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Sejoy Top Fill 4L Review | 43 Data compared

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  • Avg. price in UK: ~£20
  • Avg. price in US: ~$20
  • Humidification rate: 300 ml/h
  • Maximum room area: 30 m²
  • Water tank capacity: 4 L
  • Maximum operating time: 30 hours
  • Maximum noise level: 30 dB

Sejoy Top Fill 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.

6.3

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%

6.4

Technical Score

20.0%

6.0

User score

Good
6.4

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%

7.3

Performance

40.0%

6.2

Features

15.0%

4.1

Design

Good
6.0

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%

7.2

User reviews

30.0%

3.1

Popularity

User score:
United Kingdom
amazon
3.9
(74)
amazon
3.2
(58)
United States
Amazon_logo.png
4.0
(74)
Amazon_logo.png
3.2
(58)

(Reviews last updated: August 2026)

Good
  • 7.3
    Bedroom use

    Score components:

    35.0%

    8.5

    Maximum noise level

    25.0%

    6.0

    Maximum operating time

    20.0%

    4.0

    Timer

    20.0%

    10

    Automatic low-water shut-off

  • 6.8
    Large rooms

    Score components:

    35.0%

    7.4

    Humidification rate

    30.0%

    4.8

    Maximum room area

    25.0%

    6.8

    Water tank capacity

    10.0%

    10

    Hygrostat

  • 7.4
    Plant care

    Score components:

    30.0%

    10

    Hygrostat

    25.0%

    7.4

    Humidification rate

    25.0%

    6.8

    Water tank capacity

    20.0%

    4.0

    360° nozzle

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Best prices in UK

Best rankings

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

Verdict

The Sejoy Top Fill 4L Humidifier is a 28W tabletop ultrasonic device featuring a 4-litre (1-gallon) water tank, an LED touch screen display, and a 3-speed adjustable mist output. It is engineered with intelligent constant humidity control (adjustable from 45% to 80% RH), a 360-degree rotating nozzle, an integrated aromatherapy diffuser, and a 7-colour night light. Main advantages include an easy-to-refill top-fill design, whisper-quiet operation with a sound-absorbing sponge, water-shortage auto-shutoff protection, and a long runtime of up to 30 to 32 hours on its lowest setting. However, notable drawbacks include a lack of a remote control, potential difficulties when cleaning the internal components thoroughly, and a user manual that some consumers find lacks detail.

Technical Specifications of humidifier Sejoy Top Fill 4L

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%

7.3

Performance

40.0%

6.2

Features

15.0%

4.1

Design

6.4
Sejoy Top Fill 4L has a technical score of 6.36 points, which is lower than 60.4% 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%

7.2

User reviews

30.0%

3.1

Popularity

User score:
United Kingdom
amazon
3.9
(74)
amazon
3.2
(58)
United States
Amazon_logo.png
4.0
(74)
Amazon_logo.png
3.2
(58)

(Reviews last updated: August 2026)

6.0
Sejoy Top Fill 4L has a user score of 5.96 points, which is lower than 96% 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.
3.1
Sejoy Top Fill 4L has a popularity of 3.1 points, which is lower than 75.2% 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%

6.3

Overall score

40.0%

10

Price

7.4
Sejoy Top Fill 4L has a quality-to-price ratio of 7.4 points, which is lower than 52.4% 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

300 ml/h
Sejoy Top Fill 4L delivers a humidification rate of 300 ml/h, which is higher than that of 55.7% of humidifiers and equal to that of 17.9% 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

30 m²
Sejoy Top Fill 4L covers rooms up to 30 m², which is smaller than that of 50.7% of humidifiers and equal to that of 16.2% of humidifiers.
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

4 L
Sejoy Top Fill 4L 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
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

30 hours
Sejoy Top Fill 4L 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
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
Sejoy Top Fill 4L 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

yes
Sejoy Top Fill 4L supports aromatherapy. Aromatherapy support is available in 73.8% 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

yes
Sejoy Top Fill 4L includes a dedicated aroma compartment. A dedicated aroma compartment is present in 48.3% 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
Sejoy Top Fill 4L 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

no
Sejoy Top Fill 4L does not include a water-level indicator. A water-level indicator is present in 84.6% of humidifiers.
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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

white
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
Sejoy Top Fill 4L 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

yes
Sejoy Top Fill 4L has a display. A display is included in 43.6% of humidifiers.
Show more

