It did not go away

Boneco’s own store sells the W200 today at CHF 229.90. The Air Washer line around it is current too, running from the W200 up through the W220, W300 and W400 SMART. One review site says the W300 replaced this model. The W300 is the one showing as sold out.

In the United States the picture is thinner but real. Home Depot had it at $269.99 and a vacuum specialist had it at $249.99. Walmart, Bed Bath and OfficeSupply were all out of stock, Best Buy says the item is no longer available in new condition, and three allergy retailers who used to carry it now return a dead page. Sylvane has dropped the brand entirely.

One more thing worth knowing if you own one. Boneco’s US website is broken. The manual tells owners to go to www.boneco.us for support, and that address returns a 404. The shop subdomain does not resolve at all.

What an air washer is

There is no filter cartridge in the usual sense. A stack of textured discs turns slowly through a tray of water, the wet surface picks up whatever the fan blows across it, and the water holds onto it. Boneco puts it this way: the discs turn in the water, “which acts as a natural filter, which washes the air of impurities (e.g. dust, pollen and particle-bound odours).”

That design keeps the running costs down, because your consumable is mostly tap water and there is no $40 cartridge to buy every year. It also puts a hard ceiling on what the machine can remove. A wet surface grabs whatever is heavy enough to hit it and misses whatever is light enough to sail past.

What the water does not catch

Consumer Reports ran the Venta Airwasher through its standard air purifier test in 2008. The Venta is the same idea as the W200, a disc stack turning in a water tray, sold on the same promise. Both models “proved no better at removing dust and smoke than no air purifier at all,” and the claim about capturing particles down to 10 microns was, in their phrasing, a nonstarter.

Consumer Reports tested a competitor, so that is evidence about the mechanism rather than about this particular Boneco. It came from a lab with no product to sell, which makes it the closest thing to independent evidence the category has.

The EPA’s home air cleaner guide points the same way by omission. It explains clean air delivery rate, covers HEPA and covers MERV ratings. Water-washing devices are absent from it, which puts them outside the category rather than at the bottom of it.

AHAM certifies clean air delivery rate for portable air cleaners, and its directory is the reference every serious purifier gets measured against. I read both editions, the April 2020 one and the October 2023 one, looking for Boneco and for Plaston, the Swiss parent. Neither brand is in either. Home Depot’s own filter for AHAM-certified Boneco products returns nothing at all.

A water-based machine having no CADR may be perfectly legitimate, because the test was not designed for it. The consequence for a buyer is the same either way. Nobody has published a verified figure for how much air this thing cleans.

The tank runs out before the day does

Boneco advertises 2.2 gallons a day of moisture output and a 1.2 gallon tank. Divide one by the other and the tank empties in a little under thirteen hours.

Home Depot lists the output as 1.9 gallons a day, which is the figure you get by working backwards from its own claim of fifteen hours per tank. The manual it hosts on its own servers says 2.2. So the retailer and the manufacturer disagree, using a document one of them is publishing for the other.

Owners notice. The Home Depot reviews include “tank isn’t super large, so I do have to refill every day” and, from someone running it harder, “refill a couple times a day.”

Boneco’s two noise figures

The product page says 27 to 43 dB(A). The US manual says level one is 32 dB(A) and level two is 46. Those are the same machine described by the same company, and the marketing version is quieter at both ends.

The dealers split on it. OfficeSupply and Bed Bath copy the manual and print 32 and 46. One vacuum retailer prints the European 27 to 43 numbers on a unit its own page describes as 110 volt, which cannot be right, because the European figures are measured at 230 volts.

Whichever set you believe, the product is sold under the name Whisper-Quiet, and the one-star Home Depot review says “the unit sounded like a freight train. It wasn’t usable in a bed room.”

What it costs to keep running

The consumables are genuinely cheap. An Ionic Silver Stick is CHF 29.90 and Boneco says to change it every season. The evaporator mat is CHF 24.90 and lasts two years. Descaler is CHF 9.90. Call it forty francs a year, which is a fraction of what a HEPA machine costs to feed.

Your labour costs more. The manual asks you to clean the water base, the drum and the mat every two weeks, clean the fan and the inner area once a year, and empty and refill after any three days sitting idle. Skip that on a machine whose entire operating principle is standing water and you will find out why the schedule exists.

What bothers me is the US manual. It says nothing about mould or bacteria, gives no descaling procedure, and never states how often the Ionic Silver Stick needs replacing. All of that is on the Swiss website, and the manual sends you to a US address that no longer exists. Consumer Reports tested humidifiers making antimicrobial claims in 2016 and found that most of them “harbor bacteria in the reservoir tank and many have the potential to emit that bacteria into the air,” singling out ionic silver by name. Boneco sells the Ionic Silver Stick on exactly that claim. No independent test of it exists that I could find.

What is wrong with it

Questions people ask

The room-size and filter-cost tables for every machine in this cluster sit together on the air care hub.

Read how I check numbers.