Humidifiers · Head-to-head
Blueair InvisibleMist H35i vs Levoit Superior 6000S (LEH-S601S-WUS)
The short answer
Levoit Superior 6000S (LEH-S601S-WUS) comes out ahead overall with 8.1/10 against 7.7/10 for the Blueair InvisibleMist H35i. Blueair InvisibleMist H35i is stronger on value. Levoit Superior 6000S (LEH-S601S-WUS) is stronger on humidifying performance, quiet & sleep-friendly and ease of use. At current verified prices, the Blueair InvisibleMist H35i costs about $100.00 less.
- Choose the Blueair InvisibleMist H35i if: Bedrooms and medium rooms where the humidifier runs all winter and a low running cost matters more than reaching high humidity.
- Choose the Levoit Superior 6000S (LEH-S601S-WUS) if: Open-plan homes and large living areas that want one smart evaporative unit to run for days with no white dust.
Scores by criterion
| Criterion | Blueair InvisibleMist H35i | Levoit Superior 6000S (LEH-S601S-WUS) |
|---|---|---|
| Hygiene & Ease of Cleaning | 8.2Dishwasher-safe tank (Blueair), cleaning rated 5/5 (Bob Vila), and an auto-dry button. | 8.3Evaporative wicks (lowest EPA dispersal type); Bob Vila rated cleaning 5/5; wicks need replacing on schedule. |
| Humidifying Performance | 7.0Plateaued near 51% RH and needed daily refills. | 8.6Held ~50% RH in Bob Vila testing; the 3,000 sq ft and 72 h figures are untested manufacturer claims; single-publisher evidence. |
| Quiet & Sleep-Friendly | 6.5TechGearLab measured 49.6 dB. Sleep mode is very quiet (Bob Vila). | 8.0About 28–45 dB in Bob Vila testing; has a sleep mode. |
| Health, Safety & Materials | 8.0Evaporative with a BPA-free tank. UV and antimicrobial measures are manufacturer claims. | 8.2No white dust or steam burn risk and no CPSC recall found, but tank material and BPA status are undisclosed. |
| Ease of Use | 8.0Top-fill, app control and auto mode. | 8.8Wheels, fill hose, app and auto humidistat; heavy and tall when full. |
| Value | 8.6$149.99 with the lowest measured running cost and $19.99 six-month wicks. | 6.8$249.99 upfront; 30 W draw and tap water keep running costs low; wick 4-pack is $39.99. |
Specifications
| Spec | Blueair InvisibleMist H35i | Levoit Superior 6000S (LEH-S601S-WUS) |
|---|---|---|
| Humidifier type | Evaporative (pump-fed wick) | Evaporative (wick) |
| Water tank material | BPA-free plastic (Blueair) | — |
| Tank capacity | 3.5 L | 22.7 L |
| Max runtime per tank (manufacturer) | 48 hours | 72 hours |
| Rated room coverage | 500 sq ft | 3,000 sq ft |
| Noise (manufacturer-rated or lab-measured) | 49.6 dB | 28 dB |
| Top-fill tank | Yes | — |
| Requires replaceable filter/cartridge | Yes | Yes |
| Built-in humidistat / auto mode | Yes | Yes |
| Built-in night light | No | No |
| Built-in white-noise / sound machine | No | No |
| Dishwasher-safe water-contact parts | Yes | — |
| Mist temperature | Cool (invisible vapor) | Cool (evaporative) |
| 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; tap water OK per Levoit) |
| Wick replacement interval / cost | Every 6 months; $19.99 (Blueair) | 4 wicks; 4-pack $39.99 (Levoit); owner replaced every 3–6 months depending on buildup (The Gadgeteer) |
| Antimicrobial / UV measures | UV-integrated pump; antimicrobial wick (manufacturer claims) | Dry Mode dries wicks to limit mold (Levoit) |
| Warranty | 1 years | 2 years |
Blueair InvisibleMist H35i
Pros
- Lowest measured operating cost in TechGearLab's test
- Dishwasher-safe, BPA-free tank
- Top-fill design with smart controls
- Inexpensive wicks every 6 months
- Warranty extends to 3 years with registration
Cons
- Plateaued near 51% RH in lab testing
- Bob Vila's testers refilled it daily to hold about 45% RH
- 49.6 dB constant fan noise
- Blueair also sells an H35i G2, so check the model before buying
A smart, low-cost choice for a bedroom or medium room where the humidifier runs all winter. Expect modest humidity gains and audible fan noise, in exchange for easy cleaning and cheap running costs.
Full Blueair InvisibleMist H35i review →Levoit Superior 6000S (LEH-S601S-WUS)
Pros
- Largest tank in the group, with hose refill and wheels
- Held target humidity without dampness in testing
- Quiet range of about 28 to 45 dB
- Low 30 W power draw
- Works with tap water and avoids white dust
- Smart app control and auto mode
Cons
- Expensive upfront
- Tall (26.8 in) and heavy when full
- Replacement wicks add running cost
- Independent testing comes from a single publisher
The best option for open-plan homes and big living areas. It costs the most of the evaporative picks, but low refill frequency, easy cleaning and low energy use justify it for large spaces.
Full Levoit Superior 6000S (LEH-S601S-WUS) 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.