The most output you can buy under $150

The EVDC300's larger sibling: same DC motor and single-watt idle, two tanks instead of one, and enough output to matter in a real living room. At 3.5 gallons a day it is the most capable tabletop Vornado makes, and its 840 sq ft figure again sits within a few percent of the load calculation. Fourteen hours at full output, so still a daily job in a dry house - but two tanks make that a lighter job than one. The question it poses against the Evap40 console is whether you would rather carry water twice a day and keep the floor space, or once a day and give up a corner.

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.

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.

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.

Two tanks instead of one, two wicks instead of one, and 2.4 gallons a day against a 580 sq ft claim - within about two percent of the load calculation, one of several Vornado figures that land that close. Refilling means carrying two 0.75-gallon tanks rather than one heavy one, which sounds like a downgrade and is not: most people find two light trips easier than one awkward one, and you can run it on a single tank overnight. Fifteen hours at full output is the honest tank life, and Vornado does not pretend otherwise.

A DC motor is the only interesting thing here and it is interesting enough to justify the model. On its Energy Smart setting the EVDC300 draws as little as a single watt, against the fourteen to forty-five watts Vornado's AC evaporatives pull, and it runs the whole winter for the price of a few coffees. Output is 2.3 gallons a day - within one percent of what its 560 sq ft claim actually needs - from a one-gallon tank, which is the catch: ten hours between fills if you run it hard. It is the fill interval, not the capability, that decides whether this or the two-tank EV200 is the right one.

The long-running default in this category, and the arithmetic explains why. Honeywell's manual gives 2 gallons a day of output against the 500 sq ft it is sold for - a room that needs almost exactly that - making this one of the few portables in the catalog whose coverage number the physics supports outright. It was sold from 2011 largely unchanged until Honeywell discontinued it; the tank and tray go in the dishwasher, and it evaporates rather than atomises, so there is no white dust. The costs are a wick habit, a fan you can hear, and no humidistat at all: three speeds, and you are the humidistat.

Honeywell's answer to the two complaints levelled at the HCM-350: no digital humidistat, and a tank you have to carry upside down to the sink. The HEV620 is a tower with a top-fill opening, a digital humidistat that will actually hold a target, and a timer. Its 300 sq ft claim against 2 gallons a day of output is one of the most conservative ratios in the catalog - the output supports closer to 490 - which is worth knowing if you have been talked out of it by a spec-sheet comparison against an ultrasonic promising 750. Honeywell now sells it in black (HEV620B); the white HEV620W pictured is discontinued.

A boiler with a tank on it, and the oldest idea in the category. Steam humidifiers have no ultrasonic disc to scale, no wick to replace and no fan to hear - the water boils, minerals stay in the pot, and what leaves the machine is distilled by definition. That is why the V745A shows up in so many nursery and sick-room recommendations despite being unchanged for well over a decade. It is also 260 watts of a hot electrode boiling water in a room with a child in it, twelve hours to a tank, and an appliance you descale rather than rinse. The 250 sq ft on the box is the most conservative figure Vicks publishes; two gallons a day would hold nearly twice that.

Sold on being easy to clean - a wide 3.5-litre tank you can get a whole hand into, which is a bigger deal than it sounds given that the narrow-necked tank is why most cheap humidifiers end up growing something. Pure Enrichment publishes its output as well as its runtime: up to 300 mL an hour, which is 1.9 gallons a day, twelve hours to a tank on high and fifty on low. That supports about 470 square feet, almost exactly the 475 it prints in its copy, though the spec table on the same page says 270. What you give up for the wide mouth is a sensor: there is no humidistat, so it runs at the level you set until it is empty, and in a small closed room that is how windows end up wet.

