Levoit OasisMist 450S Smart Humidifier vs DREO HM311S 4L Smart Cool Mist Humidifier
Does the Levoit's listed warm-mist option matter separately from the test's maximum-setting water-use and calculated refill figures?
Products compared
ASIN B0B1DQ8KV3
Levoit OasisMist 450S Smart Humidifier
You specifically want Levoit's manufacturer-listed warm-mist option.
Last observed offer
$75.98
List Price: $89.99
- Confirm offer eligibility on Amazon
Size: 4.5L Humidifier
Price checked
Observed condition: new. Coupon and subscription requirements unverified.
ASIN B0CCVX6FSD
DREO HM311S 4L Smart Cool Mist Humidifier
A cool-mist model fits your needs, and the cited test's longer calculated full-tank interval for DREO at its reported maximum setting suits your refill planning. The comparison does not establish Levoit's rate in warm-mist mode.
Last observed offer
$50.53
- Confirm offer eligibility on Amazon
Size: 4L
Price checked
Observed condition: new. Coupon and subscription requirements unverified.
Prices are per listed package. Pickoryx may earn a commission from qualifying purchases through the paid Amazon links on this page, at no added cost to you.
Published by Pickoryx · Published 2026-10-22 · Source checked 2026-10-22 16:04 UTC
The main trade-off
Levoit lists warm and cool mist. In one independent room test it had the higher reported maximum-setting water-use rate, but the reviewer did not identify whether Levoit was in warm or cool mode. DREO is a cool-mist model, and its longer full-tank interval is calculated from its lower reported rate and 4 L tank; neither interval is an observed tank-emptying time.
Quick verdict
Levoit lists both warm and cool mist. In one independent 194 sq. ft. room test, the reported maximum-setting water-use rates were about 301 mL/h for Levoit and 206 mL/h for DREO; the reviewer did not state whether the Levoit measurement used warm or cool mist. The reported full-tank intervals, about 14.9 and 19.4 hours, were calculated from those rates and tank capacities, not observed in tank-emptying trials.
Choose Levoit OasisMist 450S Smart Humidifier if
- You specifically want Levoit's manufacturer-listed warm-mist option.
- You value the higher maximum-setting rate reported for Levoit in the cited test, while recognizing the reviewer did not identify its warm/cool mode.
Choose DREO HM311S 4L Smart Cool Mist Humidifier if
- A cool-mist model fits your needs, and the cited test's longer calculated full-tank interval for DREO at its reported maximum setting suits your refill planning. The comparison does not establish Levoit's rate in warm-mist mode.
When the recommendation changes
- If warm mist is not a requirement, consider the output and refill estimates separately from mist-mode preference.
- The review does not identify the Levoit's mist mode for its measured rate. Neither calculated interval is an equal-output comparison or a prediction for a particular home.
The differences that matter
| Decision point | Levoit OasisMist 450S Smart Humidifier | DREO HM311S 4L Smart Cool Mist Humidifier |
|---|---|---|
| Mist Mode Fit | Levoit lists warm- and cool-mist settings.[1] | DREO identifies the HM311S as a cool-mist humidifier.[2] |
What this changes: A buyer who specifically wants a warm-mist setting has a documented fit in the Levoit; if cool mist is enough, this feature alone need not decide the purchase.[1, 2] The better fit depends on your priorities | ||
| Output And Refill Context | In the reviewer's 194 sq. ft. test, Levoit's maximum-setting moisture output was reported as about 301 mL/h. The article does not identify whether the humidifier was using warm or cool mist. Using the listed 4.5 L tank capacity, the reviewer calculated about 14.9 hours from that measured rate; this is not a warm-mist-specific runtime.[3, 1] | In the same reviewer's 194 sq. ft. test, DREO's reported maximum-setting moisture output was about 206 mL/h. Using the listed 4 L tank capacity, the reviewer calculated about 19.4 hours from that measured rate. These are calculated, not observed, tank-emptying times.[3, 2] |
What this changes: At the reported maximum settings, the measured water-use rate is higher for Levoit and the calculated full-tank interval is longer for DREO. The calculations use each model's own tank capacity and measured rate, not equal output or humidity targets. The article does not specify the Levoit's warm/cool mode, so its figures cannot support a warm-mist-specific output or refill claim.[3, 1, 2] The better fit depends on your priorities | ||
Best for your routine
A buyer specifically wants the option to switch between warm and cool mist.
