Humidifiers · Head-to-head
Levoit Sprout Evaporative Humidifier (LEH-B381S-WNA) vs Levoit Superior Studio Smart 450S
Best Quiet for Small Bedrooms
Levoit Sprout Evaporative Humidifier (LEH-B381S-WNA)
7.5/10
$169.99 at Amazon
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Best Low-Waste Wick (Preliminary)
Levoit Superior Studio Smart 450S
7.6/10
$139.99 at Amazon
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The short answer
Levoit Sprout Evaporative Humidifier (LEH-B381S-WNA) and Levoit Superior Studio Smart 450S finish almost level in our scoring (7.5 vs 7.6 out of 10), so the right pick depends on what you value most. Levoit Sprout Evaporative Humidifier (LEH-B381S-WNA) is stronger on hygiene & ease of cleaning, quiet & sleep-friendly and ease of use. Levoit Superior Studio Smart 450S is stronger on humidifying performance and value. At current verified prices, the Levoit Superior Studio Smart 450S costs about $30.00 less.
- Choose the Levoit Sprout Evaporative Humidifier (LEH-B381S-WNA) if: Light sleepers in bedrooms under about 220 sq ft who want a dimmable, dishwasher-safe evaporative unit.
- Choose the Levoit Superior Studio Smart 450S if: Medium rooms where the owner will wash a wick weekly to avoid buying disposable ones. Evidence is still early.
Scores by criterion
| Criterion | Levoit Sprout Evaporative Humidifier (LEH-B381S-WNA) | Levoit Superior Studio Smart 450S |
|---|---|---|
| Hygiene & Ease of Cleaning | 8.4Dishwasher-safe tank, auto-dry, and cleaning rated 4.8/5 (Bob Vila). | 7.8Washable antimicrobial wick and top-fill (manufacturer claims). Dishwasher safety is unconfirmed. |
| Humidifying Performance | 6.0Rated for only 219 sq ft, with effectiveness 4.3/5 (Bob Vila). | 7.5Fast 30%→60% RH in RTINGS's preliminary data, which is unconfirmed. |
| Quiet & Sleep-Friendly | 8.8About 20 dB in sleep mode per Bob Vila, with a dimmable light. | 7.5Preliminary RTINGS range of about 31.7–45.3 dBA. The 19 dB figure is Levoit's. |
| Health, Safety & Materials | 7.8Evaporative with a separate RH sensor. The lid that doesn't screw on is a child-safety caveat. | 7.6Antimicrobial claims come from the manufacturer only. Resin undisclosed. |
| Ease of Use | 8.0Top-fill, app control and auto mode. | 7.2Top-fill with app control, but RTINGS lists only a 14-hour runtime. |
| Value | 6.0$169.99 for 1 gallon plus $29.99 wicks. | 7.8Low consumable cost if the 2-year wick claim holds. |
Specifications
| Spec | Levoit Sprout Evaporative Humidifier (LEH-B381S-WNA) | Levoit Superior Studio Smart 450S |
|---|---|---|
| Humidifier type | Evaporative (wick) with water and air filters | Evaporative (washable wick) |
| Water tank material | — | Antimicrobial-treated water-contact surfaces (resin not disclosed) |
| Tank capacity | 3.8 L | 4.5 L |
| Max runtime per tank (manufacturer) | 36 hours | 40 hours |
| Rated room coverage | 219 sq ft | 600 sq ft |
| Noise (manufacturer-rated or lab-measured) | 45 dB | 45 dB |
| Top-fill tank | Yes | Yes |
| Requires replaceable filter/cartridge | Yes | Yes |
| Built-in humidistat / auto mode | Yes | Yes |
| Built-in night light | Yes | No |
| Built-in white-noise / sound machine | No | No |
| Dishwasher-safe water-contact parts | Yes | — |
| Mist temperature | Cool (invisible vapor) | Cool (invisible vapor) |
| Wi-Fi app / voice control | Yes | Yes |
| White dust / mineral dispersal risk (per EPA type guidance) | Low – evaporative (EPA: not expected to disperse substantial minerals) | Low – evaporative (EPA: not expected to disperse substantial minerals) |
| Wick replacement interval / cost | Replacement wick filter $29.99 (Levoit); interval not stated | Washable wick rated up to 2 years with weekly washing; replacement $24.99 (Levoit press release) |
| Antimicrobial / UV measures | Auto-dry fan dries wick after use | Manufacturer claim: EPA-registered antimicrobial wick and surfaces; ASTM G21 Grade 0 (Levoit) |
| Warranty | 2 years | 2 years |
Levoit Sprout Evaporative Humidifier (LEH-B381S-WNA)
Pros
- About 20 dB in sleep mode in Bob Vila's test
- Dishwasher-safe top-fill tank
- Dimmable light
- Auto mode with separate humidity sensor
- Auto-dry for the wick, 2-year warranty
Cons
- Pricey for a 1-gallon unit
- Covers only 219 sq ft
- Lid doesn't screw on
- Short runtime on high
The best pick for light sleepers in a small bedroom. It costs more than its capacity suggests, but it is quiet and easy to clean.
Full Levoit Sprout Evaporative Humidifier (LEH-B381S-WNA) review →Levoit Superior Studio Smart 450S
Pros
- Washable wick rated up to 2 years
- Fast humidity gain in RTINGS early data
- Mid-priced for a 4.5 L top-fill unit
- Smart controls and auto humidity
- 2-year warranty
Cons
- No full independent review yet
- 14-hour runtime in RTINGS data versus 40 hours claimed
- Wick life assumes weekly washing
- Tank material not disclosed
An interesting low-waste option with promising early numbers. Wait for full reviews if you can, or buy it knowing the claims come mostly from Levoit.
Full Levoit Superior Studio Smart 450S review →Both products are part of our guide The Best Evaporative Humidifiers (No White Dust) of 2026, where you can see every pick, how we score and current prices from each retailer.