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SMARTDEVIL H2O Humidifier 2.02.01.0019 Review | 43 Data compared

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  • Avg. price in UK: ~£20
  • Avg. price in US: ~$20
  • Humidification rate: 50 ml/h
  • Maximum room area: ?
  • Water tank capacity: 0.5 L
  • Maximum operating time: 18 hours
  • Maximum noise level: 30 dB

SMARTDEVIL H2O Humidifier 2.02.01.0019 review. Compare 43 technical specifications and user reviews to see how this product ranks in the Humidifiers category and whether it is worth buying.

5.8

Overall score

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 components:

80.0%

5.1

Technical Score

20.0%

8.6

User score

Good
5.1

Technical Score

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 components:

45.0%

3.5

Performance

40.0%

5.8

Features

15.0%

7.7

Design

Good
8.6

User score

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 components:

70.0%

8.0

User reviews

30.0%

10

Popularity

User score:
United Kingdom
amazon
4.0
(2990)
amazon
3.9
(1008)
amazon
3.9
(271)
amazon
3.4
(227)
United States
Amazon_logo.png
4.1
(3118)
Amazon_logo.png
3.9
(226)

(Reviews last updated: August 2026)

Excellent
  • 6.6
    Bedroom use

    Score components:

    35.0%

    8.5

    Maximum noise level

    25.0%

    3.4

    Maximum operating time

    20.0%

    4.0

    Timer

    20.0%

    10

    Automatic low-water shut-off

  • 3.5
    Large rooms

    Score components:

    35.0%

    1.0

    Humidification rate

    30.0%

    ?

    Maximum room area

    25.0%

    1.3

    Water tank capacity

    10.0%

    4.0

    Hygrostat

  • 2.6
    Plant care

    Score components:

    30.0%

    4.0

    Hygrostat

    25.0%

    1.0

    Humidification rate

    25.0%

    1.3

    Water tank capacity

    20.0%

    4.0

    360° nozzle

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Best prices in UK

Best rankings

?

Available: ranking among products currently available (including other versions of this product).
All: ranking among all products in the database.

Verdict

The SMARTDEVIL H2O Humidifier is a portable, ultrasonic cool-mist desktop unit featuring a 500ml water tank capacity, a 5V DC micro-USB power input, and a power consumption of 2W max. Operating via a one-touch button control, it provides a spray volume of 30-60mL/H across two distinct modes, delivering up to 12 hours of runtime on continuous mist and 18 hours on intermittent mist. Key pros include a whisper-quiet noise level of under 26-28dB, an integrated warm LED nightlight with both constant and breathing modes, a built-in safety probe for waterless automatic shut-off, and an automatic 8-hour operation timer. However, notable cons include its strict requirement for corded power since it does not contain a built-in battery, the restriction against using distilled or pure water to prevent outlet clogging, and a manufacturing warning against adding essential oils directly into the water tank to avoid damaging the internal filter cotton swab.

Technical Specifications of humidifier SMARTDEVIL H2O Humidifier 2.02.01.0019

Technical Score

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 components:

45.0%

3.5

Performance

40.0%

5.8

Features

15.0%

7.7

Design

5.1
SMARTDEVIL H2O Humidifier 2.02.01.0019 has a technical score of 5.06 points, which is lower than 95.3% of products in this category.
User score

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 components:

70.0%

8.0

User reviews

30.0%

10

Popularity

User score:
United Kingdom
amazon
4.0
(2990)
amazon
3.9
(1008)
amazon
3.9
(271)
amazon
3.4
(227)
United States
Amazon_logo.png
4.1
(3118)
Amazon_logo.png
3.9
(226)

(Reviews last updated: August 2026)

8.6
SMARTDEVIL H2O Humidifier 2.02.01.0019 has a user score of 8.61 points, which is higher than 69.8% of products in this category.
Popularity
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.
10
SMARTDEVIL H2O Humidifier 2.02.01.0019 has a popularity of 10 points, which is higher than 67.8% of products in this category.
Ratio quality/price

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 components:

60.0%

5.8

Overall score

40.0%

10

Price

7.0
SMARTDEVIL H2O Humidifier 2.02.01.0019 has a quality-to-price ratio of 7 points, which is lower than 77.2% of products in this category.
Technology
What it is: The method the humidifier uses to turn water into moisture for the room.
When it matters: Technology affects mist temperature, visible output, maintenance needs, and sensitivity to minerals in the water.

