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LEVOIT OasisMist LUH-O451S-WEU Review | 46 Data compared

Avg. price in UK: ~£90
Avg. price in US: ~$90
Max. CADR: ?
Maximum room area: ?
Maximum noise level: 41 dB
HEPA filter: no
Weight: 2.4 kg

LEVOIT OasisMist LUH-O451S-WEU review. Compare 46 technical specifications and user reviews to see how this product ranks in the Air Purifiers category and whether it is worth buying.

6.4

Good

6.4

Good

?

8.9
Bedroom use
Score components:
35.0%
8.4
Maximum noise level
30.0%
10
Night mode
20.0%
?
Maximum room area
15.0%
9.2
Weight
6.2
Allergy relief
Score components:
35.0%
?
Max. CADR
30.0%
4.0
HEPA filter
20.0%
?
Number of filtration stages
15.0%
4.0
Washable prefilter
6.0
Smoke removal
Score components:
35.0%
4.0
Activated carbon filter
30.0%
?
Max. CADR
20.0%
?
Number of filtration stages
15.0%
4.0
Air quality indicator

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Best prices in UK

N/A~ £90

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Verdict

The Levoit OasisMist LUH-O451S-WEU is an ultrasonic smart humidifier (often mistakenly searched as an air purifier) featuring a 4.5-litre water tank that effectively covers spaces from 20 to 40 square metres with a powerful mist output of 550 mL/h. Main characteristics and pros include its hybrid design offering both warm and cool mist settings, a convenient top-fill layout with dual 360-degree rotating nozzles, an integrated aromatherapy tray, and remote control capabilities through the VeSync app and voice assistants. It operates quietly with noise levels ranging between 26 dB and 41 dB and delivers a continuous runtime of up to 45 hours on its lowest setting. However, notable cons include its strict requirement for regular cleaning every three days to prevent mineral buildup, a higher energy consumption when operating on the warm mist setting, and a tendency to emit slightly more noise during heated operation.

Technical Specifications of air purifier LEVOIT OasisMist LUH-O451S-WEU

Overall score

6.4

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?

Popularity

What it is: An indicator based on the number of reviews received by products in the Air Purifiers category.

When it matters: When you prefer products in the Air Purifiers category that have been chosen and reviewed by many other buyers.

Performance

6.8

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Power

What it is: The electrical power consumption of the air purifier during operation, measured in watts (W).

When it matters: Helpful for estimating long-term electricity costs, particularly when running the unit continuously day and night.

Importance: HIGH

?

Max. CADR

What it is: The Clean Air Delivery Rate (CADR), measuring the volume of purified air delivered per hour in cubic metres.

When it matters: Crucial for determining how rapidly the purifier circulates and cleans room air, especially for severe allergies or larger spaces.

Importance: HIGH

?

Maximum room area

What it is: The maximum recommended floor area (in square metres) that the air purifier can effectively treat.

When it matters: Essential for matching the purifier's airflow capacity to your room size so all air is filtered thoroughly.

Importance: HIGH

?

N. of speeds

What it is: The number of manual airflow speed levels available to choose on the air purifier.

When it matters: Provides flexible control between whisper-quiet low speeds for sleeping and powerful high speeds for fast room clearing.

Importance: MEDIUM

?

Maximum noise level

What it is: The sound level emitted by the air purifier when running at its highest fan speed, measured in decibels (dB).

When it matters: Important if you plan to use the purifier in bedrooms, nurseries, or home offices where loud fan noise causes disturbance.

Importance: HIGH

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Features

5.6

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Air quality indicator

What it is: An optical or laser sensor system displaying real-time indoor pollution levels via color rings or numerical values.

When it matters: Provides immediate visual feedback on air cleanliness and confirms that the purifier is working effectively.

Importance: MEDIUM

Continuous purification

What it is: Engineered motor and filter architecture designed for safe, uninterrupted 24/7 operation without thermal degradation.

When it matters: Essential for maintaining permanently low allergen and dust concentrations in polluted urban areas or high-pollen seasons.

Importance: LOW

Auto mode

What it is: An intelligent operating mode that automatically increases or decreases fan speed based on live sensor pollution readings.

When it matters: Maximizes convenience and saves electricity by running quietly on low speed and ramping up only when pollution is detected.

Importance: MEDIUM

Timer

What it is: A programmable shut-off countdown timer that turns off the air purifier automatically after a set number of hours.

When it matters: Convenient for running the unit for a specific duration before leaving home or going to bed without wasting electricity.

Importance: LOW

Maximum timer

What it is: The longest selectable countdown duration available on the air purifier's timer, expressed in hours.

When it matters: Relevant if you prefer setting extended automated operating cycles, such as a full 8-hour workday or 12-hour overnight window.

