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Dreo Smart Humidifier HM306S 3L Review | 43 Data compared

Avg. price:~£45Humidification rate:250 ml/hMaximum room area:27.87 m²Water tank capacity:3 LMaximum operating time:30 hoursMaximum noise level:30 dB

Dreo Smart Humidifier HM306S 3L 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 HM306S 3L
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%

9.1

User score

â–²Better than 85% of humidifiers
8.3

Value for money

Value for money
8.3/ 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 85% of models
Score components

70%

7.9

Overall score

30%

9.4

Price

â–²Better than 85%
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 75% of models
Score components

45%

6.9

Performance

40%

8.4

Features

15%

7.4

Design

â–²Better than 75%
9.1

User score

User score
9.1/ 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
★ Better than 91% of models
Score components

70%

8.8

User ratings

30%

9.7

Number of reviews

Based on ratings from across the web.
★Better than 91%
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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 HM306S 3L

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 75% of models
Score components:

45%

6.9

Performance

40%

8.4

Features

15%

7.4

Design

7.6
User score
User score
9.1/ 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
★ Better than 91% of models
Score components

70%

8.8

User ratings

30%

9.7

Number of reviews

Based on ratings from across the web.
9.1
Popularity
Popularity
9.7/ 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 89% of models
Popularity:
Dreo Smart Humidifier HM306S 3L has a popularity score of 9.7 points, which is higher than 88.6% of products in this category.
9.7
Value for money
Value for money
8.3/ 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 85% of models
Score components:

70%

7.9

Overall score

30%

9.4

Price

8.3
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
3 L
Market range: <0.4 L – >6.5 L
This humidifier has a water tank capacity of 3 L, which is smaller than that of 51% of humidifiers and equal to that of 8.1% of humidifiers.
Maximum operating time
30 hours
Market range: <8 hours – >60 hours
This humidifier runs for up to 30 hours on a single fill, which is longer than 61.1% of humidifiers and equal to that of 4.7% 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
yes
This humidifier has a 360° nozzle. A 360° nozzle is included in 57.7% of humidifiers.
Display
yes
This humidifier has a display. A display is included in 43.6% of humidifiers.
Show more

Dreo Smart Humidifier HM306S 3L 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.
  • 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.
  • 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 % 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
  • 3.1 dB lower maximum noise
    This humidifier is quieter at maximum output than the average humidifier (30 dB vs 33.1 dB).
    30 dB vs 33.1 dB
  • 13.4% higher user score
    User score
    9.1/ 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 HM306S 3L
    the average humidifier
    Dreo Smart Humidifier HM306S 3L has a higher user score than the average humidifier (9.07 vs 8.000).
    9.07 vs 8
  • 51.7% more popular
    Dreo Smart Humidifier HM306S 3L is more popular than the average humidifier (9.7 vs 6.4).
    9.7 vs 6.4
  • 10% better value for money
    Dreo Smart Humidifier HM306S 3L offers better value for money than the average humidifier (8.31 vs 7.6).
    8.31 vs 7.56
  • Hygrostat included
    This humidifier has a hygrostat; the average humidifier has no hygrostat.
  • 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
  • 3.1 dB lower maximum noise
    This humidifier is quieter at maximum output than the average humidifier (30 dB vs 33.1 dB).
    30 dB vs 33.1 dB
  • 6 hours longer runtime
    This humidifier runs longer on a single fill than the average humidifier (30 hours vs 24 hours).
    30 hours vs 24 hours
  • 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.
  • 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.
  • Display included
    This humidifier has a display; the average humidifier does not have a display.
  • 9.68 cm shorter body
    This humidifier has a lower profile than the average humidifier (19.3 cm vs 28.98 cm).
    19.3 cm vs 28.98 cm
  • 16.9% lighter
    This humidifier is lighter than the average humidifier (1.2 kg vs 1.48 kg).
    1.23 kg vs 1.48 kg
  • 0.01 m longer power cable
    This humidifier has a longer power cable than the average humidifier (1.5 m vs 1.51 m).
    1.52 m vs 1.51 m
  • 6.35 cm wider body
    This humidifier has a wider body than the average humidifier (25.9 cm vs 19.6 cm).
    25.9 cm vs 19.555 cm
  • 5 W higher power draw
    This humidifier draws more power than the average humidifier (29 W vs 24 W).
    29 W vs 24 W
  • 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
  • 0.35 L smaller water tank
    This humidifier has a smaller water tank than the average humidifier (3 L vs 3.35 L).
    3 L vs 3.35 L
  • 1.05 cm deeper body
    This humidifier has a deeper profile than the average humidifier (19.3 cm vs 18.25 cm).
    19.3 cm vs 18.25 cm
  • 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
  • 28.6% more expensive
    Dreo Smart Humidifier HM306S 3L is more expensive than the average humidifier (£45 vs £35).
    £45 vs £35
  • 28.6% more expensive
    Dreo Smart Humidifier HM306S 3L is more expensive than the average humidifier (£45 vs £35).
    £45 vs £35
  • 5 W higher power draw
    This humidifier draws more power than the average humidifier (29 W vs 24 W).
    29 W vs 24 W
  • 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
  • 0.35 L smaller water tank
    This humidifier has a smaller water tank than the average humidifier (3 L vs 3.35 L).
    3 L vs 3.35 L
  • 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
  • 6.35 cm wider body
    This humidifier has a wider body than the average humidifier (25.9 cm vs 19.6 cm).
    25.9 cm vs 19.555 cm
  • 1.05 cm deeper body
    This humidifier has a deeper profile than the average humidifier (19.3 cm vs 18.25 cm).
    19.3 cm vs 18.25 cm