The cheap one, and honest about being cheap. No humidity sensor, no app, no auto mode - a dial, a 2.5-litre tank, a filter sponge and a top-fill opening. For a small bedroom or a desk that is often exactly enough, and the absence of a sensor means there is nothing to drift out of calibration. It is also, unexpectedly, one of the more truthful boxes here: Levoit publishes 190 mL/h at the top of the dial, which is about 1.2 gallons a day and enough for nearly 300 square feet, more than the 219 its own manual claims. The catch is that Levoit's two runtime numbers describe opposite ends of that dial - 25 hours at the 100 mL/h minimum, 11 at the top. What it cannot do is hold a target: it runs at whatever you set until the tank is empty, which in a small closed room means over-humidifying and a damp window.

Honeywell's filter-free line exists because plenty of people would rather buy no consumables than buy the right ones. There is no wick and nothing to replace, which keeps ownership about as cheap as it gets here - and it is an ultrasonic with no demineralisation media, so on hard water the minerals that a wick would have caught end up on the furniture instead. A gallon tank and 24 hours works out to about a gallon a day, near enough to what its 300 sq ft claim needs, making this one of the more honest small ultrasonics on that particular number.

Where the VUL545 atomises, this one evaporates - a wick, a fan and a UV lamp in the reservoir. For anyone who bought a Vicks ultrasonic and then found white powder on the dresser, the V3900 is the same brand's answer, and it is the cheaper half of the answer compared with Honeywell's HCM-350. A gallon a day against a 400 sq ft claim overstates by about 60%, which is mild by the standards of this category. The wick is the ongoing cost, at roughly $14 every month or two, and the UV lamp treats the water in the tank rather than the air in the room.

Vornado prints room sizes that the physics actually backs up. One gallon a day supports about 246 square feet by the standard winter calculation; Vornado prints 260 on the box. That is not a rounding coincidence - the same relationship holds across their whole line, which means somebody there is doing the load calculation instead of the marketing. The EV100 itself is a plain, small, well-built evaporative: one gallon, one wick, automatic humidity control, and a five-year guarantee that is unusually long for the money. It will not humidify an open-plan floor, and Vornado does not claim it will.

The teardrop shape has been on nursery shelves for over a decade and is probably the most recognisable humidifier in America. A gallon of water, twenty-four hours and no filter required, though Crane sells an optional demineralisation filter (HS-1932) that screws into the tank for hard water. Crane is inconsistent about what it covers: 500 sq ft on its own product page and on retail listings, 250 in its manual. The arithmetic supports the smaller figure: a gallon over 24 hours is about 246 square feet.

Crane's fix for the original Drop's two real problems - the bottom-fill tank and the neck you could not get a hand into - plus a sound machine and a colour-changing nightlight aimed squarely at nurseries. The top opening is wide enough to reach inside and scrub, which is the single most useful change and the reason to pay $5 more. Three sleep sounds, an aroma tray for vapour pads, and the same one-gallon, twenty-four-hour, no-filter arrangement underneath.

Pure Enrichment is unusually straight about runtime: it publishes a range, ten to twenty-four hours depending on the setting, rather than quoting only the flattering end. That one editorial choice tells you more about the machine than any spec - at the high setting a gallon lasts ten hours, which is what a gallon does. It is otherwise an unremarkable and perfectly competent $60 ultrasonic: no filter required, a mist dial, an optional nightlight, auto shut-off. The 500 sq ft claim holds only at the high setting, ten hours to a tank.

Vicks declines to put a square-foot number on this one, describing it only as a medium-room unit - which, given how the rest of the category behaves, is its own kind of honesty. A 4.5-litre tank running 30 hours works out to just under a gallon a day, the same ballpark as everything else at this price. Dual scent-pad slots, a variable output dial, no filter. The usual ultrasonic caveats apply and the tank neck is narrow enough that cleaning it properly means a bottle brush.

