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TL;DR - The Mistairhome WL-SM02H (PLUS) holds 5025 mL and mists 268 mL per hour or 121.1 mL per hour, which is 18.8 hours and 41.5 hours per fill; it covers 71 sq m (759 sq ft) at a 2.6 m ceiling and measures 30.0 dB on the high step and 27.0 dB on the sleep step; it draws 15.2 W and takes its supply from Mains adapter, 100-240 V, regional plug supplied; the humidistat holds target band 30 to 85 percent in 1 percent steps, held within 3 percent over Wi-Fi 2.4 GHz plus a wired sensor header for a remote probe, and the voice path is Amazon Alexa and Google Home for target changes and on off; no internal cell on this build; it weighs 1871 g and measures 27.4 x 27.4 x 46.8 cm, and ships documented to CE / RoHS / FCC standards for import into South Korea. MOQ is 200 units per SKU with a 25-35-day lead time, FOB Shenzhen or EXW Longgang.
China Wanlin supplies the Smart Humidifier with Humidistat and Target Humidity Setting category as a direct manufacturer, not as a trading intermediary. The unit described below is one configuration out of 24 combinations (8 chassis x 3 SKU builds) that share a common misting family, a common tank and seal line and a common documentation set, so a distributor can build a coherent shelf from one source rather than stitching together unrelated suppliers. Every unit referenced on this page corresponds to a specific bill of materials held on file, so the figures below can be reproduced or independently verified at sample stage.
Full specification of WL-SM02H-PLUS:
| Misting method | Ultrasonic piezo disc bank at 1.7 MHz feeding a wide-throw outlet collar |
| Tank capacity | 5025 mL |
| Mist output on the high step | 268 mL per hour |
| Mist output on the low step | 121.1 mL per hour |
| Run time per fill on the high step | 18.8 hours |
| Run time per fill on the low step | 41.5 hours |
| Coverage area | 71 sq m (759 sq ft) at a 2.6 m ceiling |
| Noise at 1 m on the high step | 30.0 dB |
| Noise at 1 m on the sleep step | 27.0 dB |
| Water type | Tap water or distilled; the tank is sized for a full night plus a working day |
| Mineral dust handling | Cartridge bay in the tank neck, two cartridges included on the Plus build |
| Fill method | Top fill from a jug, with a level window readable from standing height |
| Battery pack | Not fitted, runs from the USB-C supply |
| Cordless run time | Not applicable, mains or USB powered |
| Charge time | Not applicable, no internal cell |
| Power input | Mains adapter, 100-240 V, regional plug supplied |
| Rated power on the high step | 15.2 W |
| Network link | Wi-Fi 2.4 GHz plus a wired sensor header for a remote probe |
| App platform | Dashboard view for multi-room installs, exportable CSV humidity log |
| Voice assistant support | Amazon Alexa and Google Home for target changes and on off |
| Humidistat range and accuracy | target band 30 to 85 percent in 1 percent steps, held within 3 percent |
| Control interface | Capacitive panel with target humidity, four mist steps and a child lock |
| Night light | White status bar readable from a doorway, dimmable to off |
| Protection | Dry-run shut-off, tilt switch, overfill overflow channel, sensor fault alert |
| Scheduling | Seven day schedule with six events per day and a holiday hold mode |
| Dimensions | 27.4 x 27.4 x 46.8 cm |
| Weight | 1871 g |
| Warranty | 24 months |
Shipping configuration: Plus build, + hard carry case + wick and cartridge starter set + gift box + funnel. Master carton holds 4 units. Stated lead time is 25-35 days from order confirmation and deposit. Misting discs, wicks and cartridges are repeat line items and are ordered separately from the appliance.
Three things move this category in South Korea: heated or cooled air that dries a room faster than people expect, buildings sealed tightly enough that nothing replaces the moisture, and a cleaning task that decides whether the product is still in use by March. Two routes dominate access. The traditional route is importer to distributor to retail; the faster one is the cross-border seller who buys direct, preps for the marketplace and skips two margin layers.
Distributors handling Smart Humidifier with Humidistat and Target Humidity Setting lines consistently find that the repeat revenue sits in the consumable, in cartridges and wicks and replacement discs, rather than in the appliance. This is why the table above states figures by model rather than by marketing tier: a buyer comparing two SKUs needs the noise on the sleep step, the run time per fill and the water handling side by side, because those three predict both satisfaction and return rates better than any other set.