Importance: LOW

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Design

7.3

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Color

What it is: The primary exterior color and aesthetic finish of the air purifier housing.

When it matters: Important for ensuring the appliance blends harmoniously into your room decor and furniture style.

Importance: LOW

white

Material

What it is: The primary manufacturing material used for the outer casing, such as ABS plastic, polycarbonate, or aluminum.

When it matters: Influences structural rigidity, scratch resistance, premium appearance, and ease of wiping clean.

Importance: LOW

plastic

Display

What it is: An integrated digital screen showing active fan speed, particulate pollution numbers, filter health, and active timers.

When it matters: Enables quick visual checks of air metrics and purifier settings directly on the device without picking up your phone.

Importance: LOW

Display position

What it is: The physical placement of the display screen on the body of the air purifier (e.g., top panel or front facade).

When it matters: Affects viewing convenience: top displays are easiest to read while standing, while front displays are visible from across the room.

Importance: LOW

front

Control type

What it is: The user interface mechanism for operating the device, such as capacitive touch keys, push buttons, or rotary dials.

When it matters: Determines tactile responsiveness, ease of operation in dark rooms, and durability over years of regular use.

Importance: LOW

touch, app, voice

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LEVOIT OasisMist LUH-O451S-WEU vs the average air purifier

Why is LEVOIT OasisMist LUH-O451S-WEU better than the average air purifier?

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12 dB lower maximum noise level
LEVOIT OasisMist LUH-O451S-WEU runs quieter at maximum speed than the average air purifier (41 dB vs 53 dB).
What it is: The sound level emitted by the air purifier when running at its highest fan speed, measured in decibels (dB).
When it matters: Important if you plan to use the purifier in bedrooms, nurseries, or home offices where loud fan noise causes disturbance.
Importance: HIGH
LEVOIT OasisMist LUH-O451S-WEU runs quieter at maximum speed than the average air purifier (41 dB vs 53 dB).41 dB vs 53 dB
Supports Wi‑Fi
LEVOIT OasisMist LUH-O451S-WEU supports Wi‑Fi; the average air purifier does not.
What it is: Wireless connectivity enabling smartphone app pairing for remote operation, scheduling, and live air quality tracking.
When it matters: Allows you to inspect home pollution levels from work and turn on the purifier so you return home to clean air.
Importance: MEDIUM
LEVOIT OasisMist LUH-O451S-WEU supports Wi‑Fi; the average air purifier does not.
Supports voice control
LEVOIT OasisMist LUH-O451S-WEU supports voice control; the average air purifier does not.
What it is: Integration with voice assistants such as Amazon Alexa, Google Assistant, or Apple Siri for voice commands.
When it matters: Offers convenient hands-free control to adjust fan speeds, check filter status, or turn the purifier on and off.
Importance: LOW
LEVOIT OasisMist LUH-O451S-WEU supports voice control; the average air purifier does not.
47.5% lower weight
LEVOIT OasisMist LUH-O451S-WEU is lighter than the average air purifier (2.4 kg vs 4.57 kg).
What it is: The total physical net weight of the air purifier without packaging, measured in kilograms (kg).
When it matters: Important if you frequently carry the purifier between rooms, to different floors, or place it on furniture.
Importance: MEDIUM
LEVOIT OasisMist LUH-O451S-WEU is lighter than the average air purifier (2.4 kg vs 4.57 kg).2.4 kg vs 4.57 kg
19.6 cm shorter height
LEVOIT OasisMist LUH-O451S-WEU has a lower height than the average air purifier (30.4 cm vs 50 cm).
What it is: The vertical height of the air purifier unit, measured in centimetres (cm).
When it matters: Important for ensuring the unit fits underneath tables, under low window sills, or onto designated shelves.
Importance: LOW
LEVOIT OasisMist LUH-O451S-WEU has a lower height than the average air purifier (30.4 cm vs 50 cm).30.4 cm vs 50 cm
4 hours longer timer
LEVOIT OasisMist LUH-O451S-WEU offers a longer timer duration than the average air purifier (12 hours vs 8 hours).
What it is: The longest selectable countdown duration available on the air purifier's timer, expressed in hours.
When it matters: Relevant if you prefer setting extended automated operating cycles, such as a full 8-hour workday or 12-hour overnight window.
Importance: LOW
LEVOIT OasisMist LUH-O451S-WEU offers a longer timer duration than the average air purifier (12 hours vs 8 hours).12 hours vs 8 hours
55.6% cheaper
LEVOIT OasisMist LUH-O451S-WEU is cheaper than the average air purifier (£90 vs £140).
LEVOIT OasisMist LUH-O451S-WEU is cheaper than the average air purifier (£90 vs £140).£90 vs £140
12 dB lower maximum noise level
LEVOIT OasisMist LUH-O451S-WEU runs quieter at maximum speed than the average air purifier (41 dB vs 53 dB).
Supports Wi‑Fi
LEVOIT OasisMist LUH-O451S-WEU supports Wi‑Fi; the average air purifier does not.
Supports voice control
LEVOIT OasisMist LUH-O451S-WEU supports voice control; the average air purifier does not.
4 hours longer timer
LEVOIT OasisMist LUH-O451S-WEU offers a longer timer duration than the average air purifier (12 hours vs 8 hours).
47.5% lower weight
LEVOIT OasisMist LUH-O451S-WEU is lighter than the average air purifier (2.4 kg vs 4.57 kg).
19.6 cm shorter height
LEVOIT OasisMist LUH-O451S-WEU has a lower height than the average air purifier (30.4 cm vs 50 cm).