Importance: LOW

evaporative
Humidification rate
What it is: The maximum amount of water the humidifier can release into the air per hour.
When it matters: A higher rate raises room humidity faster and is more useful in dry or larger spaces.

Importance: HIGH

Good value: At least 300 ml/h

50 ml/h
SMARTDEVIL H2O Humidifier 2.02.01.0019 delivers a humidification rate of 50 ml/h, which is lower than that of 82.9% of humidifiers and equal to that of 12.1% of humidifiers.
Maximum room area
What it is: The largest room floor area the humidifier is recommended to cover.
When it matters: A larger coverage rating is important for open-plan spaces and larger bedrooms or living rooms.

Importance: HIGH

Good value: At least 40 m²

?
Water tank capacity
What it is: The usable amount of water the humidifier’s reservoir can hold.
When it matters: A larger tank generally needs fewer refills and can support longer operation between top-ups.

Importance: HIGH

Good value: At least 4 L

0.5 L
SMARTDEVIL H2O Humidifier 2.02.01.0019 has a water tank capacity of 0.5 L, which is smaller than that of 81.2% of humidifiers and equal to that of 6.7% of humidifiers.
Maximum operating time
What it is: The longest stated operating time from one full water tank.
When it matters: Longer runtime means fewer refills during overnight use or extended daily operation.

Importance: HIGH

Good value: At least 24 hours

18 hours
SMARTDEVIL H2O Humidifier 2.02.01.0019 runs for up to 18 hours on a single fill, which is shorter than 61.7% of humidifiers and equal to that of 3.4% of humidifiers.
Show more
Warm mist function
What it is: Indicates whether the humidifier can produce warm mist as well as cool mist.
When it matters: Useful when you want warmer output in cool weather instead of cool mist alone.

Importance: HIGH

Good value: yes

no
SMARTDEVIL H2O Humidifier 2.02.01.0019 does not offer a warm-mist option. A warm-mist option is present in 26.2% of humidifiers.
Aromatherapy support
What it is: Indicates whether the humidifier supports the safe use of aromatic oils or fragrance media.
When it matters: Useful if you want to add fragrance without putting oil directly into the water tank.

Importance: MEDIUM

Good value: yes

no
SMARTDEVIL H2O Humidifier 2.02.01.0019 does not support aromatherapy. Aromatherapy support is available in 74.5% of humidifiers.
Dedicated aroma compartment
What it is: Indicates whether the humidifier has a separate compartment for aroma pads or essential oils.
When it matters: A dedicated compartment keeps fragrance media separate from the main water tank.

Importance: LOW

Good value: yes

no
SMARTDEVIL H2O Humidifier 2.02.01.0019 does not include a dedicated aroma compartment. A dedicated aroma compartment is present in 49% of humidifiers.
Automatic low-water shut-off
What it is: Indicates whether the humidifier switches itself off when the water level becomes too low.
When it matters: This safety feature helps prevent the unit from continuing to run with an empty tank.

Importance: HIGH

Good value: yes

yes
SMARTDEVIL H2O Humidifier 2.02.01.0019 shuts off automatically when water runs low. Automatic low-water shut-off is available in 99.3% of humidifiers.
Water level indicator
What it is: Indicates whether the humidifier shows the amount of water remaining in its tank.
When it matters: A visible level indicator makes it easier to know when the tank needs refilling.

Importance: MEDIUM

Good value: yes

yes
SMARTDEVIL H2O Humidifier 2.02.01.0019 includes a water-level indicator. A water-level indicator is present in 83.9% of humidifiers.
Show more
Fill type
What it is: The design mechanism used to add water to the humidifier tank, distinguished primarily between convenient top-fill and inverted bottom-fill designs.
When it matters: Top-fill humidifiers let you pour water directly into the top with a pitcher without carrying a heavy, dripping tank to the tap.

Importance: LOW

top fill
Color
What it is: The primary exterior color of the humidifier.
When it matters: Color matters when you want the humidifier to blend with the room.

Importance: LOW

grey
Material
What it is: The primary material used for the humidifier’s exterior housing.
When it matters: Material matters for durability, feel and appearance.

Importance: LOW

plastic
360° nozzle
What it is: Whether the humidifier has a nozzle that rotates through 360° to direct the mist.
When it matters: A rotating nozzle helps redirect mist without moving the humidifier.

