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Smartmi Evaporative Humidifier 2 Review

Our Overall Rating:
Humidification Performance
Ease of Cleaning
Noise Level
Build Quality

Learn how we test & rate here.


Filterless evaporator design with smart app control and a convenient top-fill option.


  • No need to pay for the filter replacement.

  • Easy to refill.

  • Easy to control.


  • It is a bit expensive.

  • Need to clean it regularly to prevent smells.

  • Some advanced features are not effective as it claims

  • It is not for large spaces.


130 ml/h (our test result)







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This evaporative humidifier packs advanced features like app control, self-cleaning, auto-drying, and top-fill design. While it manages to keep noise levels relatively low for an evaporative model, I did encounter some challenges when it came to cleaning the evaporator and fan. Additionally, I found that the self-cleaning and auto-drying features weren't as useful as expected. The output is moderate, and the price leans towards the higher side.

Why you can trust this review: I purchased this Smartmi Evaporative Humidifier 2 with our own money, took pictures, and spent two weeks testing it for its noise level, output, and humidification performance.

This is the second version of the Smartmi Evaporative humidifier, featuring added features such as an LED display, auto cleaning, and air drying. Intrigued by these unique additions in the realm of evaporative humidifiers, I decided to purchase it and put it to the test. Is it superior to traditional models? Let’s dive into my review together.

Smartmi Evaporative Humidifier 2 Ratings Breakdown

Humidification Performance 8?

Smartmi Evaporative Humidifier 2 output compare - 1

Based on my experience, I know that evaporative humidifiers typically aren’t as potent as ultrasonic and warm mist humidifiers of comparable water tank sizes.

So, when I received this machine, I anticipated an output of 160 to 200 ml/h. (Our indoor humidity level was around 42% during testing. As you know, the output of an evaporative humidifier is significantly impacted by the initial indoor humidity.)

For reference, another evaporative humidifier I tested, the Honeywell Cool Moisture Humidifier, achieved an output of 189 ml/h with a 3.8L water tank under similar conditions.

However, my 1-hour operation tests revealed an output of only 130 ml/h, which is relatively low compared to all the models I’ve tested. Given its price tag, I found this quite disappointing.

For comparison, the Canopy Bedside humidifier managed a 133 ml/h output with a 2.5L water tank.

According to our calculator, with 3 hours of continuous operation, it can effectively cover a room of 141 sq. ft. With 10 hours of continuous operation, it can extend its coverage to a room of 171 sq. ft., raising the humidity from 35% to 50%.

In summary, it’s suitable for small spaces. If you’re in need of a humidifier for a larger room, I wouldn’t recommend purchasing this one.

Ease Of Cleaning 8.5?

Smartmi Evaporative Humidifier 2 Review-ease of cleaning

Many people switch from ultrasonic humidifiers to evaporative ones in the hopes of reducing maintenance. This humidifier offers self-cleaning and auto-drying features, which seem promising for keeping the unit clean.

After two weeks of use, I didn’t notice any buildup or difficult-to-remove slime, but I still gave it a thorough cleaning. However, I found that the cleaning process took longer than with many other models I’ve tested.

The water tank is straightforward to clean since it’s essentially a large container with no internal components. However, the top and the evaporator (also known as the rotor) required more attention.

The evaporator consists of numerous chips that can accumulate buildup. While rinsing with running water was sufficient after two weeks of operation (especially since I used RO water), the cleaning process itself was time-consuming. I had to remove, clean, and reassemble each chip individually.

Another tricky area to clean is the fan part at the top, which is easy to overlook. I needed to use a test tube brush to remove the dust and dirt accumulated on the fan blades. Although it doesn’t accumulate quickly (typically every one or two months with daily use I estimate), it still adds to the maintenance workload.

So, while you save money on replacing wick filters, you’ll likely spend more time cleaning the unit thoroughly.

Noise Level 8.5?

ModeSound Level(dB)

This Smartmi evaporative humidifier operates quietly, especially compared to other evaporative models I have used.

While the high mode may be louder than ultrasonic humidifiers, it’s still relatively quiet among evaporative humidifiers.

