Bionaire Ultrasonic Cool Warm Mist Humidifier BUL9100 CN Review

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Keeping the heater on can quickly over-dry your inside air, and this can trigger allergies, cause cracked and dry noses, and just general discomfort. 

For this reason, many people turn to humidifiers to restore the appropriate moisture level in the air. 

The Bionaire Ultrasonic Cool & Warm Mist Humidifier (BUL9100) does an excellent job of that.

With five pre-programmed settings, the BUL9100 makes it easy to customize your rooom’s humidity level to exactly what you need. 

Moreover, it offers both cool mist and warm mist options to handle any dry air situation. 

Pros and Cons



Unique Features

bionaire ultrasonic humidifier review

As a consumer, you will come across many options in the market when you step out to buy a humidifier – some even with specialized functions like catering for asthma patients or babies

This begs the question: Why should you invest your hard-earned money in the Bionaire Ultrasonic Cool Warm Mist Humidifier BUL9100 CN? 

Well, you should do so precisely because of the following features:

Dual Mist Option

One of the best features of the Bionaire Ultrasonic Cool Warm Mist Humidifier BUL9100 CN is that it has both warm and cool mist options. 

While both can be effective for humidifying the air, some people do prefer one over the other. This way, if you have children or pets around or the weather is hot, you can turn on the cool mist. However, in winters, the warm setting will be more appropriate.

Smart Controls

The machine has been manufactured to give you the recommended mode and also offers personalized settings. 

Five pre-programmed settings have the appropriate humidity and temperature levels for Allergy, Respiratory, Dry Skin, Cold/Flu, and Perfect Comfort. You can choose from them if you don’t want to disturb the factory settings.

However, if you want to tailor it according to your preference, you can operate it on manual settings.


Many customers are reluctant to buy a humidifier because they are scared of the risks posed by bacteria accumulation in these machines, and rightly so. 

However, the Bionaire Ultrasonic Cool Warm Mist Humidifier has been treated with antimicrobial properties. This assists prevention and protection against bacteria growth and doesn’t allow any nasty odors to settle either.

Tank Capacity

Another significant feature that most buyers look for in a humidifier is tank capacity, as it dictates the time for which the humidifier will be able to run correctly. The larger the tank capacity, the better the running time it will offer. 

This unit has a massive capacity of 0.78 gallons, which means a running time of 24 hours. If you have had some experience with humidifiers would know that this is pretty impressive for room humidifiers.

This unit has a massive capacity of 0.78 gallons, which means a running time of 24 hours. If you have had some experience with humidifiers would know that this is pretty impressive for room humidifiers

Comparing Bionaire BUL9100 CN with Bionaire BUL8000-UM

Albeit older, the Bionaire Ultrasonic Humidifier BUL8000-UM is another great member of the Ultrasonic Humidifiers from Bionaire. This section will compare the two to give you a better idea of what you might be looking for.

Both models’ controls are notable, but the Bionaire BUL9100 CN allows for better personalization and more pre-programmed settings. While the older model only has two settings, the BUL9100 CN has five factory settings for different preferences and needs.

Both of these are exceptional products, but the Bionaire BUL8000 UM does have an edge regarding capacity. It can hold one gallon while the Bionaire BUL9100 CN accommodates 0.78 gallon – not a stark difference. However, the latter still has a maximum run time of 24-hours, but that also depends on the speed.

Overall, both are excellent options, and customers have loved using both tremendously. They work efficiently and don’t have a lot of hassle involved. Since the Bionaire BUL9100 CN is a newer model, it has some extra features that make it stand out.

Issues & Concerns

bionaire ultrasonic humidifier review

We have always taken pride in being honest with our readers and educating them fully on any product we might promote. This review is no different, and apart from everything that we love, it’s only fair that we point out some points of concern.

Voltage Rating

This is not so much a drawback as a concern. Since the product has been manufactured primarily for North American or Canadian citizens, it is designed to operate on 110V. 

Therefore, if you live outside of North America, you need to take this factor into account and use a converter. It is important to note here that using a convertor will automatically make the warranty void.

Health Risks

The risk might be minimal but it is present. This product can expose users to certain kinds of chemicals that the State of California has recognized as substances that can cause cancer.

Care and Maintenance

We cannot stress enough the importance of proper unit maintenance for its correct functioning and longevity. 

Otherwise, you will eventually notice algae and bacteria build-up.

It’s best if you clean this unit every day it is in use. The process is simple – just unplug the machine, empty it of water, rinse the bin thoroughly, and refill with cold water again. 

For weekly cleaning, use a brush to reach all nooks and crannies to clean appropriately. 

Every once in a while, you should also disinfect your machine. For that, you’ll need to disassemble it and clean it with a vinegar solution. 

You can find more details of this in the owner’s manual.


This product comes with a one-year limited warranty covering manufacturing defects. The company will either replace it or repair it at their own cost.


Where to Buy

The Bionaire Ultrasonic Cool + Warm Mist Humidifier (BUL9100) is available for sale on Amazon and at Walmart.

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