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AprilAire 400 Whole-House Humidifier, Automatic Water Saver Furnace Humidifier, Large Capacity Whole-House Humidifier for Homes up to 5,000 Sq. Ft., White

4.3 4.3 out of 5 stars 308 ratings

$299.99
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Humidifier
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Purchase options and add-ons

Brand Aprilaire
Special Feature Adjustable Humidity Control, Digital Display, Quiet, Auto Shut Off, Service Filter Indicator, Humidistat See more
Color Gray
Filter Type Wicking Evaporative
Floor Area 5000 Square Feet
Capacity
17 Gallons
Material
Plastic
Power Source
ac
Control Method
App

About this item

  • BUY WITH CONFIDENCE This humidifier was designed and manufactured in the U.S.A. by AprilAire – the inventor of the whole home evaporative humidifier, and the leader in indoor air quality solutions
  • FULL COVERAGE up to 5,000 square feet in tightly built homes with a capacity of 17 gallons per day
  • AUTOMATIC HUMIDIFIER with dual sensors to monitor and respond to both outdoor temperature and indoor relative humidity to deliver optimum humidity 24/7 throughout the home – simply set it and forget it
  • CONSERVES WATER using a unique process that evaporates 100% of the water flowing into the water panel
  • HUMIDITY FOR HEALTH AprilAire Humidifiers can help you maintain optimal humidity in your home of 40% – 60% which has been shown to reduce the incidence of respiratory infections and symptoms related to allergies and asthma by minimizing the formation of bacteria and viruses, fungi, and dust mites. In addition, you’ll feel more comfortable while also preserving items in your home susceptible to damage from changing humidity or dry conditions

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 10.25 x 15.38 x 15.75 inches; 8.8 Pounds
  • Item model number ‏ : ‎ 400Z
  • Date First Available ‏ : ‎ March 3, 2010
  • Manufacturer ‏ : ‎ Research Products Corporation
  • ASIN ‏ : ‎ B004PDDZRS
  • Country of Origin ‏ : ‎ USA
  • Customer Reviews:
    4.3 4.3 out of 5 stars 308 ratings

Product Description

AprilAire introduced the first evaporative humidifier for forced air furnace systems back in 1954. Since that time, AprilAire continues to lead the industry in whole home humidification systems. Our evaporative humidifiers work by piping water into the distribution tray located at the top of the humidifier. The water is uniformly distributed across the width of the tray and through a scientifically designed system of outlets. It flows by gravity over the Water Panel evaporator. Dry, hot air from the HVAC system is moved through the moisture-laden Water Panel evaporator. Natural evaporation takes place, the water is turned to vapor, and the humidified air is circulated throughout your home. This unit is uniquely designed to evaporate 100% of the water going into the humidifier.  It incorporates a special two-stage float system to maintain the optimal amount of water and protect against overflow.  In the unlikely event the float system fails, it is recommended an overflow tube (1/2 inch inside diameter) be installed to the base of the humidifier and run to a condensate pump, a sink, or a floor drain.  Follow the required maintenance instructions. INCLUDED IN THE BOX: Installation instructions and template, humidifier with built-in bypass damper, 24 VAC transformer, automatic digital humidifier control with sensor, outdoor temperature sensor, saddle valve, solenoid valve, and Model # 45 Water Panel


From the manufacturer

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Balance your home's humidity

AprilAire Whole-House Humidifiers balance your home's humidity to help improve sleep and dry skin, enhance productivity, and keep you protected against airborne viruses. Additionally, AprilAire Humidifiers help preserve your home and any contents susceptible to cracking and warping due to low humidity levels.

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Maintain Wellness

Reduce airborne illnesses that can cause respiratory infections, asthma attacks, and allergic reactions by maintaining proper relative humidity in your home.*


*E.M. Sterling, “Criteria for Human Exposure to Humidity in Occupied Building,” ASHRAE Winter Meeting, 1985


Lower Energy Costs

Humidifiers can affect the "real feel" temperature in your home, which can prevent your furnace from working overtime.

