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LEVOIT OasisMist 450S Review | 43 Data compared

Avg. price in UK: ~£90
Avg. price in US: ~$80
Humidification rate: 550 ml/h
Maximum room area: 39.95 m²
Water tank capacity: 4.5 L
Maximum operating time: 45 hours
Maximum noise level: 41 dB

LEVOIT OasisMist 450S review. Compare 43 technical specifications and user reviews to see how this product ranks in the Humidifiers category and whether it is worth buying.

8.3

Excellent

8.1

Excellent

9.2

Exceptional

7.4
Bedroom use
Score components:
35.0%
3.0
Maximum noise level
25.0%
9.3
Maximum operating time
20.0%
10
Timer
20.0%
10
Automatic low-water shut-off
8.5
Large rooms
Score components:
35.0%
10
Humidification rate
30.0%
6.8
Maximum room area
25.0%
7.6
Water tank capacity
10.0%
10
Hygrostat
9.4
Plant care
Score components:
30.0%
10
Hygrostat
25.0%
10
Humidification rate
25.0%
7.6
Water tank capacity
20.0%
10
360° nozzle

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Verdict

The LEVOIT OasisMist 450S is a smart ultrasonic hybrid humidifier featuring a 4.5-liter (1.19-gallon) top-fill water tank, a powerful 550 mL/h mist output, and a rated power of 280W, designed to effectively cover rooms between 215 to 430 square feet. Its main characteristics and advantages include dual warm and cool mist settings, dual 360-degree rotating nozzles, an automatic mode governed by built-in humidity sensors, a dedicated aromatherapy box, smart control via the VeSync app with voice assistant compatibility, and ultra-quiet operation starting at under 26 decibels with a maximum runtime of up to 45 hours on low cool mist. However, notable drawbacks include high power consumption during warm mist operation, a significantly reduced runtime of under 20 hours when using both mist modes simultaneously, a risk of white mineral dust buildup if distilled water is not used, and a few tight internal spots within the base chamber that complicate manual descaling and deep cleaning.

Technical Specifications of humidifier LEVOIT OasisMist 450S

Overall score

8.3

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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.

Performance

7.6

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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

ultrasonic

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

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

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

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Features

9.1

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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

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

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

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

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

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Design

6.7

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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

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

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LEVOIT OasisMist 450S vs the average humidifier

Why is LEVOIT OasisMist 450S better than the average humidifier?

