Evaporative Duct Mounted Whole House Furnace Humidifier with 8 UV-C LEDs, Atomizing Cool Mist Variable Capacities for Homes and Offices up to 3500 sq. ft.
Original price was: $189.50.$28.99Current price is: $28.99.
Product description
Product Description:
The DIGI MISTER duct mounted evaporative whole house humidifier, designed, patented, UL 998, CSA C22.2 No.104 Safety Standard tested and certified by SGS North America Inc. in 2022 (Certificate #: SGSNA/22/SUW/00074X) in the United States, is installed to operate in conjunction with the forced-air heating, ventilating, air conditioning (HVAC) systems for residential houses or office buildings. It is designed to be less expansive, water and energy efficient, low maintenance, and easy to install in comparison with other duct mounted humidifiers.
Customers can precisely set room humidity, a hot air temperature and water pressure when the water spray starts. Once the humidity is lower than desired and the hot air temperature rises to the pre-set point, atomized water mist will be dispersed into the passing hot air by the fan-shaped spray nozzles. A mini vibration motor on the spray nozzle bracket facilitates the formation of the fine water mist. The fine mist will evaporate and then be carried into your home by the furnace hot air flow. Eight (8) UVC LEDs will be lit on when the DM538 humidifier is powered up. Customers can have this function even in summer when the AC is running.
This humidifier is suitable for most duct type of forced-air HVAC systems, such as gas or oil heated, up/downflow or horizontal, single stage or multi-stage, heat pump with aux heat and electric furnaces. Due to its compact design, only a small cut-out at or near the plenum is needed for installation. No bypass duct, no drainage and no high voltage power line is required. It can be installed not only in homes or offices, but also in applications where space is very limited. The DIGI MISTER humidifier is an ideal humidification solution for homes or apartments that have the HVAC system installed in a small utility closet or that are built on a slab. Additionally, if an existing humidifier doesn’t provide sufficient humidity, the DIGI MISTER can be easily installed and maintained as a supplementary humidity booster.
Flexible Capacity for Homes or Offices of Different Sizes
Install proper number of spray nozzles based on the size of the home or officeUse the nozzle tester to test and clean the nozzles before installing on the humidifierTest with fewer number of nozzles first. Add nozzles only if water mist still can evaporate fullyReduce water pressure, increase hot air temperature or fan speed can help water mist evaporationFurnace type and duct size determine how many spray nozzles can be installedDon’t put too many nozzles or any faulty nozzle on the DIGI MISTER humidifiers
Arrange Spray Nozzles According to Supply Duct Size
Spray nozzle number can be adjusted based on the size and output of your furnaceUser can determine how many and where the spray nozzles should be installedReduce water pressure will decrease the water mist stroke and amountProper arrangement ensures that the water mist evaporates fully before reaching the duct wallReduce water pressure, nozzle numbers or rearrange nozzles if there is any wet spot or water puddles inside ductDo not put the humidifier on the ducts less than 10 inch height, such as a 16″X8″ duct
Hot Air Temperature at the Furnace Plenum
Different furnace types have different hot air temperatures at the plenumDon’t install the humidifier where the hot air temperature is constantly above 150°FUser can setup an exact temperature to trigger the water sprayLow air temperature and slow fan speed will negatively affect water mist evaporationUVC LEDs must have moving air for cooling to prevent overheatingRecommended trigger temperature is 100 ~ 120°FIt may not be suitable for the heat pump systems without aux. heat and some multi-stage furnaces
Take Control of Your Humidifier
A fine atomized water mist is the key to effectively evaporated into the passing hot airEach nozzle must be tested and cleaned by using provided nozzle tester before installationThe mist status can easily be checked via the built-in observation windowWater mist can not be atomized appropriately if the water pressure is too lowClean or replace the nozzles which don’t spray fine mist immediately
FREQUENTLY ASKED QUESTIONS
Why there is water leakage from the water pressure regulator body and I can’t adjust the water pressure?
The water pressure regulator is a unidirectional device and must be connected in its designated flow direction. Check the flow direction mark or label on the regulator body before connecting it to the water lines. If connected incorrectly, it will be unable to regulate the pressure and may result in excessive water leakage. Don’t try to turn the pressure all the way down to zero to shut off the water, which will cause water leakage. It is a water pressure regulator, not a shut off valve.
What can I do if some of the nozzles I received cannot spray fine water mist?
The DIGI MISTER humidifiers can support max. 5 fine mist nozzles. These nozzles are specially designed to be used for low pressure applications. They have a tiny orifice hole (0.1mm) and several small components which must work together perfectly to form a fine water mist. Due to such large volume mass production these components cannot be exactly the same in dimension, shape, surface finish, etc. so each nozzle will perform differently. Users must use the nozzle tester to easily test and clean all the nozzles, no matter new or used, before installing on the humidifier. DO NOT INSTALL FAULTY NOZZLES in your humidifier.