Importance: LOW

Good value: yes

no
SMARTDEVIL H2O Humidifier 2.02.01.0019 does not have a 360° nozzle. A 360° nozzle is included in 58.4% of humidifiers.
Display
What it is: Whether the humidifier has a display for settings and status information.
When it matters: A display makes humidity, mode and timer information easier to check.

Importance: LOW

Good value: yes

no
SMARTDEVIL H2O Humidifier 2.02.01.0019 does not have a display. A display is included in 44.3% of humidifiers.
Show more

SMARTDEVIL H2O Humidifier 2.02.01.0019 vs the average humidifier

  • 84.5% lighter
    SMARTDEVIL H2O Humidifier 2.02.01.0019 is lighter than the average humidifier (0.2 kg vs 1.48 kg).
    What it is: The humidifier’s weight without packaging.
    When it matters: A lighter humidifier is easier to move for refilling, cleaning or storage.

    Importance: MEDIUM

    Good value: Up to 1.5 kg

    SMARTDEVIL H2O Humidifier 2.02.01.0019 is lighter than the average humidifier (0.2 kg vs 1.48 kg).0.23 kg vs 1.48 kg
  • 10.06 cm narrower body
    SMARTDEVIL H2O Humidifier 2.02.01.0019 has a narrower body than the average humidifier (9.5 cm vs 19.555 cm).
    What it is: The humidifier’s side-to-side width.
    When it matters: A narrower humidifier takes up less space on a bedside table, desk or shelf.

    Importance: MEDIUM

    Good value: Up to 20 cm

    SMARTDEVIL H2O Humidifier 2.02.01.0019 has a narrower body than the average humidifier (9.5 cm vs 19.555 cm).9.5 cm vs 19.555 cm
  • 8.75 cm shallower body
    SMARTDEVIL H2O Humidifier 2.02.01.0019 has a shallower depth than the average humidifier (9.5 cm vs 18.25 cm).
    What it is: The humidifier’s front-to-back depth.
    When it matters: A shallower humidifier needs less usable surface depth on a table or shelf.

    Importance: MEDIUM

    Good value: Up to 20 cm

    SMARTDEVIL H2O Humidifier 2.02.01.0019 has a shallower depth than the average humidifier (9.5 cm vs 18.25 cm).9.5 cm vs 18.25 cm
  • 19 W lower power draw
    SMARTDEVIL H2O Humidifier 2.02.01.0019 draws less power than the average humidifier (5 W vs 24 W).
    What it is: The humidifier’s maximum rated electrical power draw.
    When it matters: Lower power draw can reduce electricity use, especially when the humidifier runs for many hours each day.

    Importance: MEDIUM

    Good value: Up to 25 W

    SMARTDEVIL H2O Humidifier 2.02.01.0019 draws less power than the average humidifier (5 W vs 24 W).5 W vs 24 W
  • 16.08 cm shorter body
    SMARTDEVIL H2O Humidifier 2.02.01.0019 has a lower profile than the average humidifier (12.9 cm vs 28.98 cm).
    What it is: The humidifier’s total height from its base to its highest point.
    When it matters: A shorter humidifier fits more easily beneath shelves and in low spaces.

    Importance: LOW

    Good value: Up to 25 cm

    SMARTDEVIL H2O Humidifier 2.02.01.0019 has a lower profile than the average humidifier (12.9 cm vs 28.98 cm).12.9 cm vs 28.98 cm
  • 3.1 dB lower maximum noise
    SMARTDEVIL H2O Humidifier 2.02.01.0019 is quieter at maximum output than the average humidifier (30 dB vs 33.1 dB).
    What it is: The highest stated operating sound level across normal humidification modes.
    When it matters: A lower maximum noise level is better for bedrooms, nurseries, calls, and light sleepers.

