonic Top-Fill Cool Mist 2-in-1 Humidifier & Diffuser is an ultrasonic humidifier with a 1.8 L tank.
Run time per fill, per the maker: up to 20 hours.
Aim for 40 to 60 percent relative humidity indoors: drier air irritates airways and skin, wetter air feeds dust mites and mold. Use distilled or demineralized water to avoid the white mineral dust ultrasonic mist leaves behind.
A full tank holds about 1.8 liters, which adds roughly 4 pounds of water to carry or lift to the sink and back.
Spread over 20 hours, that tank works out to about 90 milliliters an hour, the rate on the setting the run time was measured at; higher settings empty it faster.
Its stated run time of 20 hours is one of the shortest run times we cover: 2 of the 69 humidifiers with a stated figure come in lower, and the range runs from 10 hours to 130 hours.
Price-wise it sat in the cheapest third of the 74 ultrasonic models we cover when we checked; the button shows today's price.
Compared with the Levoit Dual 200S Smart Top-Fill Ultrasonic Humidifier: tank 1.8 L here vs 3 liters; run time up to 20 hours here vs up to 25 hours.
Warranty, per the maker: 2 years.
Who it's for, and who should skip it
Good fit if
- Dry winter bedrooms
- Owners who will clean it weekly
Look elsewhere if
- Rooms far larger than its rating
Pros and cons
Pros
- 1.8 L tank
- Runs up to 20 hours per fill
Cons
- Needs regular cleaning to stay hygienic
- Ultrasonic mist leaves white dust with hard water
Limitations to weigh
- Not stated on the Levoit Dual 100 Ultrasonic Top-Fill Cool Mist 2-in-1 Humidifier & Diffuser listing: tank size, rated room size, noise level, power draw. Ask the seller or check the manual before relying on it.
Specifications
The bracket shows where each figure comes from.
| Price | $29.99 | Maker |
|---|---|---|
| Warranty | 2 years | Maker |
| Tank capacity | 1.8 L | Maker |
| Run time per fill | up to 20 hours | Maker |
Alternatives worth comparing
More room humidifiers we cover
- Dreo HM311S Humidifier
- Provirtec HC-12 Humidifier
- Levoit OasisMist 600S Smart Humidifier $109.99
- Vicks V745 Humidifier
- AIRCARE Horizon 4.7 Gal. Evaporative Whole House Console Humidifier $219.99
All room humidifiers, compared in one table · Every Levoit product we cover
Final verdict
A well-matched choice for dry winter bedrooms. Confirm the model it fits before ordering.
Where to buy
Each button opens this exact model. Disclosure