What factors must be considered for the mounting location of the humidifier?
When considering the mounting location of a humidifier, these factors must be taken into account to ensure optimal performance and efficiency:
1. Temperature: The hot air temperature must fall within the range of 100°F to 150°F. This temperature range ensures that the water mist can evaporate efficiently without being too low to cause slow evaporation or too high to potentially damage the humidifier.
2. Hanging time in the air: Placing the humidifier where the mist can hang in the air for as long as possible ensures maximum evaporation efficiency. It is essential to avoiding locations where the mist may hit the duct walls or other surfaces, which will lead to water puddles and leakages.
3. Number of nozzles: An ideal mounting location should accommodate the installation of a sufficient number of nozzles (maximum of 5). The best location for mounting is typically at a “T-section” above the AC coil in the furnace plenum. If mounted on a horizontal duct with at least 10” height, the number of nozzles will be limited by the duct width.
What if the nozzles spray perfectly fine mist, but there are still some wet spot or water puddles in the duct?
In this case you need to reduce the water pressure and the number of the nozzles installed because the furnace hot air cannot vaporize all the water mist sprayed. You can also try to increase the hot air temperature or increase the draft motor speed for quicker evaporation.
How can I set up my humidifier for my multi-stage furnace with a variable speed blower?
In general, the multi-stage furnaces equipped with a variable speed blower, such as a ECM motor, will run in a slow motor speed and a relatively low hot air temperature (but not below 100℉). Due to slow air movement, you can use a few spray nozzles (like 1 or 2) or adjust to a lower water pressure first to check if the water mist can evaporate fully, only increase nozzles if the furnace and duct is still dry. You may get enough humidity with fewer nozzles because this type of furnace is usually running at lower stage with long period time or almost constantly on.
Can I use my current furnace thermostat with a humidistat, such as a Nest Thermostat, to control the DIGI MISTER humidifier?
Your current smart furnace thermostat can partially control the DIGI MISTER humidifier. If you use the humidifier control function of a Nest thermostat to power up (24VAC) the DIGI MISTER humidifier, make sure to select “Hum.+Heat” for activate and set a high target humidity level on the DIGI MISTER. In this way the humidifier will be powered on when the Nest calls for humidity and for heat, the Nest takes over the control on humidity criteria. However, you must set the hot air temperature on the humidifier above 100 degree Fahrenheit so that the water mist can be sprayed and fully evaporated only when the hot air temperature in the duct reaches the setting point. The DIGI MISTER should still control when to start to spray mist.
Why the surface near the UVC LEDs on the humidifier getting dark and darker after several weeks of in operation? Should I be concerned?
The enclosure materials of the DIGI MISTER humidifiers are UL 746C Yellow Card materials, suitable for use with respect to exposure to ultraviolet light, water exposure and immersion. It is allowed some discolor with the time on the surface, but the material strength and any other characteristics will not be affected. There is a SGS Certification sign on each of our products, customers can be sure that there are no safety issues associated with our humidifiers.
FLEXIBLE CAPABILITY. By changing the number of fine mist nozzles (1 to 5), adjusting the water pressure and the warm air temperature, DIGI MISTER humidifier can be used for homes and offices of various sizes from 1000 to 3500 sq. ft., as well as work with different types of furnaces.
EASY INSTALLATION. With a patented compact design this humidifier only needs a small cut-out for installation and can fit into a small area and tight space easily. No duct work and drainage are required, and the connection is simple and easy. A 24VAC transformer is required, or an all-inclusive DIGI MISTER humidifier installation kit will make the job much easier. Certain HVAC expertise is needed to perform the installation.
CONVENIENT MAINTENANCE. Through an observation window, users can visually check the water mist status to make sure for a complete evaporation. Spray nozzles can be conveniently tested and cleaned by using a nozzle tester away from the humidifier. With a “swing-out” design the spray nozzles can be replaced effortlessly. The package includes extra replacement nozzles. Users must ensure that the water pressure is adequate, and all nozzles spray fine atomized water mist.
FULL DIGITAL CONTROL. Users can precisely set and adjust room humidity, duct air temperature, as well as many other secondary parameters, such as humidity value calibration, temperature unit between °F and °C, etc.
WATER, ELECTRICITY and Money SAVING. Water is sprayed into the duct under a suitable water pressure (>30 psi) to form an atomized mist which fully evaporates into the air, with no wasted water running off and down the drain. No high water pressure pump, no power fan or high wattage electrode are needed for a very quiet operation and no more evaporative water pads or expansive steam canisters to buy once every winter season.