Home Preservation

Air that’s too dry can cause wood to splinter. Protect the structural integrity of your home and wooden furnishings like floors and cabinets with solutions intuitively designed to create healthy environments.

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Compatible AprilAire Water Panel Humidifier Filter

Humidity for Comfort

Whether your home is in a dry region of the country, or in an area with seasonal dryness, maintaining proper humidity levels can make all the difference in how comfortable you feel in your home.

Humidity Control at the Ready

All our humidifiers ship with either an Automatic or Manual Humidifier Control (also known as a Humidistat). With an AprilAire Whole-Home Humidifier, you will also avoid common problems associated with less moisture in the air such as dry throat and static shock.

AprilAire Genuine Water Panels

Designed to keep your AprilAire humidifier operating at peak performance, AprilAire Water Panels should be changed per the recommended schedule for your Model, typically once or twice per heating season. All AprilAire Whole-Home Humidifiers ship with the Water Panel(s) needed for one season. Additional/Replacement Water Panels sold separately.

image image image image image image
AprilAire 400 Whole-House Humidifier + Automatic Control AprilAire 300 Self-Contained Whole-House Evaporative Humidifier AprilAire 500 Whole-House Humidifier + Automatic Control AprilAire 600 Whole-House Humidifier + Automatic Control AprilAire 700 Whole-House Humidifier + Automatic Control AprilAire 800 Whole-House Steam Humidifier
Customer Reviews
4.3 out of 5 stars
308
3.9 out of 5 stars
6
4.5 out of 5 stars
1,745
4.6 out of 5 stars
784
4.5 out of 5 stars
1,101
Price $299.99 $598.49 $267.09 $349.99
Water Capacity (Gallons Per Day) 17 GPD 13 GPD 12 GPD 17 GPD 18 GPD 11.5 GPD
Home Size Coverage 5000 Sq. Ft. 3900 Sq. Ft. 3600 Sq. Ft. 5000 Sq. Ft. 5300 Sq. Ft. 10,300 Sq. Ft.
Water Panel Model & Replacement Frequency Per Season 45, Twice 35, Once 10, Once 35, Once 35, Once 80 Steam Canister, Once
Fan Included Yes
Floor Drain Required Yes Yes Yes Yes Yes
Dimensions & Weight 15.38" L x 10.25" W x 15.75" H, 10.0 lbs. 14.38" L x 22.07" W x 12.43" H, 29.2 lbs. 15.63" L x 10.25" W x 13.0" H, 7.75 lbs. 15.38" L x 10.25" W x 15.75" H, 10.0 lbs. 15.91" L x 11.35" W x 18.0" H, 17.0 lbs. 10.13" L x 7.13" W x 20.88" H, 23.0 lbs.
Electrical Specifications 24VAC, 1 phase, 60 Hz, 0.5 Amps 120VAC, 1 phase, 60 Hz, 0.7 Amps 24VAC, 1 phase, 60 Hz, 0.5 Amps 24VAC, 1 phase, 60 Hz, 0.5 Amps 120VAC, 1 phase, 60 Hz, 0.8 Amps 120VAC, 1 phase, 60 Hz, 11.5 Amps

What's in the box

  • 24VAC Transformer, Humidifier Control, Valves, Installation Instructions
  • Product guides and documents

    Looking for specific info?

    Customer reviews

    4.3 out of 5 stars
    4.3 out of 5
    308 global ratings

    Customers say

    Customers like the performance, quality and water efficiency of the humidifier. For example, they mention it works well, raises humidity very quickly and that it's worth the money. Some are happy with auto shut off, draining, and appearance. That said, opinions are mixed on ease of installation.

    AI-generated from the text of customer reviews

    51 customers mention44 positive7 negative

    Customers like the performance of the humidifier. They mention that it works well, the controls work great, and the level switches operate properly. They also say that it's easy to install and the control works great.