Sejoy Top Fill 4L vs the average humidifier

  • Hygrostat included
    Sejoy Top Fill 4L has a hygrostat; the average humidifier has no hygrostat.
    What it is: Whether the humidifier can sense room humidity and regulate its output automatically.
    When it matters: A hygrostat helps maintain a chosen humidity target without constant manual adjustment or unnecessary operation.

    Importance: HIGH

    Good value: yes

    Sejoy Top Fill 4L has a hygrostat; the average humidifier has no hygrostat.
  • Dedicated aroma compartment
    Sejoy Top Fill 4L includes a dedicated aroma compartment; the average humidifier does not include a 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

    Sejoy Top Fill 4L includes a dedicated aroma compartment; the average humidifier does not include a dedicated aroma compartment.
  • Display included
    Sejoy Top Fill 4L has a display; the average humidifier does not have a 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

    Sejoy Top Fill 4L has a display; the average humidifier does not have a display.
  • 15.4% higher humidification rate
    Sejoy Top Fill 4L delivers a higher humidification rate than the average humidifier (300 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

    Sejoy Top Fill 4L delivers a higher humidification rate than the average humidifier (300 ml/h vs 260 ml/h).300 ml/h vs 260 ml/h
  • 3.1 dB lower maximum noise
    Sejoy Top Fill 4L 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

    Sejoy Top Fill 4L is quieter at maximum output than the average humidifier (30 dB vs 33.1 dB).30 dB vs 33.1 dB
  • 8.38 cm shorter body
    Sejoy Top Fill 4L has a lower profile than the average humidifier (20.6 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

    Sejoy Top Fill 4L has a lower profile than the average humidifier (20.6 cm vs 28.98 cm).20.6 cm vs 28.98 cm
  • 6 hours longer runtime
    Sejoy Top Fill 4L runs longer on a single fill than the average humidifier (30 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

    Sejoy Top Fill 4L runs longer on a single fill than the average humidifier (30 hours vs 24 hours).30 hours vs 24 hours
  • 0.65 L larger water tank
    Sejoy Top Fill 4L has a larger water tank than the average humidifier (4 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

    Sejoy Top Fill 4L has a larger water tank than the average humidifier (4 L vs 3.35 L).4 L vs 3.35 L
  • Hygrostat included
    Sejoy Top Fill 4L has a hygrostat; the average humidifier has no hygrostat.
  • 15.4% higher humidification rate
    Sejoy Top Fill 4L delivers a higher humidification rate than the average humidifier (300 ml/h vs 260 ml/h).
  • 3.1 dB lower maximum noise
    Sejoy Top Fill 4L is quieter at maximum output than the average humidifier (30 dB vs 33.1 dB).
  • 6 hours longer runtime
    Sejoy Top Fill 4L runs longer on a single fill than the average humidifier (30 hours vs 24 hours).
  • 0.65 L larger water tank
    Sejoy Top Fill 4L has a larger water tank than the average humidifier (4 L vs 3.35 L).
  • Dedicated aroma compartment
    Sejoy Top Fill 4L includes a dedicated aroma compartment; the average humidifier does not include a dedicated aroma compartment.
  • Display included
    Sejoy Top Fill 4L has a display; the average humidifier does not have a display.
  • 8.38 cm shorter body
    Sejoy Top Fill 4L has a lower profile than the average humidifier (20.6 cm vs 28.98 cm).

