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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
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Return this item for free
Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
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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 |
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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
- Best Sellers Rank: #934,490 in Home & Kitchen (See Top 100 in Home & Kitchen)
- #945 in Humidifiers
- Customer Reviews:
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
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 WellnessReduce airborne illnesses that can cause respiratory infections, asthma attacks, and allergic reactions by maintaining proper relative humidity in your home.*
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Lower Energy CostsHumidifiers can affect the "real feel" temperature in your home, which can prevent your furnace from working overtime. |
Home PreservationAir 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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Humidity for ComfortWhether 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. |
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 | |
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Customer Reviews |
4.3 out of 5 stars
308
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3.9 out of 5 stars
6
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4.5 out of 5 stars
1,745
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4.6 out of 5 stars
784
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4.5 out of 5 stars
1,101
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Price | $299.99$299.99 | $598.49$598.49 | — | $267.09$267.09 | $349.99$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
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Rotating Aprilaire Evaporative Humidifiers
Research Products Corporation
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How Dry is the Air in Your Home?
Research Products Corporation
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Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers 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
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
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
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
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
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
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
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
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
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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.
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.
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.