    "...As for the functionality of the unit, it's working great so far. I really like the water saving feature on it...." Read more

    "...Pros: Installed Easier than it looked, works well, automatic adjustment of humidity, Doesn't waste any water, circulates air in my home...." Read more

    "...They essentially operate independent of each other but if the furnace was shut off the level switch on the humidifier would shut the water to the..." Read more

    "...Several great customization features that work very well with my furnace...." Read more

    44 customers mention32 positive12 negative

    Customers like the quality of the humidifier. For example, they mention it does a good job of keeping some humidity in the house during the dry season, it raises humidity very quickly, and it doesn't waste any water. Some appreciate the outside humidity sensor. Overall, most are happy with the product's quality and functionality.

    "...I like the outdoor temperature sensor to use the automatic feature for humidity adjustment, and it also has a feature to turn on the furnace blower..." Read more

    "...Installed Easier than it looked, works well, automatic adjustment of humidity, Doesn't waste any water, circulates air in my home...." Read more

    "...temps are typically 20 degrees or lower, I find I'm struggling to keep the humidity above 20%...." Read more

    "...It's a well made humidifier, nicely packaged, relatively easy to understand install instructions for the handyman type...." Read more

    24 customers mention18 positive6 negative

    Customers like the water efficiency of the humidifier. They say it saves water, it does not drain water unless there is a problem, and it only uses water when the wick gets dry. This makes for a much more economical use of water.

    "...This makes for a much more economical use of water in my opinion, and still has an overflow drain tube in case of malfunction...." Read more

    "...Ultimately, I picked this model for its efficient water usage and after a lot of use I am positive I made the right choice...." Read more

    "...There’s no wasted water to the drain which is super cool...." Read more

    "...I chose this unit over other aprilaire models because of it's water efficiency...." Read more

    9 customers mention9 positive0 negative

    Customers appreciate the value of the humidifier. They mention it's worth the money, has a great price, and saves them a lot of money.

    "...featured humidifier I saw at this price point, and was a very good value for the money." Read more

    "...In any case, worth the money." Read more

    "...Great price, great device (based on 400M performance over past 10 years), and ultra-fast delivery. I am pleased." Read more

    "...Straightforward installation. Saved me a lot of money doing it myself." Read more

    5 customers mention5 positive0 negative

    Customers like the auto shut off feature of the humidifier. They say the digital controller can operate in manual or automatic mode, and they love the auto feature. They also mention that the digital control is intuitive and allows them to modify features at will. Overall, customers say it's the most precise and full control humidifier at this price point.

    "...This is the most precise and full control featured humidifier I saw at this price point, and was a very good value for the money." Read more

    "...The digital controller is intuitive, allowing me to modify features 'at will' quickly...." Read more

    "...said but was able to install the digital controller and can operate in manual or automatic...." Read more

    "...Haven't seen any water drain from it and love the automatic controller. Set it and forget it." Read more

    5 customers mention5 positive0 negative

    Customers like the draining feature of the humidifier. They say it does not require a floor drain and has an overflow drain tube in case of malfunction.

    "...more economical use of water in my opinion, and still has an overflow drain tube in case of malfunction...." Read more

    "...I chose this model because it does not require a floor drain...." Read more

    "...It does run a lot, but I have never found water draining. I normally flip the evap insert in the middle of winter and replace it each year...." Read more

    "I was attracted to this unit because of the drain-less feature. Don't be surprised like I was when I received this item...." Read more

    3 customers mention3 positive0 negative

    Customers like the appearance of the humidifier. They mention it has the best design, is very nice, and has a digital display. Some say the installation was a bit more involved than expected.

    "The product is very nice, though installation was a bit more involved than I anticipated, mostly because of the differences between the old unit and..." Read more

    "...with my home furnace humidifiers I can honestly say this is the best design, most efficient, and I would recommend this model to anyone considering..." Read more

    "Exactly what I was looking for. Love the digital display and it was easy to install." Read more

    56 customers mention34 positive22 negative

    Customers are mixed about the ease of installation. Some mention that it works well and is relatively easy to install, while others say that it was more involved than they anticipated. The instructions don't do a good job of showing that, and the wiring was a bit tricky.