260-280 NM WAVELENGTH UVC LIGHT. Eight (8) UVC LED lamps equipped on the DM538 humidifier will be turned on whenever the humidifier is powered up. Customers may have this function even in summer when the AC is running.
8 reviews for Evaporative Duct Mounted Whole House Furnace Humidifier with 8 UV-C LEDs, Atomizing Cool Mist Variable Capacities for Homes and Offices up to 3500 sq. ft.
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LWS –
High-Tech Simple Water Saver
I have had the unit(s) for a little over a month. I wanted to wait and give some time to use them before I wrote this review. Units like this are used in large commercial systems, so it does not make sense that some company did not make a smaller unit like this for the home before now. I have 2 of them on 2 systems in my home. They work great. If you are someone that is installing this yourself, it is a straightforward, very simple install. The best advice I can give is to READ the User’s Manual and follow it. The other is that the unit will work okay if you use cold water but works wonderfully if you use hot water. Simple physics. If you have a whole home water filter, this is not a problem. If you do not have one and have hard water, you might need to clean the nozzles more often. It does take a little run-time and adjustment of the unit to find the sweet spot for adjustment of the temperature on setting. The unit is set at 110 degrees from the factory, but on my smaller 60,000 BTU furnace, I have found that I needed to adjust that down to 97 degrees to achieve my desired humidity level. On my larger 100,000 BTU furnace, 103 degrees is the sweet spot. The manufacturer Unisys Technologies has great support via email and phone. I called, and a real human answered the phone and was very knowledgeable about the unit and a great help to me. If you have any questions, contact them. The unit has many advantages over traditional whole-home humidifiers, but water usage is the biggest. Unlike other whole home humidifiers, water is not running off and down the drain. Where I live, water is relatively inexpensive, but sewer is expensive, and they base my sewer rate on winter water usage. I think It is that way for most people. I am now using an average of 9 to 12 gallons of water daily for both units compared to 80 to 110 gallons daily with my old traditional humidifiers. The old ones were like having a small water leak. The difference in water usage is about $30 a month on my sewer bill, almost enough to pay for both units in the first year. I rarely write reviews, but I think this humidifier is worth doing so. However, I can not stress enough to use hot water. It will work with cold if that is all you can use but Hot water work so much more effectively. It was well worth the time I spent fine-tuning the unit(s) on temperature for the cost savings on my sewer. You might think that you should adjust the temperature on to the lowest temperature you can. DON’T. It needs to warm the nozzles, so the mist is fine, and you need the blower to move air before it comes on. Also, I found that I could adjust my blower off-setting for 3 minutes after the heat call stops. If you can do this on your system, you should. This will help ensure that all the moisture is out of your ductwork. As one other reviewer noted, this is not a set-it-and-forget-it product. No whole-home humidifier is. I have found that a stiff bristle toothbrush works well for cleaning the nozzles. I have cleaned the nozzles once in a month of use. They were working fine but replaced the air filters on the furnace(s) and cleaned the nozzles as preventative maintenance. One more thing, and not about this humidifier. If you have the normal 1″ or 2″ furnace air filters, you need to change them at least once a month. They are not meant to last 3 or 6 months. Changing them once a month or more often will keep good airflow and save you money in the long run. All in all, this is a great humidifier unit with wonderful customer support.
Amazon Customer –
Works well but not without caveats
We live in a very dry climate, my wife is very sensitive to low RH, and I’ve been seeking a suitable alternative to the leaky, ineffective, and wasteful pad-based humidifiers I’ve installed previously. This seemed like a simple and novel alternative at a reasonable price-point, so I figured I’d give it a shot.My install was complicated by the fact that I had to first patch a much larger hole where the previous forced air humidifier was mounted, but once done, install was the initial install was straightforward. After activating it for the first time, however, I too witnessed the pooling of excess water others have reported.No surprise based on other reviews, and I don’t really see how Unisys thinks this is avoidable in the first place–you’re spraying water at unknown pressure into an unregulated system with variable airflow and temperatures. Of course it’s not all going to evaporate all of the time!Anyway, I knew what I was getting into and mounted the unit directly above my AC coil, which sits inside of a pan with a drain for condensation, so any excess goes down the drain (and is far less wasteful than what I replaced). That said, I did have to spend some time baffling and caulking the ductwork to ensure that any excess water flowed into the pan.My previous humidifier included a pressure switch to detect when the blower is operating, so I re-purposed that as an additional safety precaution (now requires airflow + configured temp to activate). Should also allow me to use the unit year-round without fear of it running continuously.Minus 1 star for doing a rather poor job of disclosing or designing around what is (based on my experience and other reviews) a common problem, but the RH in our home has more than doubled up to 40%, so this device definitely works if you’re willing to engineer around its shortcomings!