    Importance: HIGH

    Good value: Up to 35 dB

    SMARTDEVIL H2O Humidifier 2.02.01.0019 is quieter at maximum output than the average humidifier (30 dB vs 33.1 dB).30 dB vs 33.1 dB
  • 75% cheaper
    SMARTDEVIL H2O Humidifier 2.02.01.0019 is cheaper than the average humidifier (£20 vs £35).
    SMARTDEVIL H2O Humidifier 2.02.01.0019 is cheaper than the average humidifier (£20 vs £35).£20 vs £35
  • 80.7% more popular
    SMARTDEVIL H2O Humidifier 2.02.01.0019 is more popular than the average humidifier (10 vs 5.535).
    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.
    SMARTDEVIL H2O Humidifier 2.02.01.0019 is more popular than the average humidifier (10 vs 5.535).10 vs 5.54
  • 19 W lower power draw
    SMARTDEVIL H2O Humidifier 2.02.01.0019 draws less power than the average humidifier (5 W vs 24 W).
  • 3.1 dB lower maximum noise
    SMARTDEVIL H2O Humidifier 2.02.01.0019 is quieter at maximum output than the average humidifier (30 dB vs 33.1 dB).
  • 84.5% lighter
    SMARTDEVIL H2O Humidifier 2.02.01.0019 is lighter than the average humidifier (0.2 kg vs 1.48 kg).
  • 10.06 cm narrower body
    SMARTDEVIL H2O Humidifier 2.02.01.0019 has a narrower body than the average humidifier (9.5 cm vs 19.555 cm).
  • 8.75 cm shallower body
    SMARTDEVIL H2O Humidifier 2.02.01.0019 has a shallower depth than the average humidifier (9.5 cm vs 18.25 cm).
  • 16.08 cm shorter body
    SMARTDEVIL H2O Humidifier 2.02.01.0019 has a lower profile than the average humidifier (12.9 cm vs 28.98 cm).

Total
Overall
Performance
Design
  • 80.8% lower humidification rate
    SMARTDEVIL H2O Humidifier 2.02.01.0019 delivers a lower humidification rate than the average humidifier (50 ml/h vs 260 ml/h).
  • 2.85 L smaller water tank
    SMARTDEVIL H2O Humidifier 2.02.01.0019 has a smaller water tank than the average humidifier (0.5 L vs 3.35 L).
  • 2 levels less mist control
    SMARTDEVIL H2O Humidifier 2.02.01.0019 offers fewer mist adjustment levels than the average humidifier (1 levels vs 3 levels).
  • 6 hours shorter runtime
    SMARTDEVIL H2O Humidifier 2.02.01.0019 runs for a shorter time than the average humidifier (18 hours vs 24 hours).
  • No timer
    SMARTDEVIL H2O Humidifier 2.02.01.0019 does not include a programmable timer; the average humidifier includes a programmable timer.
  • No aromatherapy support
    SMARTDEVIL H2O Humidifier 2.02.01.0019 does not support aromatherapy; the average humidifier supports aromatherapy.
  • No 360° nozzle
    SMARTDEVIL H2O Humidifier 2.02.01.0019 does not have a 360° nozzle; the average humidifier has a 360° nozzle.
  • 0.51 m shorter power cable
    SMARTDEVIL H2O Humidifier 2.02.01.0019 has a shorter power cable than the average humidifier (1 m vs 1.51 m).
  • 80.8% lower humidification rate
    SMARTDEVIL H2O Humidifier 2.02.01.0019 delivers a lower humidification rate than the average humidifier (50 ml/h vs 260 ml/h).
    What it is: The maximum amount of water the humidifier can release into the air per hour.
    When it matters: A higher rate raises room humidity faster and is more useful in dry or larger spaces.

    Importance: HIGH

    Good value: At least 300 ml/h

    SMARTDEVIL H2O Humidifier 2.02.01.0019 delivers a lower humidification rate than the average humidifier (50 ml/h vs 260 ml/h).50 ml/h vs 260 ml/h
  • No timer
    SMARTDEVIL H2O Humidifier 2.02.01.0019 does not include a programmable timer; the average humidifier includes a programmable timer.
    What it is: Indicates whether the humidifier includes a timer for scheduled operation or shut-off.
    When it matters: A timer helps you limit overnight runtime or arrange operation around your routine.

    Importance: HIGH

    Good value: yes

    SMARTDEVIL H2O Humidifier 2.02.01.0019 does not include a programmable timer; the average humidifier includes a programmable timer.
  • 2.85 L smaller water tank
    SMARTDEVIL H2O Humidifier 2.02.01.0019 has a smaller water tank than the average humidifier (0.5 L vs 3.35 L).
    What it is: The usable amount of water the humidifier’s reservoir can hold.
    When it matters: A larger tank generally needs fewer refills and can support longer operation between top-ups.

