Dreo
Dreo HM717S
Eight litres, warm and cool mist and a published 550 mL/hr - on paper the most complete portable in Dreo's line, though the demineralisation cartridge that would stop white dust is a separate purchase: $25.99 for three, or a $145.98 listing that bundles one against $119.99 without. The extra two litres over the HM713S buy about two and a half more hours at full output rather than the twenty the runtime figures suggest, because the 80-hour number is again the lowest setting. Where it genuinely earns the money is the middle: run it on auto in a 400 sq ft bedroom and it will go two or three nights between fills without a chilly mist.
The room-size claim, reconciled
860 sq ft supported · box says 600 sq ft
The 600 sq ft on the box is what the winter load calculation supports for this output — one of 18 units here whose claim lands within 5% of its own published rate.
Holding 600 sq ft takes about 2.44 gal/day, which drains this 2.11-gallon tank in roughly 21 hr — against the 80 hours Dreo advertises, which is measured at the lowest setting.
What a year costs
No cartridge ships with the $119.99 listing. Dreo sells the unit with a demineralisation cartridge as a separate $145.98 listing, or the cartridge alone as a $25.99 three-pack, changed every two months in season. Electricity assumes the rated 300 W for 12 hours a day across a 150-day heating season at 16¢ per kilowatt-hour.
Specifications
Maintenance profile
- Top fill
- Yes
- Replaceable media
- None — nothing to buy
- White dust risk
- Yes — atomises minerals with no demineralisation
Facts, not a score. Which of these matter depends entirely on whether the unit ends up somewhere you will actually clean it.
Features
- 8L top-fill tank
- 550 mL/hr published output
- Warm and cool mist
- Takes a demineralisation cartridge, sold separately
- Humidity sensor and auto mode
- Dreo app and voice control
- 28 dB on low
Pros
- The refill interval at realistic settings is the genuine benefit, and it is large
- Warm mist and a real published output figure, like the HM713S, with two more litres of tank
- At the middle settings the published output and tank size work out to two or three nights between fills in a 400 sq ft room
Cons
- Eight litres is heavy and the unit is large enough to be furniture
- About fifteen hours at the full output, not the 80 advertised
- Warm mode draws 300W, so the cheap-to-run case only holds if you never use the feature you paid for
- New enough that long-term reliability reports are thin
The pros and cons above are drawn from the maker’s documentation and published specifications. There is not yet a body of owner reports for this model that we have read.
What owners say
No owner discussion collected for the Dreo HM717S yet. The pros and cons above come from the maker's documentation and published reviews, and this section will fill in when there is enough first-hand material to summarise honestly. We would rather leave it empty than invent it — how we compare explains why.
Dreo HM717S, head to head
Looked at alongside it
More from Dreo →
Dreo
Dreo HM713S
Dreo publishes 500 mL/hr for this one, which is 3.17 gallons a day and puts it in the same real-output bracket as Levoit's LV600S at a slightly lower price. Like the Levoit, it makes white dust on hard tap water unless you add a demineralisation cartridge, which Dreo sells separately. The 500 sq ft claim is well inside what 3.17 gal/day actually supports - around 780 by the psychrometrics - making this one of the few portable ultrasonics whose room-size number is conservative rather than aspirational. The catch is the same as every hybrid: at the output that justifies the claim, the 6-litre tank is empty in about twelve hours.
781 sq ft supported · box says 500 sq ft
Levoit
Levoit LV600S
One of the few units in the catalog where the maker publishes an actual output rate rather than leaving you to infer it: 550 mL/hr on warm, 300 on cool. That makes the LV600S checkable in a way most of its shelf-mates are not, and the check is unflattering in a useful way. At 550 mL/hr it moves 3.49 gallons a day, which is a genuinely capable figure - enough for around 860 square feet by the psychrometrics - but it empties the 6L tank in about eleven hours. The 50-hour runtime on the box is the cool setting at its lowest. Both numbers are honest; they just describe different machines. Owners who understand that and run it on auto in a bedroom are happy; owners who expected 50 hours of whole-floor humidification are the ones writing the angry reviews.
860 sq ft supported · box says 753 sq ft
Dreo
Dreo HM512S
A litre more tank than the HM311S, from the same playbook: humidity sensor, app, top fill and a 28 dB low setting. Dreo rates it for 300 sq ft, the same room as the smaller unit. That room calls for about 1.2 gallons a day, which would take the 5-litre tank down in roughly 26 hours against the 42 advertised - a modest stretch rather than a wild one. Neither Dreo ships a demineralisation cartridge in the box, and the 512S takes a different one from the 311S, sold as a $25.99 three-pack, so on hard water budget for it from the start. Against the HM311S the extra $20 buys a litre of water and not much else: both have an aroma pad tray, a sensor and the same app.
185 sq ft supported · box says 300 sq ft