    "...It did not seem very complicated to me though, and the directions included appear very clear and straightforward...." Read more

    "...The instructions don't do a good job of showing that. I wanted to run the unit in manual mode until I ran the outdoor temperature probe...." Read more

    "...The kit includes a saddle valve which makes for an easy install. Unfortunately these aren't the greatest so I put in a different valve...." Read more

    "...Pros: Installed Easier than it looked, works well, automatic adjustment of humidity, Doesn't waste any water, circulates air in my home...." Read more

    Worth it
    5 Stars
    Worth it
    It definitely makes the house feel more comfortable. My heating bill in January was $158. I installed this in the beginning of February and it was about as cold as January and when I got my bill for February it was $108. I noticed how much less it was running. The air doesn’t feel dry anymore. Install was pretty straight forward but YouTube videos helped with the wiring which was pretty simple. Worth it.
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    Top reviews from the United States

    Reviewed in the United States on December 15, 2019
    Style: HumidifierVerified Purchase
    Let me start off by saying I installed this myself, and I am a technician by profession, so it may have been easier for me than for some people. It did not seem very complicated to me though, and the directions included appear very clear and straightforward. I think anyone with some basic tools and mechanically inclined could do this themselves, otherwise you might want to hire a professional installer. The kit included everything I needed except sheet metal screws and tubing (1/4" copper for water supply, 1/2 clear vinyl for drain), and some additional 14-20 AWG wire nuts. I also bought an additional T-fitting with 1/4 turn shut off valve to hook up the water supply in my 1/2" copper hot water pipe. I don't recommend using the saddle valve they provide in the kit for the piping, as they frequently fail, and do not meet code. I mounted the unit on the return manifold, and used a couple of 90° 6" elbows and a few feet of flexible HVAC hose for the bypass duct, and sealed it all with the silver foil HVAC tape.
    As for the functionality of the unit, it's working great so far. I really like the water saving feature on it. It comes with a composite material filter (paper/metal screen) and a tray with float sensors to shut off the water valve if it gets full. This makes for a much more economical use of water in my opinion, and still has an overflow drain tube in case of malfunction. I like the outdoor temperature sensor to use the automatic feature for humidity adjustment, and it also has a feature to turn on the furnace blower to circulate and humidify the air if the humidity level is too low, separate from the thermostat control, which is very nice. Both features work perfectly so far, and my relative humidity went up 10% after the first day. This is the most precise and full control featured humidifier I saw at this price point, and was a very good value for the money.
    16 people found this helpful
    Report
    Reviewed in the United States on February 8, 2014
    Style: HumidifierVerified Purchase
    I spent a lot of time deciding on a humidifier. I checked humidity levels all over the house and they were pretty consistent at 23-25% at 25-30 degrees outside. My home is 3000 sf and the specs for this model put that size at its limit. I was debating between the 600 and this model, the 400. Ultimately, I picked this model for its efficient water usage and after a lot of use I am positive I made the right choice. Unlike other humidifiers this one does not drain water unless there is a problem. Water still comes in from the top and flows over the water panel but water flow stops when a holding cup gets filled on the bottom. Other models just keep running water until there is no longer a call for humidity by the humidistat. The water in the cup is then wicked up and then water flow turns on again, This happens over and over as needed.

    Installation was pretty straight forward. It took $36 worth of parts at the hardware store and about 3 hours to get it installed. Tape the supplied outline on either the supply (make sure it's above the AC Coil) or the return duct and cut a hole. Find a spot for the bypass (a 6" round duct) on the other duct and make a hole there. The unit mounts the the duct with several screws (self taping sheet metal screws make fast work) and two screws for the 6" duct coming off of it. Just a tip - if the unit can be mounted with the first section of duct attached then screw it on before mounting it. I had a little trouble getting a drill in there once it was mounted to the furnace. I used metal tape on the edges of the unit itself and all the duct joints. I used two adjustable elbows and a short section of flex duct to make the connection between the unit and the bypass.