Fifty dollars buys the parts that usually cost more: a 4-litre top-fill tank, a real humidity sensor, app control and a 28 dB low setting. The demineralisation cartridge is the part to read carefully. The HM311S takes one, but the $49.99 listing does not include it - Dreo sells it as an $18.99 three-pack or in a $54.99 bundle - and without it the unit atomises whatever minerals are in the tap water, like any other ultrasonic. On the 300 sq ft Dreo prints, the arithmetic is tight rather than wrong: that room wants about 1.2 gallons a day, which would drain the tank in about 21 hours rather than the 32 advertised.

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.

Sold through West Elm and QVC rather than a hardware aisle, which tells you what it is optimised for - a slim tower in a walnut-and-white finish that looks like a speaker. Despite the "Hybrid" in its name it is a cool-mist ultrasonic with no heater - Objecto's own spec reads "Ultrasonic, Cool Mist" - and while the four mist levels are real, a 2.4-litre tank is the smallest of anything here claiming 650 square feet, and twenty-two hours of runtime from it works out to under 0.7 gallons a day. Holding the room it claims would empty the tank in under six hours. Buy it because you want that object on that table; the arithmetic is not the reason.

Take the HCM-350's mechanism and move the fill to the top: water goes in through a funnel on the lid, so nothing has to be carried to the sink, and that is most of what "Easy to Care" means. The trade is capacity: a 1-gallon tank against the 350's 1.1, no UV, and no humidistat here either. Neither Honeywell's manual nor its store page says any part is dishwasher safe, unlike the HCM-350, whose tank and tray are. At the 36 hours Honeywell claims it is moving two thirds of a gallon a day, which is a bedroom's worth; the 360 sq ft it is sold for would take closer to 1.5 gallons a day and drain the tank in about 16 hours.

Vicks sells more humidifiers through drugstore shelves than most of this catalog sells anywhere, and the VUL545 is the one people pick up at nine in the evening when a child has croup. It works: a gallon of water, visible cool mist, a scent pad slot for menthol, and no filter to have forgotten to buy. What it will not do is hold 400 square feet - that room wants about 1.6 gallons a day, about two and a half times what the advertised 36-hour run delivers - and on hard water it powders dark surfaces within a few days.

Sixty hours of runtime and 505 square feet cannot both be true at once, and the Classic 300S is the clearest illustration of that in the whole catalog. Drain a 6-litre tank over the advertised 60 hours and the unit is putting out about 0.63 gallons a day, which is bedroom-sized. Hold 505 square feet at 40% and it needs roughly 2 gallons a day, which empties that same tank in under 19 hours. Both numbers come off Levoit's own spec sheet; only the setting changes. What you actually get for $80 is a competent, genuinely quiet ultrasonic for one room, with top filling, a real humidity sensor, an auto mode that targets 40-50%, and app control that owners either use constantly or never touch again. It is an ultrasonic with no demineralisation media, so hard tap water becomes white dust on the nightstand, and the tank wants weekly cleaning or it turns pink.

Adding a heater to an ultrasonic buys two things: mist that does not feel cold on the skin, and a water path that runs hot enough to discourage what grows in a tank. It costs a 280W draw against the Classic 300S's 26, which is the difference between a rounding error on the power bill and a space heater you left on. The 450S is the counter-top size in Levoit's line - a 4.5-litre tank on a footprint small enough for a nightstand, quieter on its lowest setting than almost anything else here at 26 dB. It claims 430 square feet; the arithmetic says holding that room takes about 1.75 gallons a day, so the tank would last around 16 hours rather than the advertised 45.

A tower with a 1.47-gallon tank, a demineralisation cartridge in the box, and a 426 sq ft claim - an oddly specific number that at least suggests somebody calculated rather than rounded up to 500. HoMedics now lists it as the Decor Series Large Humidifier, and its box gives the CMTF91 a 17-18 dBA noise figure, which with the cartridge makes it one of the quiet, dust-free units here. Seventy hours on the lowest setting is among the longest here, which as usual means the lowest setting moves very little water: about half a gallon a day. Where it earns its place is the combination of a demineralisation cartridge and a real humidistat at $100, which most rivals at this price do not offer.