Wanlin serves South Korea through three programmes that suit different balance sheets. New partners start with sample evaluation then a mixed trial order. Established distributors move to scheduled container shipments with locked pricing windows. Brand owners run private-label programmes with their own artwork and manuals. In all three cases the factory documentation, including the certificates and battery files listed further down this page, references the specific model code on the order rather than a generic family certificate, which is the most common cause of customs delay in this category. The WL-SM02H (PLUS) packs 4 units to a carton, carries a 24 months warranty and a 25-35 days stated lead time, and draws 15.2 W on the high step.
Three engineering decisions separate this platform from the commodity end of the category. The first is where the intelligence lives. A unit that stops working when the internet does is not a controlled appliance, it is a remote control with a humidifier attached, so the target and the schedule are stored on the unit itself and the network is only a convenience. With the router down the closed loop keeps running to the last target, and when the link returns the logged trace backfills rather than showing a gap.
The second is what the sensor is actually reading, because that decides whether a target means anything. A humidity sensor sitting next to the mist outlet reads saturated air within a minute and shuts the unit down early, so the probe is placed in the intake path behind a baffle and calibrated at the factory against a reference hygrometer. A buyer can repeat the check in twenty minutes with a shop hygrometer, which is the only way a published accuracy figure means anything.
The third is the radio, and it is where cheap builds fail in the field. We specify 2.4 GHz rather than 5 GHz because it reaches through the two walls that matter in an apartment, we keep a Bluetooth path for first pairing so a unit can be set up where the Wi-Fi password is not to hand, and we keep the radio off the safety path entirely: dry-run shut-off, tilt and overcurrent protection are hard-wired and do not depend on firmware. On the WL-SM02H (PLUS) the figures worth carrying into the next order are the 5025 mL tank, the 41.5 hours per fill on the low step, and the 27.0 dB reading on the sleep step.
Three deployment records from the Smart Humidifier with Humidistat and Target Humidity Setting programme, each with the conditions that shaped it. Site detail is kept because it is the part that transfers: the water, the ceiling, the rota and the complaint are what decide whether a unit stays in service, and none of them appear on a specification sheet.
Deployment: A secondary school with 24 classrooms heated by radiators to 22 percent RH through January
Timing: Two academic years from September 2024
The school's problem was teachers propping windows open to manage stuffiness, which made the dryness worse and the heating bill larger. Holding a 40 percent band with a visible reading stopped the window-opening, because the number was on the wall. Absence in the winter term fell by roughly a fifth year on year.
Deployment: A medical device distributor storing packaged stock in a bonded warehouse near the port
Timing: Fifteen months from January 2025
Packaging and printed instructions behave badly in a dry store, and the distributor's customers inspect cartons. Holding 45 percent in the store stopped the corner scuffing and the curling labels. The distributor added the humidity log to the warehouse's own quality file, which is a requirement some of his principals impose.
Deployment: A spare-parts warehouse for industrial electronics beside the Elbe, with ESD-controlled packing benches
Timing: Fourteen months from January 2025
The quality manager's concern was electrostatic discharge at the packing benches, and he wanted a number, not a claim. Two console units hold 45 percent across the bench line and write a trace the auditor can read. Since the log started there have been no ESD-related packing incidents recorded, down from four in the previous year.
The pattern across all three is that the deciding factor was never peak output. It was whether the tank lasted a full shift, whether the unit could be cleaned inside the time a round allows, and whether anyone complained about the noise or the dust. Those are the questions we ask before quoting. The WL-SM02H (PLUS) packs 4 units to a carton, carries a 24 months warranty and a 25-35 days stated lead time, and draws 15.2 W on the high step.
Four placement patterns cover most of the enquiries we see for this category. The useful observation is that each one is answered by configuration and placement rather than by buying a larger unit, which is the default reflex and usually the wrong one.
| Scenario | Room or site | What the site needs | What the unit does |
| SC01-TARGET | Rooms where the brief is a humidity band rather than a mist setting | An output figure answers the wrong question when the buyer actually wants a room held at a number. | The humidistat holds a target band and the app records the trace, so a facilities team can show the room stayed inside the band instead of showing that a unit was switched on. |
| SC06-RECORD | Sites that answer to an auditor, an insurer or an accreditation visit | A claim about indoor conditions is worth less than a chart of them. | An exportable humidity log turns the installation into evidence, which is what a quality file or a workplace report needs. |
| SC02-NIGHTSTEP | Bedrooms that run overnight with the light off and nobody touching a control | A unit that needs adjusting at two in the morning stops being a smart unit and becomes a nuisance. | A scheduled step-down at bedtime holds output low all night, the display goes dark, and the schedule repeats without anyone resetting it. |
| SC07-GROWING | Propagation benches, graft rooms and greenhouses where a missed night costs a crop | Plants fail at three in the morning, which is exactly when nobody is looking. | A held band with an alarm on drift catches the failure at night rather than at the morning walk. |
Two of these four are decided before the unit is switched on: whether the tank lasts the interval the site can actually service, and whether the cleaning task fits the round. For this configuration that means 121.1 mL per hour at 27.0 dB, holding 41.5 hours per fill across a 71 sq m (759 sq ft) room.