SaintChuck –
SIMPLE installation. IMMEDIATELY effective. RESPONSIVE support, when needed.
Was the answer for all of my troubles with previous big box store, furnace mounted humidifier.. Easy installation. Easy adjustments. Great results.Just did season #2 start-up routine: powered up and tested everything – humidity and temperature -check, manual spray – check. Replaced nozzles, cleaned window and little calcium deposits on unit – check. Turned furnace master back on and humidistat is no longer sensing or indicating. Disconnected and analyzed 3-wire humidistat plug – check. Humidistat problem. Sending email to support within the two-year warranty period. Will update this review based on their responsiveness.**Updated: SERVICE was RESPONSIVE and THOUGHTFUL. Replaced humidistat due to suspected three-wire plug failure. Back in service!I so much prefer a misting humidifier than a blow-thru filter type. Easier maintenance, less “invasive,” and much more controllable.Ask me any questions.
Jordan –
Install was simple. Easier than a bypass humidifier without the required drain line or ducting from return to supply air. There is no wasted water with this device, and all mist produced is immediately evaporated into the supply airstream if installed correctly.If you’re relatively handy, the install can be done in around an hour or so. (if you’ve planned ahead, and have all the parts needed to supply a 1/4″ water feed from somewhere close.I placed a 3/4″ x 3/4″ x 1/4″ shut off T-fitting from my adjacent hot water heater). Outside of the water feed, all you have to do is use tin snips to cut a small hole in the correct location on your supply duct, wire the unit (two wires and a transformer) and install the wired humidity sensor. I also used an inline charcoal filter on the water feed and the supplied water pressure regulator.The humidity in my house (Western Canada) went from around 20% to a pretty consistent 40% in a couple of days and has held well for a couple of weeks now. I placed numerous digital hygrometers in different levels and locations in my home so I can monitor throughout the house. I am very happy with the result.I did have a couple of issues with the supplied misting nozzles upon first installation, and did use the tester that comes with the kit prior to installing, but still some of the nozzles when installed in the furnace ducting where just shooting straight streams of water vs mist as they did during the test.I removed all the nozzles, disassembled and cleaned, and flushed out the inline charcoal filter on the water supply line, and problem was solved. I did have to email back and forth with the seller a few times, and their support, advice and response time was AMAZING!!! Even on a weekend!Once this issue with the nozzles was resolved, the unit has been performing just fine since. No leaks, no issues at all, and I look through the little ‘display window’ daily to ensure that all nozzles are still spraying fine mist, and they are. I don’t think this little clear window into the duct would do you any good without the UV LED’s that are installed to ‘purify the air’ but maybe you could shine a flashlight in there or something?At the end of the day, I have been looking for an innovative and effective solution to my winter humidity issue for many years, and dumping water down the drain with a giant bulky bypass humidifier never appealed to me at all… As soon as I came across this device, it checked all the boxes so I took a chance, and I’m glad I did.In future upgrades and models, it would be nice to see a wireless humidity sensor come with the unit vs. a hard wired sensor that is suggested to be installed ‘within 10 feet of the unit’, however this does seem to be working fine with the wired sensor. It would also be great to have the ability to adjust or monitor via a mobile phone app, but again, it works well as it is currently designed, so the above suggestions would just be minor convenience improvements.I would recommend this product for anyone looking for a simple, non-invasive solution to winter home humidity issues, and I have been thoroughly impressed with the customer support and communication. I hope this device works for me for years to come!!!
Dan Moffet –
Really well constructed. Very well and compactly package. Excellent instructions. Easy to install. Easy to make settings.The only challenge is to see through the viewport because the ductwork is at the ceiling – I need a stool!Love it!
Jonathan B. –
Actually installing the device only took 20 minutes. Trying to figure out exactly how to wire it to a furnace that doesn’t have a humidifier header took a bit. If you’re in that situation (or just don’t want to get a 24vac transformer you can wire it to the W and C terminals on the thermostat connectors in the furnace control board (double check your manual, obviously, it would suck to blow up your humidifier.) That will activate it when heat is requested, and the thermostat subsystem will almost certainly be 24vac though again check your manual.The device seems well built and looks pretty snazzy, I hope it lasts a good long time.
Alex –
The DIGI MISTER works well with a tankless heater and delivers fine mist as promised. But despite using filters, the nozzles clog often and need frequent cleaning. Fantastic idea—just too much upkeep.
Vahid –
It is very compact and easy to install. I believe it several times better and more efficent than conventional humidifyer. I love it.