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Dreo Smart Humidifier HM311S 4L Review | 43 Data compared

Avg. price:~£60Humidification rate:250 ml/hMaximum room area:27.87 m²Water tank capacity:4 LMaximum operating time:36 hoursMaximum noise level:32 dB

Dreo Smart Humidifier HM311S 4L Review: Compare 43 technical specifications and user reviews to see how this product ranks in the Humidifiers category and whether it is worth buying.

Dreo Smart Humidifier HM311S 4L
7.9/10

Overall score

Score
7.9/ 10
✕
What it is
An overall evaluation of products in the Humidifiers category, based on technical analysis and user reviews.
When it matters
When you need a quick reference for identifying the best products in the Humidifiers category.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 85% of models
Score components

80%

7.6

Technical score

20%

8.9

User score

â–²Better than 85% of humidifiers
8.2

Value for money

Value for money
8.2/ 10
✕
What it is
An indicator that combines the overall score of products in the Humidifiers category with their prices.
When it matters
When you are comparing products in the Humidifiers category and want a good balance between quality and price.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 83% of models
Score components

70%

7.9

Overall score

30%

9.0

Price

â–²Better than 83%
7.6

Technical score

Technical score
7.6/ 10
✕
What it is
An assessment of technical performance for products in the Humidifiers category across these key areas: Performance, Features, Design.
When it matters
When you want to compare products in the Humidifiers category by technical performance, specifications, and available features.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 79% of models
Score components

45%

7.2

Performance

40%

8.4

Features

15%

7.0

Design

â–²Better than 79%
8.9

User score

User score
8.9/ 10
✕
What it is
A rating that combines user reviews with the total review volume for products in the Humidifiers category.
When it matters
When you want to know how products in the Humidifiers category perform in everyday use and how reliable owners find them over time.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 87% of models
Score components

70%

8.8

User ratings

30%

9.0

Number of reviews

Based on ratings from across the web.
â–²Better than 87%
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Best prices
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Best rankings
Available: ranking among products currently available (including other versions of this product).All: ranking among all products in the database.
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Technical Specifications of humidifier Dreo Smart Humidifier HM311S 4L

Technical score
Technical score
7.6/ 10
✕
What it is
An assessment of technical performance for products in the Humidifiers category across these key areas: Performance, Features, Design.
When it matters
When you want to compare products in the Humidifiers category by technical performance, specifications, and available features.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 79% of models
Score components:

45%

7.2

Performance

40%

8.4

Features

15%

7.0

Design

7.6
User score
User score
8.9/ 10
✕
What it is
A rating that combines user reviews with the total review volume for products in the Humidifiers category.
When it matters
When you want to know how products in the Humidifiers category perform in everyday use and how reliable owners find them over time.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 87% of models
Score components

70%

8.8

User ratings

30%

9.0

Number of reviews

Based on ratings from across the web.
8.9
Popularity
Popularity
9.0/ 10
✕
What it is
An indicator based on the number of reviews received by products in the Humidifiers category.
When it matters
When you prefer products in the Humidifiers category that have been chosen and reviewed by many other buyers.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 85% of models
Popularity:
Dreo Smart Humidifier HM311S 4L has a popularity score of 9 points, which is higher than 84.6% of products in this category.
9.0
Value for money
Value for money
8.2/ 10
✕
What it is
An indicator that combines the overall score of products in the Humidifiers category with their prices.
When it matters
When you are comparing products in the Humidifiers category and want a good balance between quality and price.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 83% of models
Score components:

70%

7.9

Overall score

30%

9.0

Price

8.2
Technology
ultrasonic
Humidification rate
250 ml/h
Market range: <50 ml/h – >500 ml/h
This humidifier delivers a humidification rate of 250 ml/h, which is lower than that of 52.9% of humidifiers and equal to that of 4.3% of humidifiers.
Maximum room area
27.87 m²
Market range: <20 m² – >60 m²
This humidifier covers rooms up to 27.87 m², which is smaller than that of 68.3% of humidifiers and equal to that of 2.1% of humidifiers.
Water tank capacity
4 L
Market range: <0.4 L – >6.5 L
This humidifier has a water tank capacity of 4 L, which is larger than that of 57.7% of humidifiers and equal to that of 7.4% of humidifiers.
Maximum operating time
36 hours
Market range: <8 hours – >60 hours
This humidifier runs for up to 36 hours on a single fill, which is longer than 69.8% of humidifiers and equal to that of 4% of humidifiers.
Show more
Warm mist function
no
This humidifier does not offer a warm-mist option. A warm-mist option is present in 26.2% of humidifiers.
Aromatherapy support
yes
This humidifier supports aromatherapy. Aromatherapy support is available in 73.8% of humidifiers.
Dedicated aroma compartment
yes
This humidifier includes a dedicated aroma compartment. A dedicated aroma compartment is present in 48.3% of humidifiers.
Includes dedicated aroma hardware such as a tray, pad, drawer, or compartment.
Automatic low-water shut-off
yes
This humidifier shuts off automatically when water runs low. Automatic low-water shut-off is available in 99.3% of humidifiers.
Water level indicator
yes
This humidifier includes a water-level indicator. A water-level indicator is present in 83.9% of humidifiers.
Show more
Fill type
top fill
Color
white
Material
plastic
360° nozzle
no
This humidifier does not have a 360° nozzle. A 360° nozzle is included in 58.4% of humidifiers.
Display
yes
This humidifier has a display. A display is included in 43.6% of humidifiers.
Show more