Total
Overall
Performance
Features
Design
  • 4 W higher power draw
    Sejoy Top Fill 4L draws more power than the average humidifier (28 W vs 24 W).
  • 1 m² less room coverage
    Sejoy Top Fill 4L covers smaller rooms than the average humidifier (30 m² vs 31 m²).
  • 5 % RH higher target humidity
    Sejoy Top Fill 4L requires a higher minimum target humidity than the average humidifier (45% RH vs 40% RH).
  • No timer
    Sejoy Top Fill 4L does not include a programmable timer; the average humidifier includes a programmable timer.
  • No water-level indicator
    Sejoy Top Fill 4L does not include a water-level indicator; the average humidifier includes a water-level indicator.
  • 15.55 cm deeper body
    Sejoy Top Fill 4L has a deeper profile than the average humidifier (33.8 cm vs 18.25 cm).
  • 14.25 cm wider body
    Sejoy Top Fill 4L has a wider body than the average humidifier (33.8 cm vs 19.555 cm).
  • 79.1% heavier
    Sejoy Top Fill 4L is heavier than the average humidifier (2.7 kg vs 1.48 kg).
  • No 360° nozzle
    Sejoy Top Fill 4L does not have a 360° nozzle; the average humidifier has a 360° nozzle.
  • No timer
    Sejoy Top Fill 4L 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

    Sejoy Top Fill 4L does not include a programmable timer; the average humidifier includes a programmable timer.
  • No water-level indicator
    Sejoy Top Fill 4L does not include a water-level indicator; the average humidifier includes a 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

    Sejoy Top Fill 4L does not include a water-level indicator; the average humidifier includes a water-level indicator.
  • 15.55 cm deeper body
    Sejoy Top Fill 4L has a deeper profile than the average humidifier (33.8 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

    Sejoy Top Fill 4L has a deeper profile than the average humidifier (33.8 cm vs 18.25 cm).33.8 cm vs 18.25 cm
  • 14.25 cm wider body
    Sejoy Top Fill 4L has a wider body than the average humidifier (33.8 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

    Sejoy Top Fill 4L has a wider body than the average humidifier (33.8 cm vs 19.555 cm).33.8 cm vs 19.555 cm
  • 79.1% heavier
    Sejoy Top Fill 4L is heavier than the average humidifier (2.7 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

    Sejoy Top Fill 4L is heavier than the average humidifier (2.7 kg vs 1.48 kg).2.65 kg vs 1.48 kg
  • No 360° nozzle
    Sejoy Top Fill 4L 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

    Sejoy Top Fill 4L does not have a 360° nozzle; the average humidifier has a 360° nozzle.
  • 4 W higher power draw
    Sejoy Top Fill 4L draws more power than the average humidifier (28 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

    Sejoy Top Fill 4L draws more power than the average humidifier (28 W vs 24 W).28 W vs 24 W
  • 1 m² less room coverage
    Sejoy Top Fill 4L covers smaller rooms than the average humidifier (30 m² vs 31 m²).
    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

    Sejoy Top Fill 4L covers smaller rooms than the average humidifier (30 m² vs 31 m²).30 m² vs 31 m²
Total
Overall
Performance
Features
Design

Graphic comparison of Sejoy Top Fill 4L and other products in the Humidifiers category

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Third-party reviews

United Kingdom
amazon
3.9
74 Reviews
amazon
3.2
58 Reviews
United States
Amazon_logo.png
4.0
74 Reviews
Amazon_logo.png
3.2
58 Reviews

(Reviews last updated: August 2026)

What customers like about Sejoy Top Fill 4L?

  • Convenient top-fill design eliminates the need to disassemble the unit for refilling.
  • Generous 4-liter tank capacity provides long continuous runtimes up to 24 hours without frequent refills.
  • Whisper-quiet ultrasonic operation makes it highly suitable for bedrooms and nurseries.
  • Effective at relieving dry skin, sinus congestion, and preventing nosebleeds.
  • Features helpful smart functions including adjustable mist levels and an intelligent constant humidity mode.
  • Includes an integrated essential oil tray for aromatherapy benefits.

What customers dislike about Sejoy Top Fill 4L?

  • The tank's tall and narrow geometry makes it difficult to reach the very bottom for thorough cleaning.
  • Components are not dishwasher safe and require demanding manual maintenance.
  • Risk of water leakage or bubbling over if the water tank cap is not perfectly aligned and locked.
  • Can cause over-humidification and excess moisture if used in very small spaces.
  • The clear plastic part of the housing cannot be unscrewed, hindering visibility cleanup over time.

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