Why is LEVOIT OasisMist LUH-O451S-WEU worse than the average air purifier?

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No HEPA filter
LEVOIT OasisMist LUH-O451S-WEU does not have a HEPA filter; the average air purifier does.
No air-quality indicator
LEVOIT OasisMist LUH-O451S-WEU does not have an air-quality indicator; the average air purifier does.
No activated carbon filter
LEVOIT OasisMist LUH-O451S-WEU does not have an activated carbon filter; the average air purifier does.
No washable prefilter
LEVOIT OasisMist LUH-O451S-WEU does not have a washable prefilter; the average air purifier does.
No dirty-filter indicator
LEVOIT OasisMist LUH-O451S-WEU does not have a dirty-filter indicator; the average air purifier does.
No continuous purification
LEVOIT OasisMist LUH-O451S-WEU does not support continuous purification; the average air purifier does.
Not suitable for reducing airborne mold spores
LEVOIT OasisMist LUH-O451S-WEU is not suitable for reducing airborne mold spores, the average air purifier is.
Not specifically suitable for homes with pets
LEVOIT OasisMist LUH-O451S-WEU is not specifically suitable for homes with pets, unlike the average air purifier.
5.4 cm greater depth
LEVOIT OasisMist LUH-O451S-WEU is deeper than the average air purifier (27.4 cm vs 22 cm).
8433.92 cm³ larger external volume
LEVOIT OasisMist LUH-O451S-WEU has a larger overall volume than the average air purifier (22823.1 cm³ vs 31257.025 cm³).
0.1 cm wider width
LEVOIT OasisMist LUH-O451S-WEU is wider than the average air purifier (27.4 cm vs 27.3 cm).
No HEPA filter
LEVOIT OasisMist LUH-O451S-WEU does not have a HEPA filter; the average air purifier does.
What it is: A High-Efficiency Particulate Air filter that traps at least 99.97% of microscopic airborne particles down to 0.3 microns.
When it matters: Essential for allergy and asthma sufferers who require medical-grade capture of pollen, dust mite allergens, and fine pet dander.
Importance: HIGH
LEVOIT OasisMist LUH-O451S-WEU does not have a HEPA filter; the average air purifier does.
No air-quality indicator
LEVOIT OasisMist LUH-O451S-WEU does not have an air-quality indicator; the average air purifier does.
What it is: An optical or laser sensor system displaying real-time indoor pollution levels via color rings or numerical values.
When it matters: Provides immediate visual feedback on air cleanliness and confirms that the purifier is working effectively.
Importance: MEDIUM
LEVOIT OasisMist LUH-O451S-WEU does not have an air-quality indicator; the average air purifier does.
No activated carbon filter
LEVOIT OasisMist LUH-O451S-WEU does not have an activated carbon filter; the average air purifier does.
What it is: A porous carbon layer that adsorbs volatile organic compounds (VOCs), chemical vapors, cooking smells, and tobacco smoke.
When it matters: Crucial for eliminating persistent household odors, cooking fumes, tobacco smoke, and chemical gas pollutants that HEPA cannot trap.
Importance: HIGH
LEVOIT OasisMist LUH-O451S-WEU does not have an activated carbon filter; the average air purifier does.
No washable prefilter
LEVOIT OasisMist LUH-O451S-WEU does not have a washable prefilter; the average air purifier does.
What it is: A reusable outer mesh screen that traps hair, pet fur, and coarse dust, and can be rinsed clean under running water.
When it matters: Substantially extends the lifespan of expensive inner HEPA and carbon filters by stopping large debris from clogging them.
Importance: MEDIUM
LEVOIT OasisMist LUH-O451S-WEU does not have a washable prefilter; the average air purifier does.
No dirty-filter indicator
LEVOIT OasisMist LUH-O451S-WEU does not have a dirty-filter indicator; the average air purifier does.
What it is: A sensor-driven warning light or display icon alerting you when filters have reached saturation and need replacement or cleaning.
When it matters: Prevents the purifier from circulating uncleaned air with clogged filters and ensures you never replace filters earlier than necessary.
Importance: MEDIUM
LEVOIT OasisMist LUH-O451S-WEU does not have a dirty-filter indicator; the average air purifier does.
No continuous purification
LEVOIT OasisMist LUH-O451S-WEU does not support continuous purification; the average air purifier does.
What it is: Engineered motor and filter architecture designed for safe, uninterrupted 24/7 operation without thermal degradation.
When it matters: Essential for maintaining permanently low allergen and dust concentrations in polluted urban areas or high-pollen seasons.
Importance: LOW
LEVOIT OasisMist LUH-O451S-WEU does not support continuous purification; the average air purifier does.
5.4 cm greater depth
LEVOIT OasisMist LUH-O451S-WEU is deeper than the average air purifier (27.4 cm vs 22 cm).
What it is: The front-to-back depth measurement of the air purifier, in centimetres (cm).
When it matters: Determines how far the purifier protrudes outward into walkways or away from walls.
Importance: LOW
LEVOIT OasisMist LUH-O451S-WEU is deeper than the average air purifier (27.4 cm vs 22 cm).27.4 cm vs 22 cm
6.23x less popular
LEVOIT OasisMist LUH-O451S-WEU is less popular than the average air purifier (1 vs 6.23).
What it is: An indicator based on the number of reviews received by products in the Air Purifiers category.
When it matters: When you prefer products in the Air Purifiers category that have been chosen and reviewed by many other buyers.
LEVOIT OasisMist LUH-O451S-WEU is less popular than the average air purifier (1 vs 6.23).1 vs 6.23

