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Model # HE240A

Internet # 203479938

Store SKU # 126729

Flow-Through Bypass Humidifier

This item has been discontinued.
The Home Depot no longer carries this specific product.

$198.00 /each
  • Replenishes moisture throughout the home for more comfort
  • Less maintenance and cleaning than portable units
  • Protects wood floors and furnishings from drying and cracking




Model # HE240A

Internet # 203479938

Store SKU # 126729

The Honeywell HE240 Flow-Through Bypass Whole House Humidifier works with your home's heating and cooling system to maintain a proper, comfortable humidity level throughout the home. Besides protecting your woodwork and furniture from drying and cracking. The humidifier can reduce the incidence of static electricity, promoting a safer home environment.

  • For typical homes (older than 20 yrs) up to 1,500 to (less than 20 yrs old) up 3,000 sq. ft.
  • Utilizes home's HVAC system for whole-home humidity distribution
  • Easy mounting on either warm air supply or return air duct of forced-air furnaces
  • Reduces static electricity
  • Saves money and energy because the improved humidity makes for a more comfortable home, the thermostat can be turned down a few degrees
  • Easy-to-use humidity control included
  • PerfectFLO water distribution tray optimizes efficiency and water usage
  • Home Depot Protection Plan:

    Home Depot Protection Plan

Info & Guides

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Maximum Room Size (cu. ft.) 
Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Air Treatment Product Type 
Whole House Humidifier 
Color Family 
Control Type 
Floor drain required 
Humidifier Features 
Automatic Moisture Control 
Humidifier Tank Capacity (Gallons) 
Humidifier style 
Bypass flow-through 
Included Items 
No additional items included 
Installation kit included 
Product Weight (lb.) 
9 lb 
Room Size (sq. ft.) 
Whole House 
Voltage (volts) 
Water Filter Replacement Model# 
HC22A; HC22P 
Warranty / Certifications
Certifications and Listings 
No Certifications or Listings 
ENERGY STAR Certified 
Manufacturer Warranty 
1 year limited warranty 


