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OPTIMUS U-31003 Cool Mist Ultrasonic Humidifier, 2-Gallon

3.6 out of 5 stars 49 customer reviews
| 16 answered questions

Price: $45.22 & FREE Shipping on orders over $49. Details
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  • Operates Up To 18 Hours
  • Water Empty Automatic Shut Off Switch and Refill Light
  • Adjustable Mist Volume Control
  • Easy-to-fill Transparent Water Tank
  • Whisper-quiet Operation
202 new from $45.22

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$45.22 & FREE Shipping on orders over $49. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

  • OPTIMUS U-31003 Cool Mist Ultrasonic Humidifier, 2-Gallon
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Total price: $56.87
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WARNING:
CHOKING HAZARD -- Small parts. Not for children under 3 yrs.

Product Description

Combat overly dry air with the Optimus 2-Gallon Cool Mist Ultrasonic Humidifier. This device operates quietly and humidifies a room continuously for up to 18 hours, with timer options of two-, eight- and twelve-hour intervals.

Product Information

Product Dimensions 14.7 x 10.8 x 7.6 inches
Item Weight 4.7 pounds
Shipping Weight 4.5 pounds (View shipping rates and policies)
Manufacturer OPTIMUS
ASIN B00C6UWJXS
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Item model number U-31003
Customer Reviews
3.6 out of 5 stars 49 customer reviews

3.6 out of 5 stars
Best Sellers Rank #630,539 in Home and Kitchen (See Top 100 in Home and Kitchen)
#429 in Home & Kitchen > Heating, Cooling & Air Quality > Humidifiers & Vaporizers > Single Room Humidifiers

Technical Specification

Warranty [pdf ]

Warranty & Support

Product Warranty: For warranty information about this product, please click here. [PDF ]

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This item: OPTIMUS U-31003 Cool Mist Ultrasonic Humidifier, 2-Gallon
Customer Rating 3 out of 5 stars (49) 4 out of 5 stars (496) 4 out of 5 stars (1464) 4 out of 5 stars (673)
Price $45.22 $39.00 $59.99 $29.05
Shipping FREE Shipping Prime Logo
Exclusively for Prime members
FREE Shipping FREE Shipping
Sold By Amazon.com Amazon.com Sunvalleytek Amazon.com
Color White Not Applicable white Black
Dimensions 7.6 inches x 14.7 inches x 10.8 inches 13.5 inches x 11.4 inches x 8.4 inches 11.81 inches x 8.07 inches x 5.31 inches 13 inches x 11 inches x 8.5 inches
Item Weight 4.65 pounds 24 pounds 3.24 pounds 4 pounds
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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

A Humidifier is a must have for the winter season on countries where you depende on the heater if you don't want to get that dry skin sensation and really want to be conformable at home. This $50 investment is one of the best you'll ever make to improve your lifestyle, and it can help you when you catch a cold either.

I always research and take my time before investing my money and the Optimus U31003 came as the best value. This unit it's great, good looking, silent, easy to refill and the 1.5 gallon tank lasts 24 hours on highest mist set up, so it can last even more on lower. We use it with some oil essence my wife got and the apartment smells very nice at all times (not sure if this will shorten the product life but is still worth it).

To get better results on small apartments, make sure you point the mist directly to the air return, that will make it flow through the entire unit and will make that 600 sp feet coverage even bigger.

I was kind of worried with the complains about the tank light but it isn't that noticeable even with all lights turned off and it actually gives it a better look.
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After purchasing the Vornado Evaporative Humidifier which worked well for a few days, until the wicks (the spongy filters) started to stink and began to grow mold, I knew I couldn't risk buying another filter-based unit.

I did my research, read reviews, visited countless sites, I decided on the Optimus Cool Mist Ultrasonic Humidifier. I was a little unhappy with Amazon seeing as I am a Prime member they sent it regular USPS but it was received in good condition.

The unit is essentially five pieces: 1. the tank, 2. the permanent filter/locking cap, 3. the base unit, 4. the spout, 5. cleaning tool (in base)

Many reviewers complained about the "irritating" blue light which is emitted but I guess "irritating" is relative. The glow is soothing and creates a warming environment. I also like the light because at night, I won't trip over it.

Although the operating instructions were written by someone with no understanding of the English language, you sort of need to ad-lib some words for the the sentences to make sense. They are not well-written.

So, I filled the chamber up with distilled water (recommended), screwed the cap (filter) and placed it back on the base. It *glugged* for a few seconds and I replaced the top (spout) which is not a design flaw, it is meant to be loose and movable.

Turned on the power and the unit instantaneously produces the mist. Press the Mist + to increase output and boy does it produce mist at high, a lot of mist. I ran the unit overnight and my humidistat registered a 9% increase in the relative humidity. This is very fast in my opinion.

The unit runs almost silent. The "motor" is so faint, its barely audible.
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This is a great humidifier that works well, has various settings so you can adjust how much mist it's putting out, easy to refill and clean. The only thing I don't like about this is an internal light within the humidifier that I can't figure out how to turn off, so it causes light in the room which I'd rather not have.
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This unit, on its highest setting lasts about 12 hours which is fine for me. It is quite effective if it is located close to where you sleep, in my case on my end table. I don't think if is very useful for a larger whole room. I have a humidistat about 18' from the unit and the reading has barely changed since I began using this humidifier, but using it next to the bed works well. I just fill it twice per day and leave it on. It is small and light weight and reasonably priced so I am satisfied. The mist has four output levels set by pushing the + or - buttons. I would like it better if I knew by an indicator what setting I am on. As it turns out I leave it on high all the time. The most annoying feature is the blue light inside the unit that stays on all of the time. I can find no way to turn it off and it casts far to much light in our bedroom. I covered it with black electrical tape but I think you should be able to turn it off. If not for this annoying light, and given my use of it which is to relieve dry nose at night, I would have rated it a 5.
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This version of the Optimus is not nearly as good as its slightly smaller relative of 1.5 gallon capacity. The capacity is misleading. The tank does not take 2 gallons. The capacity is once the tank is placed on the base and the base fills up then, there is likely more capacity. As the only way to fill the unit is via the tank - at best I maybe got 1.5 gallons out of it. The distinguishing feature between this and its better cousin is that this version has 2 clear sides and the front panel has a large clear portion. When on, a bright blue light shines through all of these transparent surfaces making it unusable in a bedroom if one is sensitive to light while attempting to sleep. The better cousin has only 1 transparent surface AND and option to turn off the light. The smaller unit is also much more silent when the mist level is cranked up. I had planned to have the larger unit in my bedroom but cannot use it there so it went into the office where it is of limited use to me.
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