Why it matters
The Blueair H38i Humidifier is an evaporative humidifier with a 3.8 liters tank, rated for 596 square feet.
Run time per fill, per the maker: 48 hours.
Aim for 40 to 60 percent relative humidity indoors: drier air irritates airways and skin, wetter air feeds dust mites and mold. Evaporative wicks trap the minerals instead of releasing them, so tap water is fine, but the wick stiffens and needs replacing.
The listing names a top-fill tank.
Top-fill tanks are filled from above without carrying the tank to a sink, which also makes them easier to wipe out.
A full tank holds about 3.8 liters, which adds roughly 8 pounds of water to carry or lift (filled in place from the top).
Spread over 48 hours, that tank works out to about 79 milliliters an hour, the rate on the setting the run time was measured at; higher settings empty it faster.
Its tank of 3.8 liters is below the middle of the range we cover: 32 of the 78 humidifiers with a stated figure come in lower, and the range runs from 0.7 liters to 20.1 liters.
Its stated run time of 48 hours is above the middle of the range we cover: 43 of the 69 humidifiers with a stated figure come in lower, and the range runs from 10 hours to 130 hours.
Price-wise it sat in the cheapest third of the 22 evaporative models we cover when we checked; the button shows today's price.
It qualifies for our lists Best Humidifiers for Large Rooms, Best Cool Mist Humidifiers, Best Evaporative Humidifiers, where it is ranked against every model that meets the same rule.
Compared with the Blueair InvisibleMist Humidifier: rated room size 596 square feet here vs 500 sq ft; run time 48 hours here vs up to 48 hours.
Who it's for, and who should skip it
Good fit if
- Large living rooms and open plans
- Owners who will clean it weekly
Look elsewhere if
- Rooms far larger than its rating
Pros and cons
Pros
- 3.8 liters tank
- Runs 48 hours per fill
- Rated for 596 square feet
Cons
- Needs regular cleaning to stay hygienic
Limitations to weigh
- Not stated on the Blueair H38i Humidifier listing: power draw. Ask the seller or check the manual before relying on it.
Specifications
The bracket shows where each figure comes from.
| Model number | 113360 | Retailer |
|---|---|---|
| Room coverage | 596 square feet | Retailer |
| Noise (seller) | 20 dBA | Retailer |
| Filter type | Wick | Retailer |
| Capacity | 3.8 liters | Retailer |
| Run time per fill | 48 hours | Retailer |
Alternatives worth comparing
More room humidifiers we cover
- Stadler Form O-040A Humidifier
- Levoit Classic 160 Humidifier
- Pure Enrichment PureBaby Humidifier
- MEGAWISE SK7620 Humidifier
- Levoit OasisMist 450S Smart Humidifier $79.99
All room humidifiers, compared in one table · Every Blueair product we cover
Final verdict
A sensible choice for large living rooms and open plans. Confirm the model it fits before ordering.
Where to buy
Each button opens this exact model. We may earn a commission on tracked links; it never changes what we publish. Disclosure