Rated 3.4 out of 5 by 11 reviewers.
Rated 5.0 out of 5.0 by Great humidifier, good value - preparation & patience are key So far I'm really pleased with the very noticeable over-night increase in humidity ~20% --> ~40%+. I decided to go with this model based on size,price, & features. Install overall took me about 6 hours. Most of that time was watching videos, reviewing instructions & planning! Remember (Measure x 3) = (Cut 1). Get familiar with tin snips! Wiring was easier since I could tap 24V side of furnace control board (R + C) - didn't need to run another 120V line nor use the included trans. Adjust water valve down to minimize excess. I added a 5-year ice-maker type filter on to mitigate sediment build-up. Seal her up good & get ready to breathe easy!! December 4, 2012
Rated 1.0 out of 5.0 by Don't Do It!!! I recently hired a Contractor to install a humidifier on my furnace. Given the configuration of my furnace, the humidifier had to go on the cold inlet side of the furnace. My Contractor suggested I have him install this model after doing some research and reading that this product can be installed in this configuration. I told him to proceed and he procured the unit from our local Home Depot store and installed the unit relatively easily, but he could not get water to flow to the filter media. After checking and rechecking every fitting, wire connection, and running through all of your trouble shooting tips, he was left without a cause as to why it would not operate. By all appearances the solenoid valve was not working. He called and consulted with one of Honeywell's service representatives on the phone and after a lengthy phone call, and again walking through all the trouble shooting steps, the service rep concluded that the solenoid valve must be faulty. The rep directed him to remove the unit, return it, and reinstall a different one as the remedy. My Contractor did this, and the new unit is suffering from the same malfunction. Again my Contractor spent several hours trying to trouble shoot the problem, verified that all connections have been property made. My Contractor again consulted a Honeywell rep who again concluded that a faulty solenoid must be the cause for the problem. I have now spent $400 in service fees to have the unit installed, uninstalled, and reinstalled, along with several hours of trouble shooting, and it is still inoperable. I did a bit of research on the internet and have come to learn that I am not the only one to experience a faulty solenoid. I filed a request for assistance with Honeywell explaining that I can not continue to fund returning and re-returning this product to the store in hopes that I get one that actually works. 11 days later, I received this utterly worthless response: "Please be advised that the limited retail product warranty that accompanies your HE240 Retail Humidifier is limited to receiving a warranty exchange or refund on a defective unit directly through the retailer where the product was purchased upon return of the unit in question together with proof of purchase. However, the decision to enlist the services of a professional contractor for assistance before, during, or after the install of the retail product shall be done at the sole discretion of the retail consumer irrespective of any potential product defect situation. Paul Arntzen Honeywell Customer Care Lead" Honeywell clearly has no confidence in their product and offers their customers no remedy for having purchased one (in my case, two) of their defective products. I strongly urge any potential buyers to pursue another, more reliable brand. December 23, 2014
Rated 4.0 out of 5.0 by Worth it to install it yourself. We bought this in November of 2013 in anticipation of a cold winter. YouTube has an excellent install video, just type in "Honeywell HE240". Watch the entire video before buying. The only difference between the video and our unit was the fact that all the wiring is HE280. There is no more differences. We have CPVC pipes, the included saddle valve is for copper. The plumbing department sold us a GATORBITE. I had to add a T to our pipes with some more 1/2" tubing. Pretty straight forward install. DO NOT USE A CONPRESSION FITTING ON CPVC, it cracks the plastic. Also bought some of the yellow (primer already in the glue) cement. I followed the recommendation of another review. We installed a ice maker water filter in the line and I slowly closed the water valve to reduce the waste to a trickle. Just keep closing the valve until the humidity falls off from your set value. Then just open it 1/8 turn. We bought a humidity sensor thing at Harbor Freight for cheap. Not only would I install this again but I recommended it to friends. Works great. January 14, 2014
Rated 4.0 out of 5.0 by Straightforward easy install After we determined that all the parts were included in the box, the installation was fast and easy. As others have pointed out it is important to have everything to do the install at hand. We could not find the bypass duct in the box and took it back to The Home Depot. They called Customer Care with us after they opened another box and did not find the bypass in that box either. They gave us the parts to complete the install. Wheh we got home and started the install, we removed the cover to the humidifier and found the duct and the remainder of the parts. It would be really helpful if this was noted in the inatallation pamphlet. After we determined that everything was there, it only took a couple of hours to cut the holes and install the humidifier and bypass duct. The instructions are very easy to follow. Any do-it-yourselfer shouldn't have a problem installing it. March 10, 2014
Rated 5.0 out of 5.0 by works perfectly I installed this from scratch.Easier to install since they use a vacuum switch now instead of wiring into the blower system.Piece of cake if you are a handy person.Simple wiring.Follow the directions it goes easy.You will need a sharp pair of tin snips and a 3/4 inch drill bit for the pressure switch.Unit operates great! December 20, 2013
Rated 5.0 out of 5.0 by Good product, easy install During the winter months my house has had very low humidity that drops as low as 22%. Humidity this low causes uncomfortably dry skin and static electricity (I was getting shocked every time I touched a light switch). I did some research and found this to be the best value solution. The humidifier comes with everything you need for the install (minus the tools) and even foil tape was included. There's a handy YouTube video by Honeywell that helps with the installation, although it took me 4 hours instead of the 1 hour they claim in the video and I consider myself handy. I have two furnaces (one in the attic and one in the basement) for my house which is approximately 3000 sq ft. I installed the humidifier above the A/C chiller box on the supply side on the basement unit because the attic has no easily accessible water supply. I have the humidistat set on 40%, but the humidity in the house doesn't seem to go above 35-38%. This is probably because the furnace is sized for half house so the air flow isn't sufficient to draw enough moisture into the air to get the humidity up for the whole house. Overall, I'm happy with the purchase and getting the humidity 10-15% higher in the house has made it much more comfortable. February 3, 2015
Rated 1.0 out of 5.0 by Installation is a hassle, output is poor. Pain to install. Supplied hardware doesn't grip the sheet metal very well. It is level and sealed to the supply duct but output disappointing. 2600 sq ft, 10 year old home and still need to use portable units to get humidity above 30%. Definitely not worth the cost, especially if you need to install power nearby and buy sheet metal tools to install it. December 31, 2014
Rated 1.0 out of 5.0 by Honeywell HE 280 humidifier I purchased the Honeywell H 280 humidifier and after 2 seasons the solenoid broke and I have to pay about half of the original price for a new solenoid. November 17, 2014
  • 2015-11-26 T12:15:33.586-06:00
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