Dreo Smart Humidifier HM311S 4L vs the average humidifier

246810TotalPerformanceFeaturesDesign
  • Wi-Fi control
    This humidifier supports Wi-Fi control; the average humidifier does not support Wi-Fi control.
  • Voice control supported
    This humidifier supports voice control; the average humidifier does not support voice control.
    Supports Amazon Alexa and Google Assistant.
  • Hygrostat included
    This humidifier has a hygrostat; the average humidifier has no hygrostat.
  • Dedicated aroma compartment
    This humidifier includes a dedicated aroma compartment; the average humidifier does not include a dedicated aroma compartment.
    Includes dedicated aroma hardware such as a tray, pad, drawer, or compartment.
  • 12 hours longer runtime
    This humidifier runs longer on a single fill than the average humidifier (36 hours vs 24 hours).
    36 hours vs 24 hours
  • 4.25 cm shallower body
    This humidifier has a shallower depth than the average humidifier (14 cm vs 18.25 cm).
    14 cm vs 18.25 cm
  • Display included
    This humidifier has a display; the average humidifier does not have a display.
  • 10 % RH lower target humidity
    This humidifier supports a lower target humidity setting than the average humidifier (30 % RH vs 40 % RH).
    30 % RH vs 40 % RH
  • 10.9% higher user score
    User score
    8.9/ 10
    ✕
    What it is
    A rating that combines user reviews with the total review volume for products in the Humidifiers category.
    When it matters
    When you want to know how products in the Humidifiers category perform in everyday use and how reliable owners find them over time.
    Score distribution
    â–¼
    â–¼
    <55-66-77-88-99-10
    Dreo Smart Humidifier HM311S 4L
    the average humidifier
    Dreo Smart Humidifier HM311S 4L has a higher user score than the average humidifier (8.87 vs 8.000).
    8.87 vs 8
  • 41.3% more popular
    Dreo Smart Humidifier HM311S 4L is more popular than the average humidifier (9.03 vs 6.4).
    9.03 vs 6.4
  • 8.5% better value for money
    Dreo Smart Humidifier HM311S 4L offers better value for money than the average humidifier (8.2 vs 7.6).
    8.2 vs 7.56
  • Hygrostat included
    This humidifier has a hygrostat; the average humidifier has no hygrostat.
  • 12 hours longer runtime
    This humidifier runs longer on a single fill than the average humidifier (36 hours vs 24 hours).
    36 hours vs 24 hours
  • 10 % RH lower target humidity
    This humidifier supports a lower target humidity setting than the average humidifier (30 % RH vs 40 % RH).
    30 % RH vs 40 % RH
  • 10 % RH higher target humidity
    This humidifier supports a higher target humidity setting than the average humidifier (90 % RH vs 80 % RH).
    90 % RH vs 80 % RH
  • 0.65 L larger water tank
    This humidifier has a larger water tank than the average humidifier (4 L vs 3.35 L).
    4 L vs 3.35 L
  • 1.1 dB lower maximum noise
    This humidifier is quieter at maximum output than the average humidifier (32 dB vs 33.1 dB).
    The specified operating range is 28–32 dB.
    32 dB vs 33.1 dB
  • Wi-Fi control
    This humidifier supports Wi-Fi control; the average humidifier does not support Wi-Fi control.
  • Voice control supported
    This humidifier supports voice control; the average humidifier does not support voice control.
    Supports Amazon Alexa and Google Assistant.
  • Dedicated aroma compartment
    This humidifier includes a dedicated aroma compartment; the average humidifier does not include a dedicated aroma compartment.
    Includes dedicated aroma hardware such as a tray, pad, drawer, or compartment.
  • 4.25 cm shallower body
    This humidifier has a shallower depth than the average humidifier (14 cm vs 18.25 cm).
    14 cm vs 18.25 cm
  • Display included
    This humidifier has a display; the average humidifier does not have a display.
  • 3.18 cm shorter body
    This humidifier has a lower profile than the average humidifier (25.8 cm vs 28.98 cm).
    25.8 cm vs 28.98 cm
  • 4.7% lighter
    This humidifier is lighter than the average humidifier (1.4 kg vs 1.48 kg).
    1.41 kg vs 1.48 kg
  • 8.45 cm wider body
    This humidifier has a wider body than the average humidifier (28 cm vs 19.6 cm).
    28 cm vs 19.555 cm
  • No 360° nozzle
    This humidifier does not have a 360° nozzle; the average humidifier has a 360° nozzle.
  • 3.13 m² less room coverage
    This humidifier covers smaller rooms than the average humidifier (27.9 m² vs 31 m²).
    27.87 m² vs 31 m²
  • 2 W higher power draw
    This humidifier draws more power than the average humidifier (26 W vs 24 W).
    26 W vs 24 W
  • 3.8% lower humidification rate
    This humidifier delivers a lower humidification rate than the average humidifier (250 ml/h vs 260 ml/h).
    250 ml/h vs 260 ml/h
  • 71.4% more expensive
    Dreo Smart Humidifier HM311S 4L is more expensive than the average humidifier (£60 vs £35).
    £60 vs £35
  • 71.4% more expensive
    Dreo Smart Humidifier HM311S 4L is more expensive than the average humidifier (£60 vs £35).
    £60 vs £35
  • 3.13 m² less room coverage
    This humidifier covers smaller rooms than the average humidifier (27.9 m² vs 31 m²).
    27.87 m² vs 31 m²
  • 2 W higher power draw
    This humidifier draws more power than the average humidifier (26 W vs 24 W).
    26 W vs 24 W
  • 3.8% lower humidification rate
    This humidifier delivers a lower humidification rate than the average humidifier (250 ml/h vs 260 ml/h).
    250 ml/h vs 260 ml/h
  • 8.45 cm wider body
    This humidifier has a wider body than the average humidifier (28 cm vs 19.6 cm).
    28 cm vs 19.555 cm
  • No 360° nozzle
    This humidifier does not have a 360° nozzle; the average humidifier has a 360° nozzle.