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2.12x higher humidification rate
LEVOIT OasisMist 450S delivers a higher humidification rate than the average humidifier (550 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
LEVOIT OasisMist 450S delivers a higher humidification rate than the average humidifier (550 ml/h vs 260 ml/h).550 ml/h vs 260 ml/h
Warm-mist option
LEVOIT OasisMist 450S offers a warm-mist option; the average humidifier does not offer a warm-mist option.
Supports both warm and cool mist.
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
LEVOIT OasisMist 450S offers a warm-mist option; the average humidifier does not offer a warm-mist option.
Wi-Fi control
LEVOIT OasisMist 450S supports Wi-Fi control; the average humidifier does not support Wi-Fi control.
What it is: Indicates whether the humidifier connects to Wi-Fi for remote app-based features.
When it matters: Wi-Fi matters if you want to adjust settings or monitor the humidifier away from its controls.
Importance: HIGH
Good value: yes
LEVOIT OasisMist 450S supports Wi-Fi control; the average humidifier does not support Wi-Fi control.
Voice control supported
LEVOIT OasisMist 450S supports voice control; the average humidifier does not support voice control.
What it is: Indicates whether the humidifier can be operated through a compatible voice assistant.
When it matters: Voice control is useful for hands-free adjustment and smart-home routines.
Importance: MEDIUM
Good value: yes
LEVOIT OasisMist 450S supports voice control; the average humidifier does not support voice control.
Hygrostat included
LEVOIT OasisMist 450S 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
LEVOIT OasisMist 450S has a hygrostat; the average humidifier has no hygrostat.
21 hours longer runtime
LEVOIT OasisMist 450S runs longer on a single fill than the average humidifier (45 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
LEVOIT OasisMist 450S runs longer on a single fill than the average humidifier (45 hours vs 24 hours).45 hours vs 24 hours
Dedicated aroma compartment
LEVOIT OasisMist 450S 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.
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
LEVOIT OasisMist 450S includes a dedicated aroma compartment; the average humidifier does not include a dedicated aroma compartment.
4.36 cm narrower body
LEVOIT OasisMist 450S has a narrower body than the average humidifier (15.2 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
LEVOIT OasisMist 450S has a narrower body than the average humidifier (15.2 cm vs 19.555 cm).15.2 cm vs 19.555 cm
2.12x higher humidification rate
LEVOIT OasisMist 450S delivers a higher humidification rate than the average humidifier (550 ml/h vs 260 ml/h).
Hygrostat included
LEVOIT OasisMist 450S has a hygrostat; the average humidifier has no hygrostat.
21 hours longer runtime
LEVOIT OasisMist 450S runs longer on a single fill than the average humidifier (45 hours vs 24 hours).
6 levels more mist control
LEVOIT OasisMist 450S offers more mist adjustment levels than the average humidifier (9 levels vs 3 levels).
1.15 L larger water tank
LEVOIT OasisMist 450S has a larger water tank than the average humidifier (4.5 L vs 3.35 L).
8.95 m² more room coverage
LEVOIT OasisMist 450S covers larger rooms than the average humidifier (40 m² vs 31 m²).
Warm-mist option
LEVOIT OasisMist 450S offers a warm-mist option; the average humidifier does not offer a warm-mist option.
Wi-Fi control
LEVOIT OasisMist 450S supports Wi-Fi control; the average humidifier does not support Wi-Fi control.
Voice control supported
LEVOIT OasisMist 450S supports voice control; the average humidifier does not support voice control.
Dedicated aroma compartment
LEVOIT OasisMist 450S includes a dedicated aroma compartment; the average humidifier does not include a dedicated aroma compartment.
4.36 cm narrower body
LEVOIT OasisMist 450S has a narrower body than the average humidifier (15.2 cm vs 19.555 cm).
Display included
LEVOIT OasisMist 450S has a display; the average humidifier does not have a display.
0.06 m longer power cable
LEVOIT OasisMist 450S has a longer power cable than the average humidifier (1.6 m vs 1.51 m).

Why is LEVOIT OasisMist 450S worse than the average humidifier?

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7.9 dB higher maximum noise
LEVOIT OasisMist 450S is louder at maximum output than the average humidifier (41 dB vs 33.1 dB).
256 W higher power draw
LEVOIT OasisMist 450S draws more power than the average humidifier (280 W vs 24 W).
9.15 cm deeper body
LEVOIT OasisMist 450S has a deeper profile than the average humidifier (27.4 cm vs 18.25 cm).
62.2% heavier
LEVOIT OasisMist 450S is heavier than the average humidifier (2.4 kg vs 1.48 kg).
1.42 cm taller body
LEVOIT OasisMist 450S stands taller than the average humidifier (30.4 cm vs 28.98 cm).
7.9 dB higher maximum noise
LEVOIT OasisMist 450S is louder at maximum output than the average humidifier (41 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
LEVOIT OasisMist 450S is louder at maximum output than the average humidifier (41 dB vs 33.1 dB).41 dB vs 33.1 dB
256 W higher power draw
LEVOIT OasisMist 450S draws more power than the average humidifier (280 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
LEVOIT OasisMist 450S draws more power than the average humidifier (280 W vs 24 W).280 W vs 24 W
9.15 cm deeper body
LEVOIT OasisMist 450S has a deeper profile than the average humidifier (27.4 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
LEVOIT OasisMist 450S has a deeper profile than the average humidifier (27.4 cm vs 18.25 cm).27.4 cm vs 18.25 cm
62.2% heavier
LEVOIT OasisMist 450S is heavier than the average humidifier (2.4 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
LEVOIT OasisMist 450S is heavier than the average humidifier (2.4 kg vs 1.48 kg).2.4 kg vs 1.48 kg
2.57x more expensive
LEVOIT OasisMist 450S is more expensive than the average humidifier (£90 vs £35).
LEVOIT OasisMist 450S is more expensive than the average humidifier (£90 vs £35).£90 vs £35
1.42 cm taller body
LEVOIT OasisMist 450S stands taller than the average humidifier (30.4 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
LEVOIT OasisMist 450S stands taller than the average humidifier (30.4 cm vs 28.98 cm).30.4 cm vs 28.98 cm

Graphic comparison of LEVOIT OasisMist 450S and other products in the Humidifiers category

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Third-party reviews

United Kingdom

United States

(Reviews last updated: August 2026)

What customers like about LEVOIT OasisMist 450S?