    Now for the water. I did more research on this than I care to admit. Here's what I kept reading, if the furnace does not have long run cycles then run hot water to the humidifier. They explained it that if the furnace doesn't get hot for a long time then the humidifier will not work as efficient. So, with that logic I ran hot water to it. The kit includes a saddle valve which makes for an easy install. Unfortunately these aren't the greatest so I put in a different valve. This took more time than anything else. Once the valve was in, I ran the shortest possible length of tubing to the humidifier in an attempt to keep the incoming hot water as hot as possible. After running the humidifier for some time now, my opinion is the hot water makes no difference. The water flow doesn't run enough to keep it hot for very long. I found that water will run for maybe 1 minute max before the fill cup fills and shuts off the water. After a couple minutes the cup will empty and water will run again, but this time for even less time because the water panel is already wet. The heat from the furnace, even on a short run time, seems to do just fine.

    Next was the wiring. Turn off power to the furnace to avoid frying the board. I tapped into an existing 24VAC line for the power, connected the C (common) and H (humidifier) from the furnace board, the white and yellow from the humidifier and the outside temp sensor wires to the humidistat. I mounted the humidistat before the humidifier on the cold air return.

    The humidistat will work in automatic mode based on outside temperature. I found this a little conservative for my home. When in manual mode I can maintain over 40% humidity without a problem. I usually don't keep it this high but wanted to see if it could do it. I took the same humidity readings as prior and have a reading within 3% throughout the house.
    209 people found this helpful
    Report
    Reviewed in the United States on February 5, 2014
    Style: HumidifierVerified Purchase
    Went together easier than I expected. Took about 2 hours to install, and it worked the first time I flipped it on. I spent an extra $40 on install supplies. I had the tools needed, thankfully. I thought the wiring into the furnace would be a pain, but it all went together rather easily. I didn't even hit any bumps. Honestly, I enjoy doing DIY projects and find overcoming problems in the process very satisfying. After I had everything installed and turned it on, it just worked. It was honestly a little disapointing. I was looking forward to spending the afternoon working out kinks, or coming up with a neat solution. But it just worked. Exactly how it was supposed to. So then I spent the rest of the afternoon monitoring the humidity, but that was rather boring.

    The best thing about the unit is it keeps the temperature in my home really consistent from room to room. This is really just a side affect of it engaging the fan without the heat to add additional humidity. But through the process it circulates the air more and keeps my basement just a few degrees cooler than my main floor. I kinda like that. Plus now that the humidity in my home is above 16%, i can keep the thermostat set lower.

    Pros: Installed Easier than it looked, works well, automatic adjustment of humidity, Doesn't waste any water, circulates air in my home.

    Cons: Too easy to install. I was looking forward to a rigorous afternoon of troubleshooting and problem solving. But instead I had the whole rest of the day to my damn self.
    3 people found this helpful
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    Top reviews from other countries

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    Sailor
    4.0 out of 5 stars Great product but some recommended changes.
    Reviewed in Canada on January 21, 2024
    Style: HumidifierVerified Purchase
    Takes a fair amount of time to install. I put the outdoor temperature sensor in the fresh air inlet pipe for my HE furnace. I used a tee, some fittings and a valve for the water supply rather than the supplied saddle valve which is not reliable. The light aluminum foil bypass hose is very delicate and susceptible to damage. I used a sheet metal elbow and some much heavier flex hose. Works well with the temperature probe to prevent windows from having condensation when it is very cold outside.
    J.S.
    5.0 out of 5 stars Good price, timely deluvery
    Reviewed in Canada on November 27, 2023
    Style: HumidifierVerified Purchase
    This Aprilaire 400 arrived quickly and with no damage. One small 1/4 inch ferrule was missing but was easily acquired from a hardware store. The price was very competitive compared to other sources. Installation was not for the faint of heart but it is now installed and works perfectly.
    2 people found this helpful
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    Steve arbour
    1.0 out of 5 stars Correspond pas à ce que j’ai besoin
    Reviewed in Canada on November 2, 2022
    Style: HumidifierVerified Purchase
    Sur les photos, il me semblait parfait pour mon système central mais la sortie n’est pas du bon côté, pas comme sur les photos que je voyais. Je vous le retourne dans les jours qui suivent