Video reviews

Hands-on testing, unboxing, and real-world video evaluations

Expert reviews

In-depth analysis and verdict from leading tech publications

C
cnet.com
23/02/2026
Summary of the review
Best Humidifiers to Keep Your Home Comfortable and Healthy
C
cnn.com
01/01/2026
Summary of the review
The best humidifiers of 2026, tried and tested
T
techgearlab.com
19/08/2025
Summary of the review
The Best Humidifiers | Lab Tested & Ranked
T
thespruce.com
06/01/2026
Summary of the review
The 11 Best Humidifiers The Spruce Has Tested
H
homeandsmart.de
06/12/2024
Summary of the review
Dreo Humidifier Review – Top Ultrasonic Model with App Control?
(Translated)Show original

Third-party reviews

Based on ratings from across the web.
Reviews last updated: August 2026 · How we calculate this

What we like about Dreo Smart Humidifier HM311S 4L

  • Quiet operation registering as low as 28dB
  • Generous 4-liter tank capacity requiring fewer refills
  • Convenient top-fill design reduces spills
  • Intuitive smart app and voice control integration
  • Powerful fine mist output that spreads evenly without wetting furniture
  • Useful ambient light that doubles as a nightlight and displays humidity status
  • Includes a dedicated essential oil pad for aromatherapy
  • Easy to clean due to its modular design and wide opening

What we don't like about Dreo Smart Humidifier HM311S 4L

  • Inaccurate built-in humidity readings affect Auto Mode accuracy
  • Certain functions like light customization and muting panel sounds require using the app
  • Using tap water can lead to calcium buildup and white dust residue
  • Mist nozzle direction is somewhat restricted by placement options
  • Some users report essential oils can degrade or melt the plastic tray over time
  • Requires ongoing maintenance to prevent rapid mold growth and odor buildup
  • Occasional reports of connectivity issues with voice assistants like Alexa
  • Hidden long-term costs due to paid replacement water filters

Verdict

The Dreo Smart Humidifier HM311S features a 4-litre top-fill tank and operates via a 26W ultrasonic dual-intake system, delivering cool mist through a 4-inch wide, 30° tiltable nozzle to cover up to 300 square feet. It includes a built-in precise humidity sensor, auto mode, an integrated essential oil aromapad tray, and a smart ambient LED light indicator. Key advantages include an ultra-quiet 28dB acoustic operation, a long runtime of up to 32 to 36 hours on its lowest setting, an easy-to-clean modular design, and robust smart connectivity via the Dreo app, Amazon Alexa, and Google Assistant. However, some users have reported drawbacks, including potential water leakage, a loose tank lid that does not lock in place, and a lack of a built-in carry handle for the water tank.

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