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  • Optimus U-31002 1.5-Gallon Cool Mist Ultrasonic Humidifier
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Optimus U-31002 1.5-Gallon Cool Mist Ultrasonic Humidifier

by Optimus
| 39 answered questions

List Price: $113.48
Price: $42.99 & FREE Shipping. Details
You Save: $70.49 (62%)
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Ships from and sold by Amazon.com. Gift-wrap available.
  • 1.11 gallon tank capacity
  • Output of 1.5 gallons in 18 hours
  • Features a water empty automatic shut off switch and refill light
  • Adjustable mist volume control
  • Whisper-quiet operation; won't disturb sleep
71 new from $42.99 26 used from $19.86
$42.99 & FREE Shipping. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

Optimus U-31002 1.5-Gallon Cool Mist Ultrasonic Humidifier + AcuRite 00613A1 Indoor Humidity Monitor
Price for both: $52.97

Buy the selected items together

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  • Save Big On Open-Box & Used Products: Buy "Optimus U-31002 1.5-Gallon Cool Mist Ultrasonic Hu...” from Amazon Open-Box & Used and save 82% off the $113.48 list price. Product is eligible for Amazon's 30-day returns policy and Prime or FREE Shipping. See all offers from Amazon Open-Box & Used.

Product Description

This Optimus cool mist ultrasonic Humidifier has a 1.11 gallon tank capacity and outputs 1.5 gallons in 18 hours. It features a water empty automatic shut off switch and refill light and has an adjustable mist volume control. It contains a removable transparent tank with handle for easy removal and transprot and has a whisper-quiet operations so it won't disturb sleep.

Product Details

  • Product Dimensions: 11.4 x 8.4 x 13.5 inches
  • Shipping Weight: 4.3 pounds (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item can be shipped to select countries outside of the U.S. Learn More
  • Origin: China
  • Shipping Advisory: This item must be shipped separately from other items in your order. Additional shipping charges will not apply.
  • ASIN: B009CNHF68
  • Item model number: U-31002
  • Average Customer Review: 4.1 out of 5 stars  See all reviews (181 customer reviews)
  • Amazon Best Sellers Rank: #56,803 in Home & Kitchen (See Top 100 in Home & Kitchen)
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Customer Questions & Answers

Customer Reviews

4.1 out of 5 stars

Most Helpful Customer Reviews

139 of 146 people found the following review helpful By hklojay on March 18, 2014
Verified Purchase
I bought this unit to replace an expensive Air-o-Swiss that suddenly started leaking from the base after a year of use. This unit puts out a very admirable amount of moisture and is compact enough that it can easily fit on an end table to elevate it off the floor. Having tried several humidifiers at various price points, I would say this one strikes a good balance between price and function.

What I like: 1) It puts out a lot of vapor and has a solid feeling adjustment dial. 2) The night light is very bright but can easily be switched off. 3) The unit is compact and has a small footprint. 4) It stops operation when it runs out of water, which gives the user good piece of mind. 5) There are no wicks or filters to replace!

What I don't like: 1) The cleaning instructions that come with the unit are totally unhelpful. Having used other humidifiers in the past, I know to just soak the base in vinegar every other week to remove scum and deposits and use the little brush to clean the membrane that makes the vapor. However, the instructions do not detail anything of the sort. 2) To refill the unit, you remove the water tank from the base...there is often a lot of suction holding the base to the tank, which requires both hands to break. I always use a towel when doing this, as there is a lot of dripping on the floor. 3) My main complaint is that after reading the reviews before purchasing, I was surprised that the unit was not quite as quiet as promised. Keep in mind I was using a more expensive unit previously, so maybe I'm spoiled, but both the product description and most of the reviews promised a virtually silent operation. Um, no. It's not at all loud (like the cheap brands you can buy at Walgreens) but it's certainly not silent either.
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67 of 68 people found the following review helpful By dsmk on November 24, 2013
Verified Purchase
This humidifier is extremely quiet and doesn't disturb me at all as I am a very light sleeper. The tank has a slight glow in the dark and comes with a built in night light that's on/off optional. This lasts me three full nights before I have to refill it and I wake up feeling refreshed, highly recommend!
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50 of 53 people found the following review helpful By clearady on January 8, 2014
Verified Purchase
Whisper quiet. Doesn't take too much space. Easy to fill. Has something in the base of the water to keep mold from happening so you don't have to clean it (maybe not the most eco thing, but makes this low maintenance). Good price. Great for winter time since the indoor heat and outside dry cool air sucks the moisture from scalp and skin, causing dandruff, chapped lips, dry legs, and a less radiant complexion. This really helps counter all of that. It may also help some people breath easier and so sleep better.

As with most humidifiers, keep it on a nightstand, end table, or desk so that it doesn't dampen your carpet. Since the mist projects at an angle, it's not going to get your table wet. All humidifiers are meant to be kept on some surface.

A sensible purchase. Very pleased.
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47 of 51 people found the following review helpful By TW on September 30, 2014
Verified Purchase
(Update: 1/20/2015) The humidifier continues to be one of the best, if not best, performing humidifiers I've ever owned. There is one problem though. It's harder to clean than I realized. As someone who gets very annoyed with cleaning hindrances due to design, I'll go over those problems. The inside of the tank is a breeze to clean. A couple of tablespoons of white vinegar in a full tank of water, sitting for 15 minutes or so cleans it pretty well. There's an alternate method, though I don't know if it's recommended--drop a denture tablet in the tank with warm water in it. This really makes it white and sparkly again. I didn't invent the wheel there. I had just always used denture tablets to clean Camelbak water bottles that weren't dishwasher-friendly. The base that the tank sits down in is a whole other story. You would have to own this humidifier to understand what I'm talking about on this part. The plunger that releases water from the tank into the base is in a little tight area. You can get a Q-Tip down in there though, but even so, even with white vinegar, there are still parts down in there that won't come perfectly clean. You guessed it. Drop another denture tab down in there too. I don't have dentures, but my mom does and had several samples, including a crystallized version. Crystallized works well in the tank, but not in the base. Some of the little crystals were trying to get stuck in the little crevices. I ended up buying a value pack of the fresh mint tabs at the store with a Bullseye logo. They do a nice job of cleaning and making it look new. While reveling in my mastery of cleaning a humidifier, I noticed something, there's an entire tube in there that I've never cleaned. You can barely see it in the product image. It's the tube the vapor comes out of.Read more ›
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46 of 51 people found the following review helpful By midwestgirl on January 28, 2014
Verified Purchase
I'm very glad that I bought this humidifier. It's quiet, and easy to fill and clean, and puts out a LOT of mist instantly. I do want to add that it's important to use distilled water. If you use regular tap water, ultrasonic humidifiers tend to produce a fine white dust. It says to use distilled water in the manual, but it doesn't say why. It's the minerals in the tap water that cause the white dust.
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Optimus U-31002 1.5-Gallon Cool Mist Ultrasonic Humidifier
This item: Optimus U-31002 1.5-Gallon Cool Mist Ultrasonic Humidifier
Price: $42.99
Ships from and sold by Amazon.com