Video reviews

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

Expert reviews

In-depth analysis and verdict from leading tech publications

B
bobvila.com
28/08/2025
Summary of the review
Dreo Smart Humidifier Review - Tested by Bob Vila
C
consumerreports.org
N/A
Summary of the review
Dreo HM306S Humidifier Review - Consumer Reports
E
etm-testmagazin.de
23/01/2026
Summary of the review
Dreo Humidifier 306 Review 2026
(Translated)Show original
H
haus-garten-test.de
01/09/2025
Summary of the review
DREO 306 Humidifier Review - House & Garden Test
(Translated)Show original
H
homeandsmart.de
06/12/2024
Summary of the review
Dreo Humidifier Review – Top Ultrasonic Models
(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 HM306S 3L

  • Whisper-quiet operation at only 26 dB in sleep mode, making it ideal for bedrooms
  • Convenient top-fill design allows easy refilling without flipping the water tank or spilling
  • Ultrafine ultrasonic mist evenly covers up to 300 square feet without dampening surrounding furniture
  • Excellent smart features including accurate room humidity tracking, custom targets, and seamless remote control via the app
  • Long continuous runtime of up to 30 hours on a single fill
  • Includes a dedicated aroma tray for essential oils and a built-in customizable ambient night light
  • The 360-degree rotating nozzle offers great flexibility in directing the mist output

What we don't like about Dreo Smart Humidifier HM306S 3L

  • Lacks internal Wi-Fi memory, requiring the device to re-sync with the app whenever it is unplugged and moved to a different room
  • The 3-liter water capacity is relatively small and may require more frequent refills compared to larger 4L or 6L models
  • Requires regular, diligent maintenance every few days to prevent mold and mineral buildup
  • The integrated humidity sensor can occasionally display unreliable or inconsistent readings compared to dedicated external sensors

Verdict

The Dreo Smart Humidifier HM306S is a 3-liter ultrasonic cool mist device designed for spaces up to 300 square feet, featuring a 2.4MHz high-frequency atomizer that releases a 5μm ultra-fine mist up to 40 inches high at a rate of 250ml/hr. Key advantages include an extensive 30-hour maximum runtime, ultra-quiet 26dB operation in sleep mode, a convenient top-fill design, an aroma pad tray for essential oils, customizable RGB ambient lighting, and intelligent auto-adjustments via a precision humidistat and app or voice control. However, notable drawbacks include a lack of built-in Wi-Fi memory that forces the unit to re-sync with the app when moved between rooms, and it does not offer a warm mist option.

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