Model # HE280A

Internet #203479930

Store SKU #127580

Honeywell By-Pass Flow-Through Humidifier with Water Savings


By-Pass Flow-Through Humidifier with Water Savings

  • Water Saving Technology uses less water than standard humidifiers
  • PerfectFLO water distribution optimizes efficiency & water usage
  • Installation Kit included
$21800 /each
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Frequently Bought Together

Product Overview

The Honeywell HE280 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. This humidifier features water saving technology that uses 30% less water than standard models. Besides protecting your woodwork and furniture from drying and cracking. The humidifier can reduce the incidence of static electricity, promoting a safer home environment.

  • Replenishes moisture throughout the home to make it more comfortable
  • Water-saving technology and uses 30% less water than standard models
  • For typical homes (older than 20 years) up to 2,000 to (less than 20 years old) 4,000 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
  • Less maintenance and cleaning than portable units
  • Protects wood floors and furnishings from drying and cracking
  • 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
  • Click here for more information on Electronic Recycling Programs

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
Included Items
Installation Kit
Installation kit included
Product Weight (lb.)
Room Size (sq. ft.)
Whole House
Voltage (volts)
Water Filter Replacement Model#
HC26A; HC26P

Warranty / Certifications

Certifications and Listings
No Certifications or Listings
Manufacturer Warranty
1 year limited warranty

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Customer Questions & Answers

What is the water flow rate?

If set to the highest humidity level, what is the water usage in 24 hours?
Asked by: StansDIY
Turn a faucet on as little as you can for a steady flow. That's about it. When I was on city water I saw no difference in my bill. That makes sense as the unit only uses water when the furnace fan is running, not at all in the summer and none when the hunidistat setting has been reached. Taking a wild guess, maybe a gallon or so every 24 hrs? It's not much. The feed is just a 1/4" tube.
Answered by: Oldguy
Date published: 2016-11-12

How do I know if this humidifier is compatible with my furnace and do you recommend having a professional install it?

Asked by: Anonymous
If you're not comfortable with cutting holes in your ductwork or making water tight plumbing connections then you probably want a pro to do this. If you're pretty good with tools and have some experience with HVAC then go ahead. It's not rocket science, but needs to be done exactly according to the instructions. I've built houses before and this took me a long afternoon.
Answered by: Oldguy
Date published: 2016-09-19

Do you need to already have a humidistat in the house? or do you need to purchase one for this to...

Do you need to already have a humidistat in the house? or do you need to purchase one for this to work? Or does it have it's own sensor in it to tell it when to turn on and off?
Asked by: Angela
It has a sensor that connects to the return air to measure the humidity in the air. You can set it to the desired humidity. I included a picture of mine so you can see humidity adjustment switch. It is the white dial on the return vent on the right side I have a humidistat in my home but I don't use it. I just have adjusted the setting to where it feels comfortable in the house. It does not take long to notice the difference in the home.
Answered by: DYIADAM
Date published: 2017-02-04

Can this unit be turned around that the intake is on the left side. I have a gas pipe that will n...

Can this unit be turned around that the intake is on the left side. I have a gas pipe that will not allow this configuration.
Asked by: Poudrekeg
No it can not. The intake is only on the right side. I believe you can put the unit on the return air though. I don't think it has to go onto the furnace. I have included a picture of mine. I believe you can switch the humidifier and the return air hose and it still works the same.
Answered by: DYIADAM
Date published: 2017-02-04
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Customer Reviews