Dual mist functionality offering both warm and cool mist options.
Powerful and fast humidification capable of covering medium to large rooms quickly.
Convenient top-fill design that prevents messy spills and makes refilling easy.
Excellent smart integration via the VeSync app for scheduling and remote tracking.
Whisper-quiet operation especially while running on the low cool mist setting.
Dual 360-degree rotating nozzles that allow precise direction of the mist output.
Built-in aromatherapy tray for adding essential oils.

What customers dislike about LEVOIT OasisMist 450S?

High power consumption and energy use when running the warm mist setting continuously.
Shorter runtime and frequent refills required when both warm and cool modes blast together.
Risk of white mineral dust build-up unless distilled or reverse osmosis water is used.
Base unit cleaning can be tedious due to several tight nooks, crannies, and components.
Warm mist mode slightly increases the operational noise level with a boiling or clicking sound.
Built-in humidistat sensor can sometimes read slightly higher or different from actual room levels.

Expert reviews

techgearlab.com

19/08/2025

Summary of the review

Levoit OasisMist 450S Smart Review | Tested & Rated

The Levoit OasisMist 450S Smart, designated as the best overall humidifier by TechGearLab, features a dual-technology system that efficiently raises room humidity using both warm and cool mist. Key strengths include top-tier performance, a convenient top-fill design, and comprehensive app integration, though it is balanced by high energy consumption on warm settings, frequent daily refills, and a relatively complex cleaning process.

techgearlab.com

19/08/2025

Summary of the review

The Best Humidifiers | Lab Tested & Ranked

Following lab testing of 14 models, the TechGearLab review selects the Levoit Oasis Mist 450S Smart as the best overall for its versatile, plant-friendly operation, while the Levoit LV600S Smart Hybrid is recommended for large rooms despite high power consumption and frequent refilling. For budget-conscious users, the intuitive Dreo HM311 is top-rated, while overall testing emphasized metrics including moisture output and maintenance.

faz.net

07/04/2026

Summary of the review

The Best Humidifier | Test 08/2026 | F.A.Z. Kaufkompass

F.A.Z. Kaufkompass tested 59 humidifiers, naming the Philips HU5710/03 as the winner for its even, rapid humidification and intuitive LED interface. While the top-rated evaporator avoids over-humidification, a key con is the presence of zinc pyrithione in its filter assembly. The review also highlights the Boneco S250 as an effective vaporiser alternative, offering excellent hygiene and strong output despite high energy consumption. Kaufkompass.

je-suis-papa.ouest-france.fr

18/05/2026

Summary of the review

Levoit OasisMist 450S Humidifier: Full Review and Testing

The Levoit OasisMist 450S is rated 9.7/10 by Je suis papa as a top-tier, smart humidifier, boasting a 4.5-liter tank, quiet operation for nurseries, and comprehensive VeSync app control for optimal 40%-60% humidity levels. While delivering powerful performance, the €99.99 unit is deemed expensive if smart features are unused and requires diligent, bi-weekly white vinegar maintenance to clean hard-to-reach areas of the water base.

lavelab.com

17/11/2025

Summary of the review

The Best Air Humidifiers 2026 | Tested by Lavelab

The Lavelab review identifies top air humidifiers, highlighting the budget-friendly Levoit Classic 160 for its simple, efficient, knob-adjusted performance. Key advantages across recommended units include quiet operation and top-filling, user-friendly designs, while primary drawbacks involve necessary regular maintenance and potential reliability issues on entry-level models.

lavelab.com

17/11/2025

Summary of the review

The Best Air Humidifiers 2026 | Tested by Lavelab

The Lavelab review identifies the Levoit Classic 160 Ultrasonic Cool Mist as a top-performing, user-friendly humidifier capable of raising room humidity by up to 25% in one hour. Key advantages include a compact design, a 2.5-liter tank offering 25 hours of runtime, a quiet 31 dB noise level, and a dishwasher-safe tank, though it lacks advanced features due to its simple mechanical control.

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