For instance, the Honeywell cool moisture humidifier registers a noise level of 59.3 dB on high mode, whereas the smaller Canopy bedside humidifier reaches 65.6 dB.

Even with the high mode activated, I barely noticed the noise when the TV was on. Additionally, there’s no noticeable humming noise, making the overall sound more pleasant.

Furthermore, the low mode operates at only 36.9 dB, making it suitable for nighttime use in the bedroom without disturbing sleep.

Smartmi Evaporative Humidifier 2 noise level

Usability 9.3?

Smartmi Evaporative Humidifier 2 Review-usability

Setting up this product is a breeze since there are no small components to assemble.

There are two areas where I spent some time learning how to operate: the LED display and the Mi Home app.

The power button, located on one side of the display, also serves to adjust mist modes and activate the Wi-Fi feature with a 5-second press.

On the opposite side, there’s a button to adjust the brightness of the display. Holding this button for 3 seconds activates the cleaning mode. The good news, from my perspective, is that the display can be completely turned off, which is a feature that many light sleepers desire.

The auto drying mode can only be controlled through the Mi Home app, which fortunately has an intuitive interface.

However, I found the effectiveness of both the auto drying and self-cleaning modes to be minimal. The auto drying mode often takes too long, and the water tank may still not be completely dry afterward. If you prefer to bypass these features, that’s perfectly fine.

It’s important to note that you need to activate the auto drying mode when the water tank is still filled. You can’t turn it on after emptying the tank and expect it to dry immediately.

As for the built-in humidistat, adjusting it requires setting up an automation in the “My Scenes” section of the app. Since there are no instructions for this, it took me some time to figure it out.

Refilling the tank is straightforward: you can pour water directly from the top, and the display will show the water level change as you do so. However, I noticed that the water can sometimes collect on the blades of the air outlet.

Alternatively, you can remove the top and add water directly to the tank, using the max line on the tank wall as a guide. However, I found the top to be a bit heavy to lift.

Build Quality 10?

This humidifier is constructed with Acrylonitrile Butadiene Styrene, a type of plastic known for its safety and non-toxic properties. From my research, it seems to be a reliable choice.

Overall, the unit appears to be well-made. There are no rough edges, and each component, including the walls, blades, and evaporator, is crafted from thick materials. The display is clear, and the buttons are responsive, adding to its quality build.

Warranty 8.5?

This humidifier comes with a 1-year warranty, which is standard for many ultrasonic humidifiers.

However, compared to evaporative models, which often offer longer warranties, this may seem shorter.

For instance, Vornado typically provides a 5-year warranty, while Honeywell offers a 2-year warranty.

Design and Sizing

Smartmi Evaporative Humidifier 2 Review-design
Mist ModeLow, Medium, High, Auto
Size9.45 x 14.29 x 9.45 in
Tank Size4L
Weight9.48 lbs

The Smartmi Evaporative Humidifier 2 sports a regular cuboid design with a modest footprint, though it’s on the heavier side.

I advise you not to move it when it’s filled with water, as it can be quite heavy.

Available only in white, the unit features a sleek and modern aesthetic.

It consists of two main parts: the top and the tank.

The top section features a large air outlet, which also serves as the refill port. The fan, though not readily visible, is situated within the top part, accessible when the unit is inverted.

The air inlet is located at the back of the top part, housing the humidity sensor, while the display is positioned on the front.

Inside the water tank resides the evaporator, which rotates slowly when the machine is operational.

Overall, it’s a straightforward device in terms of design and functionality.


Price Range: $$$$$

While this humidifier comes with a hefty price tag upfront, it promises minimal ongoing expenses.

You won’t have to worry about frequent filter replacements or high energy bills, thanks to its low energy consumption and permanent evaporator.

However, despite its array of advanced features, its underwhelming humidification performance and the limited utility of some features makes me feel like I’ve paid a bit too much for what I get.

What Set This Smartmi Evaporativev 2 Humidifier Apart?

Permanent evaporator – no wick replacement needed

Smartmi Evaporative Humidifier 2 Review-evaporator

This Smartmi Evaporative Humidifier 2 comes with some promising features like self-cleaning and auto-drying. However, in my testing, I found that these features didn’t quite live up to expectations, so I won’t delve into them further here.