By-Pass Flow-Through Humidifier with Water Savings is rated 3.6 out of 5 by 27.
Rated 5 out of 5 by from I am enjoying the whole house humidifier. The static has been noticeably reduced in our home. Th... I am enjoying the whole house humidifier. The static has been noticeably reduced in our home. The installation was of the humidifier was not very complicated. I did watch a few youtube videos while researching this particular humidifier so I had a good idea of what I was needing to do. I would measure the surrounding area of where you would like to mount the unit to make sure it will fit. Installation took about an hour and a half. The humidifier has several settings, being in the midwest where it very dry during the winter we keep ours set to the ON position so it runs every time the furnace turns on. It is absolutly helping with static, dry skin and nose bleeds.
Date published: 2017-02-03
Rated 5 out of 5 by from Water saving feature having Excellent performance makes it a great... Water saving feature having Excellent performance makes it a great product.
Date published: 2017-03-01
Rated 1 out of 5 by from I bought the 240 but this is the same exact unit, just larger. Do not buy this humidifier. In fa... I bought the 240 but this is the same exact unit, just larger. Do not buy this humidifier. In fact, I wouldn't even buy any Honeywell products. Their customer service is atrocious. I purchased one, discovered parts were missing, returned it to the store to find all the others were missing parts but took one home anyway. I then ran around town buying replacement parts. Only when I set to work did I find that the missing parts were hidden within the humidifier itself; wish they would have mentioned that. So I cut a slew of holes in my ductwork, install this second one only to have the solenoid not function after four hours of work. I had to remove the entire thing and exchange it for another one at the store. After installing the third one, the solenoid did work but it would not stay open to let the water through. Honeywell agreed to pay for an HVAC contractor to come take a look. When the contractor arrived he first told me it should not be attached to the supply duct, which is where the directions tell you to install it. He then said the pressure switch (which is supposed to detect moving air then activate the solenoid allowing water to move through) would never work in any scenario. He said the bypass system is poorly designed and in fact, the whole system is poorly designed. Great. He ended up having to rewire the pressure switch to bypass it and wire the humidifier to the furnace. The more I studied the humidifier while the guy was there, the more I realized how poorly designed it is, how it would never work properly and do the job it's intended to do. But does it work? Does it provide humidity? Nope, not really. In fact, it has made no difference at all. Not satisfied, I contacted Honeywell again who gave me the run around for two more weeks before I finally spoke to someone who essentially blamed me for being smart enough to install one but too dumb to find all the information I needed. He said this humidifier is only expected to create 20-28% humidity at best. Why bother? That's what my house is at anyway. I asked him where that information was as I would have liked to have known that beforehand; he stated we don't like to flood customers with too much information or they won't buy the product and take the risk. He blamed me, blamed the store employees, the weather, every other variable in the book except his own product. Easy excuse for them -- it's everything else but our product. In the end, the only way to resolve this is either keep the thing, let it waste a ton of water and do nothing or return it and turn my ductwork into the Bride of Frankenstein by patching a million holes with bits of sheet metal. Did he offer anything? Nope, just a lame apology.
Date published: 2017-01-28
Rated 5 out of 5 by from Great do-it-yourself product The product was really easy to install with everything you need, obviously except tools, in the box. Make sure to read the box carefully before you purchase to make sure you have the clearance needed for installation. I am very handy and the entire job took about two hours to complete due to the directions being very easy to follow. I truly believe that anyone could install this product. I live in Michigan and when the temperature drops, the heat comes on and the house dries out. Once having the humidifier installed, there was a clear difference in my house by the next morning.
Date published: 2014-12-10
Rated 1 out of 5 by from I got a nearly empty box! Nearly all parts missing! I don't normally give bad reviews but I am really shocked. The box does not appear to have been opened. It appears to be factory packed but nearly everything is missing and of course Home Depot closed early today. Here is a list of missing parts. 1) Thermostat wire 2) Feed water tubing 3) Saddle Valve assembly 4) Transformer 5) Accessory Bag 6) Humidifier pad Basically I got an empty plastic shell , a paper mounting template, and some flexiblend ducting. If you buy one of these items I strongly recommend opening it and checking parts before you leave the store. Quality control appears to be non existent!
Date published: 2016-12-31
Rated 5 out of 5 by from Keeps the whole house comfortable This was a replacement for the non-water saving model, and was installed after replacing the entire HVAC system. The old model used an exorbitant amount of water and still couldn't keep the humidity level up. This model only runs a trickle of water and keeps the humidity at a steady 40 percent. Installation was very simple (easier than the first, since it used the same hole cut in the air duct). I can't understand why Honeywell (and Home Depot) still carry two models when this one works great and the other hardly works at all. This water saving version is definitely the one to buy whether you care about your water bill or not.
Date published: 2014-12-28
Rated 3 out of 5 by from Good product but wastes water unless you install a valce to reduce water flow. I selected this model as it claims 30% less water usage. The install went well and a youtube video shows install instructions which I preferred over the book. Make sure you have a 3/4 inch sheet metal bit to start your cuts and installing the sensor. I step down drill bit works well. I read a review about the water usage so I also installed a simple needle valve in the water feed line by the unit and this really reduced water waste. I like this unit over one the has a resevoir type as there is zero standing water which avoids mold growth. Take extra time an ensure its perfectly level as the water runs to the middle of the screen then down each side os if its not level you will waste more water. I think the claimed 30% reduction comes from the unit shutting off the water intermittingly while the furnace is blowing to reduce waste but I am not sure. It came with a 1/2 ID drain line which shows you how much water they allowed for on the discharge side. I am happy with the unit but do wish it came with a digital reading of the current humidity in the return air side so you know how well its working.
Date published: 2014-01-22
Rated 5 out of 5 by from Great product! We had an existing Honeywell humidifier on the furnace that stopped working (10 years old) instead of troubleshooting it was easier to buy a new one instead. The cutouts on the sheet metal were already there so that probably saved me an hour of measuring and cutting. Installation went very smoothly, parts are well laid out in individual bags. Easy to wire (the old one had to be wired to the furnace, this one is powered by a plug in AC pack). It was up and running in about 2 hours. Just make sure to double-check your connection on the water saddle valve and DO NOT over tighten (hand tight plus a 1/4 to 1/2 turn with a wrench.) Watch the the Honeywell installation video on YouTube, it's a huge help! Made a big difference in the air in our house, much more comfortable!
Date published: 2016-02-29
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