Graphic comparison of LEVOIT OasisMist LUH-O451S-WEU and other products in the Air Purifiers category

Attribute category

Attribute

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Third-party reviews

What customers like about LEVOIT OasisMist LUH-O451S-WEU?

Dual mist modes: Effectively offers both warm and cool mist operation to suit different preferences and seasons.
Powerful humidification: Quickly adds moisture to large spaces, utilizing an ultrasonic and steam vortex effect for wide mist coverage.
Smart connectivity: Features an excellent VeSync app for seamless remote control, scheduling, and real-time humidity monitoring.
Convenient top-fill design: Large opening and a built-in handle make refilling and cleaning the water tank hassle-free.
Quiet operation: Runs very quietly (as low as 26dB), making it highly suitable for bedrooms and nurseries.
Plant-care support: Includes specialized features and encyclopedias for plant care.

What customers dislike about LEVOIT OasisMist LUH-O451S-WEU?

High water consumption: The powerful mist generation drains the tank quickly, meaning it often requires daily refills.
Maintenance requirements: Regular cleaning is necessary to prevent mineral buildup and keep the unit functioning perfectly.

Expert reviews

techgearlab.com

19/08/2025

Summary of the review

Levoit OasisMist 450S Smart Review | Tested & Rated

The Levoit OasisMist 450S Smart is lauded by TechGearLab for its exceptionally powerful, rapid humidification, offering both warm and cool mist options, along with a polished VeSync app for remote control. Key drawbacks noted include high power consumption in warm mist mode, reduced runtime at maximum settings, and potential white dust buildup with tap water. It is highly recommended for users prioritizing maximum moisture output and smart features.

apartmenttherapy.com

01/09/2023

Summary of the review

Why We Love the Levoit OasisMist Smart Humidifier

The Apartment Therapy review highly praises the Levoit OasisMist Smart Humidifier for its dual-temperature control, which efficiently provides both warm and cool mist, alongside a user-friendly top-fill design and smart app functionality. While the unit excels at rapidly moisturizing large spaces, high-performance usage may require daily tank refills rather than achieving the maximum 45-hour runtime.

apartmenttherapy.com

01/09/2023

Summary of the review

Why We Love the Levoit OasisMist Smart Humidifier

Apartment Therapy is a digital media platform focused on maximizing small spaces, offering authentic, real-life home tours, and practical, actionable DIY advice. A key pro is its showcase of realistic, unstaged interior layouts, though a con is that content can be highly subjective due to user-curated content. Another limitation is that some, though not all, of the, site's, advice on, real estate and, renting, is, heavily tailored to specific, major, city, markets.

consumerreports.org

N/A

Summary of the review

Levoit OasisMist 450s Smart - Humidifiers - Consumer Reports

The Consumer Reports review of the Levoit OasisMist 450S Smart humidifier identifies it as a highly effective, filter-free, ultrasonic dual-mist unit capable of outputting 1.9 gallons daily for spaces up to 430 square feet, with features like an integrated humidistat, low operating costs, and automatic shut-off. Key drawbacks noted include the lack of programmability and a nightlight, no antimicrobial claims, and a requirement for mandatory weekly cleaning.

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