Best fit: Levoit OasisMist 450S Smart Humidifier
Based on listed features, not comparative testing.
Levoit's manufacturer page lists both mist settings; the DREO page identifies the HM311S as a cool-mist humidifier.
A buyer prioritizes the cited test's calculated full-tank interval at the models' reported maximum settings, while accepting that the Levoit's tested mist mode was not stated.
Best fit: DREO HM311S 4L Smart Cool Mist Humidifier
The same-room test reports about 206 mL/h and calculates about 19.4 hours from DREO's 4 L tank. It reports about 301 mL/h for Levoit and calculates about 14.9 hours from its 4.5 L tank, but does not identify whether Levoit was tested in warm or cool mode. These figures are calculations from different maximum-setting rates, not equal-output or warm-mist-specific comparisons.
Value and trade-offs
One or both observed offers have eligibility conditions, so no unrestricted price difference is shown.
If one current offer is higher, Levoit's listed warm-mist option may matter to buyers who require it. The test-specific higher maximum rate may matter to others, but the reviewer did not identify the Levoit's mist mode for that measurement; compare current exact-model offers and seller terms.
The available price information does not establish when either model is best to buy. Compare current exact-model offers and seller terms.
Limitations
- The independent test used a 194 sq. ft. room and measured water use over one hour. It did not state whether the Levoit measurement used warm or cool mist. The full-tank intervals were calculated from measured output and listed tank capacity, not observed until each tank emptied.
- The maximum-output measurements and derived refill intervals do not compare the humidifiers at equal output or equal humidity targets; the Levoit's tested mist mode is unknown, and the estimates do not predict results in every room.
- Pickoryx did not test either humidifier hands-on. This comparison addresses mist-mode fit and the cited test's output/refill context, not health effects, safety, noise, or long-term reliability.
Questions shoppers ask
Does the longer DREO runtime mean it is more efficient?
Not from these figures alone. The reviewer measured hourly water use at each model's reported maximum setting and calculated a full-tank interval from rate and tank capacity. DREO's estimate is longer alongside a lower measured rate. The test does not compare equal output or energy use, and it does not identify whether Levoit was in warm or cool mist.
Methodology and sources
Checked manufacturer product pages for the listed mist modes, model names, capacities, and US input. Compared the reviewer's stated same-room measurements, preserving the distinction between measured hourly water use and calculated full-tank runtime.
Automation helped organize the supplied research, verify source references, and draft this comparison. Product statements are attributed to the cited manufacturer or independent test.
View 3 sources
- 1.Levoit OasisMist® 450S Smart Humidifier | Warm & Cool MistLevoit · Official specifications · Source checked 2026-10-22 16:03 UTC
Evidence used on this page
- Product heading and summary; Product Specifications; AC 120V, 60Hz and 4.5 L tank: The product page identifies OasisMist 450S, lists warm and cool mist, top fill, 4.5 L capacity, and US 120V/60Hz input.
- 2.DREO HM311S 4L Smart Cool Mist Humidifier for BedroomDREO · Official specifications · Source checked 2026-10-22 16:03 UTC
Evidence used on this page
- US English product page: HM311S product heading; Specifications; What's in the box: The US English product page identifies HM311S as a 4 L cool-mist model and specifies 120V/60Hz input, app/touch/voice controls, and included manual and cleaning brush.
- 3.Best Humidifiers You Can Buy – Tested & Compared!Air Purifier First · Independent testing · Source checked 2026-10-22 16:03 UTC
Evidence used on this page
- Updated September 29, 2026; testing method and exact-model sections: Levoit OasisMist 450S and DREO HM311S: Milan Antonic says the five models were tested in the same 194 sq. ft. room. The method measures water use over one hour and calculates full-tank runtime. For this pair, the article reports about 301 versus 206 mL/h at the models' maximum settings and calculates about 14.9 versus 19.4 hours using listed tank capacities. It does not state whether the Levoit measurement used warm or cool mist. The calculated runtimes are not observed tank-emptying tests.