The practical advantage of a factory programme is flexibility in how the first order is shaped, not the unit price. A mixed container across three SKUs lets a distributor test a range without committing to full container quantities on unproven models, which is the single biggest risk reduction available to a new importer and one that intermediaries rarely offer because it complicates their own purchasing.
The second advantage is lead-time honesty. A stated lead time of 15 to 35 days measured from order confirmation and deposit, written on the proforma invoice rather than left open, is worth more to a buyer planning a season than a faster number that slips. Battery shipments add a documentation step at booking, which we handle but which needs a few extra days on the freight side, and we say so before the order rather than after.
The third is continuity. Tooling, mouldings and the documentation set stay the same across seasons, so a distributor who lists a model code this year can relist it next year without a new test round. On the WL-SM02H (PLUS) the figures worth carrying into the next order are the 5025 mL tank, the 41.5 hours per fill on the low step, and the 27.0 dB reading on the sleep step.
Four documentation errors account for most of the customs delay we are asked to fix, and all four are avoidable at quotation stage. The first is a certificate naming a family rather than the model code on the invoice. The second is a battery build shipped without UN38.3 and MSDS. The third is a manual in the wrong language for the destination. The fourth is a plug that does not match the destination.
None of those are engineering problems. They are paperwork problems, and they are the reason we ask three questions before quoting: which markets, which languages on the manual and the artwork, and whether any unit in the order carries a cell. Answering those three costs a buyer five minutes and removes the majority of the delay risk.
What we will not do is back-date a certificate or issue one against a model we did not build. A buyer who needs that is a buyer whose shipment will be stopped eventually, and the cost of the test is always smaller than the cost of the container sitting at the port. The WL-SM02H (PLUS) packs 4 units to a carton, carries a 24 months warranty and a 25-35 days stated lead time, and draws 15.2 W on the high step.
The economics of this line are an annuity, not a one-off sale, and buyers who plan it that way outperform the ones who do not. The appliance is the entry; the cartridge, the wick and the replacement disc are the repeat, and in the pharmacy and hospitality channels the consumable revenue overtakes the appliance revenue within the first year.
Freight is the part that needs doing carefully. At 0.179 cubic metres per carton of 4 units, a 40 ft container carries roughly 1,044 units by volume, and a 20 ft about 472. Those are upper bounds before pallet and loading losses, and the honest planning figure is a little below them.
What we suggest to a first-time buyer is deliberately unglamorous: a mixed trial order across two or three SKUs, spares at one disc per twenty units, a stated lead time of 25-35 days written on the proforma invoice, and a re-order point set by sell-through rather than by calendar. On the WL-SM02H (PLUS) the figures worth carrying into the next order are the 5025 mL tank, the 41.5 hours per fill on the low step, and the 27.0 dB reading on the sleep step.
What is the minimum order quantity for a first smart humidifier order?
MOQ is 200 units per SKU for standard builds and 300 units for custom colour or private-label packaging. Mixed-container orders combining several models are accepted as long as each individual SKU clears its own minimum. The specification table on this page shows the exact build we ship for WL-SM02H-PLUS.
How is the noise figure measured, and what does it mean in a bedroom?
We measure at one metre in a semi-anechoic corner and quote the step, so the two published figures for WL-SM02H are 30.0 dB on the high step and 27.0 dB on the sleep step. The sleep-step figure is the one to compare, because it is the step a bedroom unit is left on all night. A buyer can repeat the measurement in a quiet room with a phone application and will get within a decibel or two.
Does this humidifier leave white mineral dust on furniture?
It depends on the water and on the misting method, and it is the single largest cause of returns in this category. An ultrasonic disc throws everything dissolved in the water into the air, so on a hard supply it leaves a fine white mineral film on dark surfaces within days. Two answers exist: a demineralisation cartridge in the tank, which is a consumable with a real working life, or an evaporative build where the minerals stay in the wick. This unit is specified as cartridge bay in the tank neck, two cartridges included on the plus build.
Which compliance files ship with a smart humidifier order?
The standard file set is the CE technical file, RoHS and REACH declarations, an EMC test report, the IEC 60335-1 household appliance safety report, and for battery builds a UN38.3 test report with an IEC 62133 cell report and MSDS. For North America we add FCC documentation for the digitally controlled models. Certificates are issued against WL-SM02H, the model code on the order, rather than against a generic family.
