Honeywell Flow-Through Bypass Humidifier-HE240A at The Home Depot


Model # HE240A

Internet # 203479938

Store SKU # 126729

Flow-Through Bypass Humidifier

Honeywell 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


Air Treatment Product Type  Whole House Humidifier  Assembled Depth (in.)  9.47 in 
Assembled Height (in.)  15.3 in  Assembled Width (in.)  15.72 in 
Certifications and Listings  No Certifications or Listings  Color Family  Whites 
Control Type  Mechanical  ENERGY STAR Certified  No 
Floor drain required  Yes  Humidifier Tank Capacity (Gallons) 
Humidifier style  Bypass flow-through  Included Items  No additional items included 
Installation kit included  Yes  Manufacturer Warranty  1 year limited warranty 
Product Weight (lb.)  9 lb  Returnable  90-Day 
Room Size (sq. ft.)  Whole House  Voltage (volts)  24 
Water Filter Replacement Model#  HC22A; HC22P 


Rated 4.1 out of 5 by 7 reviewers.
Rated 5 out of 5 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 5 out of 5 by Great Humidifier and easy to install ! I am very happy with my purchase and would reccomend it to a friend , I have nothing but good things to say about Home Depot ! August 19, 2014
Rated 4 out of 5 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 4 out of 5 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 5 out of 5 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
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