DREO 717S Humidifier Review: 8L Tank, Top-Fill and 80 Hours

An 8-liter (2.1 gallon) top-fill tank, warm and cool mist, and up to 80 hours on low cool mist — without flipping a dripping tank over the sink.

By Jeremy Moon · Reviewed 2026 · Tested at home

https://www.youtube.com/watch?v=wCEwEBNLZ7Y

If you live in a dry climate like I do here in Colorado, or you run the heater all winter, you already know the signs: crispy house plants, gaps opening in the hardwood, air that feels too dry to sleep in. The usual humidifier trade-offs are just as familiar. Tiny tanks that need a refill every night. Mist that dumps onto the nightstand. Built-in humidity readings that miss the mark by a wide margin.

The DREO Smart Humidifier 717S (HM717S) is aimed at those frustrations. DREO lists an 8-liter (about 2.1 gallon) tank, up to 80 hours on low cool mist, warm and cool mist, app/touch/voice control, and coverage up to 600 square feet. I tested it at home for the sponsored video below; this write-up expands on what I found.

I also cut a Short that walks through the tank, runtime claim and top-fill design in under a minute: DREO 717S Short.

What it is

Out of the box it looks more like a modern appliance than medical gear. DREO lists about 12.01 × 6.73 × 14.45 inches and 6.93 lb; in the video I called it roughly 12 × 6.7 inches at the base and just under 14.5 inches tall, silver and black, without dominating the room.

The headline is the tank. Eight liters is a lot for a consumer humidifier, and DREO ties it to up to 80 hours on low cool mist. Higher mist and warm mist use water faster — DREO's FAQ says the same — so buy it for fewer refills, not for the marketing maximum on every setting.

DREO also rates maximum mist output at 550 ml/h, noise at 28 dB on the lowest setting, and applicable area at 600 sq. ft. In the review I noted cool mist maxing at 300 ml/h; DREO's published product-page max is the 550 ml/h warm-high figure.

Setup and filling

Refilling is the part most humidifiers get wrong. On the 717S the tank is top-fill: pop the lid and pour. You are not hauling a heavy, dripping tank upside down to the sink. The opening is wide, and the unit comes apart in a modular way that makes wiping scale and cleaning the interior much less of a fight than on tanks with awkward necks.

DREO's box list (from their product page) includes the humidifier, user manual, quick start guide, cleaning guide, a cleaning brush, and three aroma pads (two pre-installed). Compatible demineralization cartridges are optional extras; do not assume the base box includes a cartridge bundle.

Place it on a flat, level surface with room to refill from above. DREO's FAQ warns against sitting the unit directly on carpet (it can clog the air inlet) and against running it in a room already over about 60% relative humidity if you are seeing leaks or excess moisture.

Mist output, warm vs cool, and runtime

A giant tank does not help if the mist just dumps onto the floor. DREO uses what they call MistWave atomization. On high warm mist, output hits DREO's published 550 ml/h. Cool mist, in my rundown, tops out at 300 ml/h.

DREO rates the mist plume at 40 inches. I put a tape measure on it. Mist comes from a wide, roughly 4-inch nozzle with a 30-degree tilt. DREO cites ultra-fine particles around 5 microns; in practice the plume launched over three feet high and suspended instead of pooling on furniture. Coverage is rated up to 600 square feet.

The hybrid ultrasonic plus PTC system is what makes this year-round for me: cool mist (blue status lighting in the demo) for warmer months and plants, warm mist (warmer red lighting) for dry winter throats and sinuses. I timed the heater to about 133°F in just under eight minutes. Warm mist has three levels I called out in the video — 113°F, 122°F and 131°F — while DREO's FAQ describes about 113°F to 130°F and recommends 5–10 minutes to heat. In a 20-minute test in my room, humidity rose by 19 percentage points.

Runtime again: DREO's up-to-80-hours claim is low cool mist only. Warm mist and higher output empty the tank faster, especially in a cold, dry house.

Controls, app and humidity targeting

One of my biggest frustrations with standard humidifiers is a built-in sensor that overshoots until windows fog — I have seen misses of 10–20%. DREO rates the 717S humidistat to within ±5%. Against an independent hygrometer a few feet away, the reading stayed in step. That is one meter in one room, not a lab calibration.

A three-color indicator gives a quick visual: yellow for dry (about 30% or below), green for comfortable (about 31–60%), blue for too humid (above about 61%). Auto mode lets you set a target from 30% to 90% and holds that range.

In the DREO app I monitored real-time humidity, set schedules and checked filter status. Alexa on/off worked in my demo; I also noted Google Home and Siri support. Touch controls cover day-to-day changes without the phone. The translucent body shows customizable RGB (the demo cites over 1,500 colors), or you can shut the lights off entirely for bedtime — that off switch matters as much as mist level for overnight use.