Let’s focus instead on the evaporator, which serves a similar purpose to the wick filter in traditional evaporative models.

When the unit is switched on, the evaporator rotates both horizontally and vertically, effectively expanding the evaporation area.

Made of plastic, it doesn’t absorb water like paper wick filters do. Instead, through rotation, water continuously adheres to the chip, attracting any buildup, dust, or dirt present in the water or from the surroundings.

I’ve noticed that the water tank of this model is more prone to contamination compared to others, likely due to its top-mounted air outlet and inlet, which make it easier for contaminants to enter.

The overall design resembles that of the Venta humidifiers, but with a single rotor, which may explain its relatively lower output.

By using this evaporator, you eliminate the need for wick replacements—a cost-saving benefit, considering that wicks can add up in price, especially with frequent use or when dealing with tap water.

However, it does require more time for cleaning, as the chips need to be removed and cleaned individually. Using RO or distilled water can help reduce cleaning frequency, although regular water replacement is still necessary.

It is app-controlled

Smartmi Evaporative Humidifier 2 Review-app control-1
Smartmi Evaporative Humidifier 2 Review-app control-2

These days, more and more models are compatible with Alexa and apps, but it’s more common to see this in ultrasonic humidifiers.

This evaporative humidifier can’t work with Alexa, but it can be controlled by its Mi Home app.

The app interface is very simple, displaying humidity and water level at the top. From there, I can turn on or off the cleaning mode, drying mode, and timer. I can also adjust the fan speed level and activate a child lock mode.

Currently, it offers two versions, which can be rotated for traditional style on the bottom.

I heard some users complain that it can’t set the target humidity level, which is weird. So I spent some time figuring out that it can be achieved by clicking “automation” and then “My scenes,” and setting an automation “when output humidity raises to a certain level, turn on or off this humidifier.”

Beyond that, it can send me a notification when the water level is low.

Other humidifiers to consider

When considering alternatives to this model, I assume you might be interested in other evaporative humidifiers.

So, I’ve chosen two models I’ve tested for your reference. One comes with a lower price tag, and offers better humidification performance, but fewer features. The other boasts an appealing aesthetic but has a smaller water tank.

For Cheaper Price

Honeywell HCM-350 Cool Moisture Humidifier

This humidifier is quite popular in the market. It's more affordable than the Smartmi Evaporative Humidifier 2 and offers a higher output. However, it's bulkier, lacks app control, and doesn't come with many extra features.

Read Full Review

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Honeywell HCM-350 Cool Moisture Humidifier review

For Smaller Size

Canopy Bedside Humidifier

This humidifier comes in a smaller size with a 2.5L water tank. It looks great and also includes an auto-drying feature, which is more effective than the feature in the Smartmi Evaporative Humidifier 2. Additionally, it has a diffusion feature.

Read Full Review

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Canopy Bedside Humidifier review

Who Should Buy This Humidifier? 

Smartmi Evaporative Humidifier 2

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Smartmi Evaporative Humidifiers review

This humidifier is a great option for those dealing with asthma or coughs, as it has a low likelihood of spreading bacteria in the air and is free of white dust.

If you’re someone who prefers using tap water in your humidifier, this is a good choice.

It’s also ideal for individuals who are tech-savvy or prefer easy control options.

However, it’s not the best choice for those on a budget or seeking a humidifier for large spaces. Additionally, if you’re someone who’s impatient or prefers low-maintenance appliances, this may not be the most suitable option.

If you have any questions about buying a humidifier, feel free to shoot me an email at [email protected] or leave a comment below!

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Liz Yang is the founder of Airsmartly. She has been working at home for a few years and realizes that the performance of the HVAC system plays such an important role in our life. She has tested more than 150 products in person, including humidifiers, air purifiers, dehumidifiers, and ACs, and wants to share tips about using or troubleshooting these products with you. Her uncle is an HVAC expert with over 30 years of experience in the field, and often offers assistance when she is unsure how to handle a situation. He is also in charge of reviewing the articles on this site.

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