Can we sell these under our own brand, with our own packaging?
Yes. Private label covers housing colour, logo placement, retail artwork, manual language and the accessory kit, and most of it sits inside existing tooling for this range, so customisation does not mean re-engineering. The decision we ask buyers to make early is which consumables travel with the appliance, because a unit sold without a cartridge into a hard-water market generates complaints that no artwork will fix.
Does the unit keep holding its target if the router drops or the internet is down?
Yes, and this is the question we would ask first if we were buying. The target and the schedule are stored on the unit rather than in the cloud, so the network is a convenience and not a dependency. With the link down WL-SM02H keeps running the closed loop to the last target set, target band 30 to 85 percent in 1 percent steps, held within 3 percent, and the local panel still sets every step. When the connection returns the log backfills, which matters because the useful part of a trace is the part when nobody was watching. The link on this build is Wi-Fi 2.4 GHz plus a wired sensor header for a remote probe, and Dashboard view for multi-room installs, exportable CSV humidity log.
What warranty and spares support do you provide?
24 months against manufacturing defect on WL-SM02H. Misting discs, wicks, cartridges, seals and cells are stocked as separate line items and can ride in the same container as the units, which is the cheapest way to buy them. We suggest one spare disc per twenty units and one cartridge per unit where the water is hard.
How long does sampling and first production take?
Samples ship in 5 to 7 working days from an existing specification, or 15 to 20 days if a custom colour is required. First production runs in 25-35 days depending on SKU and quantity, measured from order confirmation and deposit, with the exact figure stated on the proforma invoice rather than left open. Battery shipments add a documentation step at booking.
Five kinds of partner buy this programme, and they want different things from it. Importers want container economics and documentation they can hand to a broker without rewriting. Regional distributors want a range coherent enough to explain on one page, and a spares line they can actually stock.
Brand owners want the artwork and the manuals right and the chassis underneath unchanged, which is the easiest request we handle because most of it sits inside existing tooling. Pharmacy and home-care groups want the consumable, because the repeat revenue is there rather than in the appliance. Cross-border sellers want prep: barcodes, multilingual manuals and packaging that survives a fulfilment centre.
Export traders sit across all five, and the thing they ask for most often is a specification sheet they can forward without editing, because their customer will ask about noise, run time and water before asking about price. On the WL-SM02H (PLUS) the figures worth carrying into the next order are the 5025 mL tank, the 41.5 hours per fill on the low step, and the 27.0 dB reading on the sleep step.
The cleanest first orders we see share one habit: the buyer declares the destination list at quotation stage. Certificates, manuals and plugs all follow from it, and raising them once as a package costs far less than raising them market by market as each order lands.
After that the sequence is ordinary. Sample evaluation first, on the actual specification rather than a similar one, with the buyer measuring mist output by a weighed run, run time per fill at the low step, and noise at one metre in a quiet room. Then the proforma invoice, which carries the stated lead time and the packing list rather than leaving them open. Then production, then booking.
The one step buyers skip and regret is the spares decision. Adding a spare disc per twenty units and a cartridge per unit where the water is hard costs almost nothing on a first container and prevents the top-up shipment that otherwise arrives in the middle of the season. On the WL-SM02H (PLUS) the figures worth carrying into the next order are the 5025 mL tank, the 41.5 hours per fill on the low step, and the 27.0 dB reading on the sleep step.
The right way to evaluate this unit is to order a sample on this specification and measure it: mist output by a weighed run, run time per fill at the low step, and noise at one metre in a quiet room on both steps. All three are reproducible, and a buyer who runs them will know more in an afternoon than any datasheet can convey.
We publish figures that can be checked, we state the ceiling height behind the coverage number, and we say plainly where the honest answer depends on the room or the water. That is a narrower claim than some competitors make, and it is the one we can stand behind at sample stage.
Export enquiries are welcome from distributors, brand owners, pharmacy and home-care groups, hospitality operators, cross-border sellers and export traders. Samples, specification sheets and the certification and battery files are available on request. For this configuration that means 121.1 mL per hour at 27.0 dB, holding 41.5 hours per fill across a 71 sq m (759 sq ft) room.
Published by: Wanlin Manufacturing Group, MistAirHome Export Division
Published on: September 29, 2026
Data sources: in-house factory testing + misting disc and cell specifications + certification and battery files + partner deployment records
Company address: Wanlin Group, Building B, Building 1, Beisida Medical Device Building, 28 Nantong Avenue, Baolong Community, Baolong Sub-district, Longgang District, Shenzhen, Guangdong, China
References: factory quality manual + third-party test reports + customer shipment records
Contact: Mistairhome@163.com / +8613261677119 / https://www.mistairhome.com