    Importance: HIGH

    Good value: At least 4 L

    SMARTDEVIL H2O Humidifier 2.02.01.0019 has a smaller water tank than the average humidifier (0.5 L vs 3.35 L).0.5 L vs 3.35 L
  • No aromatherapy support
    SMARTDEVIL H2O Humidifier 2.02.01.0019 does not support aromatherapy; the average humidifier supports aromatherapy.
    What it is: Indicates whether the humidifier supports the safe use of aromatic oils or fragrance media.
    When it matters: Useful if you want to add fragrance without putting oil directly into the water tank.

    Importance: MEDIUM

    Good value: yes

    SMARTDEVIL H2O Humidifier 2.02.01.0019 does not support aromatherapy; the average humidifier supports aromatherapy.
  • 2 levels less mist control
    SMARTDEVIL H2O Humidifier 2.02.01.0019 offers fewer mist adjustment levels than the average humidifier (1 levels vs 3 levels).
    What it is: The number of manually selectable mist-output levels.
    When it matters: More levels provide finer control over moisture output, noise, and water use.

    Importance: MEDIUM

    Good value: At least 3 levels

    SMARTDEVIL H2O Humidifier 2.02.01.0019 offers fewer mist adjustment levels than the average humidifier (1 levels vs 3 levels).1 levels vs 3 levels
  • No 360° nozzle
    SMARTDEVIL H2O Humidifier 2.02.01.0019 does not have a 360° nozzle; the average humidifier has a 360° nozzle.
    What it is: Whether the humidifier has a nozzle that rotates through 360° to direct the mist.
    When it matters: A rotating nozzle helps redirect mist without moving the humidifier.

    Importance: LOW

    Good value: yes

    SMARTDEVIL H2O Humidifier 2.02.01.0019 does not have a 360° nozzle; the average humidifier has a 360° nozzle.
  • 0.51 m shorter power cable
    SMARTDEVIL H2O Humidifier 2.02.01.0019 has a shorter power cable than the average humidifier (1 m vs 1.51 m).
    What it is: The usable length of the humidifier’s power cable.
    When it matters: A longer cable offers more freedom to place the humidifier away from a wall socket.

    Importance: LOW

    Good value: At least 1.5 m

    SMARTDEVIL H2O Humidifier 2.02.01.0019 has a shorter power cable than the average humidifier (1 m vs 1.51 m).1 m vs 1.51 m
  • 6 hours shorter runtime
    SMARTDEVIL H2O Humidifier 2.02.01.0019 runs for a shorter time than the average humidifier (18 hours vs 24 hours).
    What it is: The longest stated operating time from one full water tank.
    When it matters: Longer runtime means fewer refills during overnight use or extended daily operation.

    Importance: HIGH

    Good value: At least 24 hours

    SMARTDEVIL H2O Humidifier 2.02.01.0019 runs for a shorter time than the average humidifier (18 hours vs 24 hours).18 hours vs 24 hours
Total
Overall
Performance
Features
Design

Graphic comparison of SMARTDEVIL H2O Humidifier 2.02.01.0019 and other products in the Humidifiers category

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Third-party reviews

United Kingdom
amazon
4.0
2990 Reviews
amazon
3.9
1008 Reviews
amazon
3.9
271 Reviews
amazon
3.4
227 Reviews
United States
Amazon_logo.png
4.1
3118 Reviews
Amazon_logo.png
3.9
226 Reviews

(Reviews last updated: August 2026)

What customers like about SMARTDEVIL H2O Humidifier 2.02.01.0019?

  • Whisper-quiet operation under 30 decibels makes it ideal for sleep or workspace use
  • Compact and highly portable desktop layout suitable for travel, bedrooms, and offices
  • Effective at relieving dry sinus passages, dry skin, and chapped lips
  • Features a built-in soft nightlight with constant and breathing illumination settings
  • Automatic safety shut-off activates reliably when the water tank level runs low
  • Offers two distinct misting profiles including continuous and intermittent spray modes

What customers dislike about SMARTDEVIL H2O Humidifier 2.02.01.0019?

  • Strictly bans the usage of distilled or pure water as it causes buildup at the mist outlet
  • The tight, water-resistant casing can make twisting it open to refill quite difficult and stiff
  • Manufacturer advises against adding essential oils as they can clog the replaceable filters
  • Lacks an exterior viewing window or clear water level gauge to easily check remaining volume
  • Does not include an AC wall power adapter in the package, shipping only with a USB cable

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