Boneco
Boneco U350
No longer sold by Boneco in the US Boneco's US site (boneco.us) now redirects to a page that does not exist, and its only store is a Swiss one selling 230-volt units in francs (October 2026). Shown for comparison; the figures here are for the US model as it was sold.
Swiss, expensive, and unusually straight about what it does: 3.17 gallons a day published, against a 650 sq ft claim that the load calculation puts at 780. A maker printing a number 17% below what its own output supports is doing something almost nobody else in this catalog does. It pairs a demineralisation cartridge with an Ionic Silver Stick for the water, so the two failure modes of a cheap ultrasonic - dust on the furniture, life in the tank - both have a specific countermeasure. The tank is only 5 litres, which at full output is about ten hours.
The room-size claim, reconciled
781 sq ft supported · box says 650 sq ft
The 650 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 650 sq ft takes about 2.64 gal/day, which drains this 1.32-gallon tank in roughly 12 hr.
What a year costs
Boneco's A250 demineralisation cartridge runs about $20 and lasts two to three months in hard water. Electricity assumes the rated 300 W for 12 hours a day across a 150-day heating season at 16¢ per kilowatt-hour.
Specifications
A claim the maker makes
Boneco says the included Ionic Silver Stick uses silver's antibacterial effect to keep the water clean. We quote it rather than repeat it: this site has not tested it and neither has anyone independent.
Maintenance profile
- Top fill
- Yes
- Replaceable media
- Demineralisation cartridge
Facts, not a score. Which of these matter depends entirely on whether the unit ends up somewhere you will actually clean it.
Features
- 3.17 gal/day published output against a conservative 650 sq ft claim
- Warm or cool mist
- A250 demineralisation cartridge
- Ionic Silver Stick water treatment
- Top-fill 5L tank
- Digital humidistat with auto mode
- Cleaning reminder
Pros
- One of only a handful of units here whose published room size is smaller than its own output would justify
- Demineralisation cartridge and silver stick address dust and tank biology separately rather than pretending one solves both
- Warm mist option and a genuine 3+ gallons a day in a top-fill tabletop unit
Cons
- Ten hours per tank at full output - the capability is there, the water is not
- Cartridges at roughly $20 every two to three months
- 300W with warm mist engaged - the setting rather than the unit decides the electricity bill
- $230 is a lot next to a Dreo HM713S that publishes the same output
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 Boneco U350 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.
Boneco U350, head to head
Looked at alongside it
More from Boneco →
Four gallons a day from a tabletop unit, which puts the U700 level with Vornado's Evap40 console on output while taking up a fraction of the floor. Its 1,000 sq ft figure lands within two percent of the load calculation - Boneco and Vornado both print numbers the physics backs up. Its nine-litre tank still lasts only fourteen hours at full tilt, which is the recurring lesson of this category: capability and refill interval trade against each other and no amount of marketing changes it. The self-cleaning mode is genuinely unusual at any price.
985 sq ft supported · box says 1,000 sq ft
An air washer works by turning textured evaporator mats through a water bath: air passes over the wet surfaces, picks up moisture, and drops some dust on the way. The appeal is that the mats are washed rather than bought by the season - Boneco says they go in the dishwasher or the washing machine - though it does sell replacement mats. Boneco's technical data gives 350 grams an hour, which is 2.22 gallons a day and supports about 547 sq ft, so the 540 on the listing is one of the few coverage claims in this catalog that its own maker's output figure actually backs. The rest of the arithmetic is as plain: a 4.5-litre bath, one silver stick a year, no filters, and about thirteen hours between fills if you are running it at the room it claims.
547 sq ft supported · box says 540 sq ft
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