Noise and real-world use

If it sits on a nightstand or in a home office, noise is make-or-break. DREO rates 28 dB on the lowest setting. On low cool mist I found it virtually silent, without the gurgling a lot of ultrasonics make. Even bumped up, airflow stayed smooth enough for overnight use in my house. In the video I ran the highest warm setting and shuffled book pages beside it so you can hear the comparison yourself. Quiet on low is not silent on max.

Watch condensation the same as with any capable humidifier. If windows or the cabinet get wet, turn mist down or off — DREO's FAQ says the same. More humidity is not automatically better.

Cleaning and maintenance

The wide top opening and modular disassembly are the cleaning story — wiping scale is far easier than on narrow-neck tanks. DREO includes a cleaning brush and cleaning guide.

Water choice still matters. DREO recommends purified or distilled water; mineral-heavy tap water is a common source of white dust on ultrasonics. The 717S is compatible with DREO's optional demineralization cartridge (ion-exchange resin); I noted about 40 gallons per cartridge with app replacement reminders. Cartridges are not in the standard box. A slide-out aroma pad tray at the base takes a few drops of essential oil; the box includes pads — replace them if you use oils and clean the tray with the rest of the unit.

Specs at a glance

Tank 8L (≈2.1 gal), top-fill — DREO

Runtime claim Up to 80 hours on low cool mist — DREO

Max mist 550 ml/h — DREO (warm high in my review)

Noise claim 28 dB lowest setting — DREO

Coverage claim Up to 600 sq. ft. — DREO

Size / weight 12.01″D × 6.73″W × 14.45″H; 6.93 lb — DREO

Controls App, touch, voice (Alexa / Google / Siri noted in review)

Mist modes Cool and warm (PTC); warm levels described in video as 113 / 122 / 131°F

What I liked

✦  Top-fill 8L tank. Refilling is pour-from-above instead of a dripping carry to the sink.

✦  Warm and cool mist in one unit. Year-round use without buying a second humidifier.

✦  Auto humidity targeting. 30–90% target with a humidistat that tracked my nearby hygrometer in testing.

✦  Quiet on low. Usable overnight in my house; DREO's 28 dB low-setting claim matches how it sounded to me on low cool mist.

✦  App, schedules and voice on/off. Alexa on/off worked in my demo; lights can shut off for bed.

✦  Cleaning access. Wide opening and modular parts make upkeep realistic, not theoretical.

What I would keep in mind

✦  The 80-hour figure is a low-cool-mist maximum. Warm mist and higher output empty the tank faster.

✦  Water choice and cleaning still matter. Distilled or purified water reduces white dust; cartridges are optional extras.

✦  It needs floor space and a level surface. Plan for refill access, not just capacity. Avoid carpet under the inlet.

✦  Watch condensation. If windows or the cabinet around it get wet, turn mist down or off.

✦  Price moves. DREO's store listed the Smart Humidifier 717S 8L at $119.99 USD when checked for the companion write-up on Nov 7, 2026 (Mountain time) and again showed $119.99 on the product page when rechecked Nov 9, 2026. That is a listed price, not a verified discount or a promise it stays there.

Who it is for

Buy the 717S if you want fewer refills, both mist temperatures, and app-based humidity control in a medium-to-large room — especially in a dry climate or a house that runs heat hard in winter. Skip the extras-heavy pitch if you only need a small occasional mister for a closet-sized space; then tank size, cleaning routine and footprint may matter more than warm mist and voice control.

FAQ

Does it really run 80 hours?

DREO rates up to 80 hours on low cool mist only. Higher output and warm mist use water faster — plan on more fills in a dry winter house if you run it hard.

Is the humidity reading accurate?

DREO rates ±5%. Against a nearby independent hygrometer, mine stayed in step. Room corners can still differ.

How loud is it?

DREO rates 28 dB on low. On low cool mist I found it sleep-usable and free of gurgling; the highest warm setting is louder but still usable for me.

Does it include a demineralization cartridge?

No — optional add-on. The app can remind you to replace one if you use it.

Warm or cool mist?

Cool for everyday and warmer months; warm for winter dry throat and sinuses. I timed the heater to about 133°F in just under eight minutes — give it several minutes before judging warm output.

Should you buy the DREO 717S?

Yes, if a large top-fill tank, both mist types and app humidity control solve real frustrations with your current humidifier. What sold me: fewer trips to the sink, a humidity target that held in my room, warm mist for winter air, and lights that can go fully dark at night.

Check the DREO 717S: DREO Smart Humidifier HM717S. Written companion on Skimwire: DREO 717S humidifier video review.