Model # 12HF

Internet #202771119

Store SO SKU #1000801311

Hamilton Whole House Furnace Mount Flow Through Humidifier
0093645806243

Hamilton

Whole House Furnace Mount Flow Through Humidifier

  • Create a healthier environment with a whole house humidifier
  • Product sold without installation or permitting
  • Equipment should be sized/installed by a qualified professional
$147.30 /box

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Product Overview

Create a healthier environment and Increase the comfort of your entire home by installing the 12HF whole house furnace-mounted flow through humidifier. Having the proper amount of humidity in your home can help reduce respiratory infections, control static electricity, prevent house plants from wilting, and stop wood from drying out and cracking. You may also save money on your utility bill, as you can lower your thermostat and feel just as comfortable since humidified air feels warmer.

  • Uses up to 80% less water than other brands of whole house flow through humidifiers which will save you money on water and sewer charges from your municipality
  • Output of up to 13 Gal. per day for well insulated homes up to 3,000 sq. ft.
  • Lightweight housing design makes the humidifier easy to install on either the warm air supply or return air duct of any forced-air furnace
  • Everything needed for most typical installations is included
  • Evaporator pad is enclosed in plastic frame that ensures water flows through proper path for evaporation and makes it easy to replace
  • 24 VAC transformer simplifies installation as it plugs into a standard outlet and no hardwiring is required
  • Designed for use with all forced-air heating applications
  • Cut-out areas required for installation:humidifier housing: 8-1/4 in. H x 9-1/4 in. W
  • By-pass duct: 6 in. Dia
  • Humidistat: 3-1/2 in. H x 2-3/8 in. W
  • Equipment should be sized, selected and installed by a qualified professional to ensure proper installation, safe operation, adherence to federal, state and local codes and for valid warranty; see installation guide for more details
  • Recommended for professional purchase only
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Customer Questions & Answers

20 Questions22 Answers

Customer Questions & Answers

Whole House Furnace Mount Flow Through Humidifier
Whole House Furnace Mount Flow Through Humidifier

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2 answers

PEX Water Supply

This question is from Whole House Furnace Mount Flow Through Humidifier
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January 25, 2016
I only have PEX piping for my water supply in my home as it is new construction and this is all that was used. Am I unable to use the included water valve connection to connect my water supply? is there an alternative method I can use to make this connection?
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Answers (2)

February 7, 2016
Answer: 
You would need to use an adapter first before connecting to the water supply.
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January 26, 2016
Answer: 
If you have PEX, do not use the water supply valve that is included. I would recommend using a tee fitting, like those available from SharkBite that work with CPVC, PEX, and copper. Once the tee fitting is in place, you can plumb to a water supply shut-off that will accept the 1/4 in. water supply tubing included with the humidifier. Be sure to rough-up the first 1 in. of plastic tubing with sandpaper so Read More
If you have PEX, do not use the water supply valve that is included. I would recommend using a tee fitting, like those available from SharkBite that work with CPVC, PEX, and copper. Once the tee fitting is in place, you can plumb to a water supply shut-off that will accept the 1/4 in. water supply tubing included with the humidifier. Be sure to rough-up the first 1 in. of plastic tubing with sandpaper so that when the tubing with nylon ferrule is inserted into the compression fitting of the shut-off valve, the tubing does not slip. Read Less
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2 answers

Mounting on warm air plenum

This question is from Whole House Furnace Mount Flow Through Humidifier
Asked by
Los Angeles
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December 1, 2015
My furnace has the return air duct below the motor and the warm air plenum above it, so they are separated by a good 3 feet from each other.
I think in this case I need to install the humidifier on the warm air side, but will it work as well? What is the compromise if both the bypass and the unit are mounted on the plenum? Since there is no fan, I don't see how the air will go through the unit...
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Asked by
Central New York
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December 31, 2015
Answer: 
My installation required mounting the unit on the hot air plenum and feeding the air back to the cold plenum and it worked great. Rigid duct work was used instead of the supplied flexible duct. The air in the hot plenum is being forced and will try to escape through any opening. The cold air plenum is at a lower pressure and will draw the moistened air from the unit.
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December 4, 2015
Answer: 
The humidifier must be mounted such that it uses the circulation of the furnace, so the 6 in. bypass duct and the humidifier cannot both be mounted on the warm air supply plenum. Therefore, an extended bypass will be necessary for your application. Also, the humidistat must be mount on the cold air return side and the plenum controller must be mounted on the warm air supply side. Please give us call at Read More
The humidifier must be mounted such that it uses the circulation of the furnace, so the 6 in. bypass duct and the humidifier cannot both be mounted on the warm air supply plenum. Therefore, an extended bypass will be necessary for your application. Also, the humidistat must be mount on the cold air return side and the plenum controller must be mounted on the warm air supply side. Please give us call at 800-879-0123 if you have additional questions. Read Less
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1 answer

Why does the humidifier run all the time?

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Asked by
St. Charles MO
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September 22, 2016
Humidifier runs all the time

On your answer to this question you stated to place the electronic controller warm air plenum. On the instructions pictures it is placed on the cold air plenum. which should it be?
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September 23, 2016
Answer: 
This can be confusing since, in step 1 of the directions it mentions that the humidifier can be mounted on either the cold air return or warm air plenum. The picture in step 9 shows the electronic controller above the humidifier and located on warm air plenum, and the humidistat and bypass duct on the cold air return. This is more obvious when you look at the template sheet as it shows the basic set-up Read More
This can be confusing since, in step 1 of the directions it mentions that the humidifier can be mounted on either the cold air return or warm air plenum. The picture in step 9 shows the electronic controller above the humidifier and located on warm air plenum, and the humidistat and bypass duct on the cold air return. This is more obvious when you look at the template sheet as it shows the basic set-up for both high-boy and low-boy applications. If your unit will not shut off, the typical cause is that the dip switches are not in the proper position on the electronic controller. Please make sure that the 3/8 in. hole was drilled out where the electronic controller sit on the warm air plenum. The thermistor senses the heat in the plenum, and is how the controller activates and deactivates. Also, verify your wire connections are as pictured on the template sheet. There could be some other things we can have you check, but are easier if you can call us and be at the unit for troubleshooting assistance. If the controller is defective, and this turns out to be a warranty claim, we will assist you as such. The number to call us at is 800-879-0123. Hope this makes more sense now. Read Less
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1 answer

Will this unit hook up to my furnace in the basement and get the mostuire out of there or just my upstairs?

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September 1, 2016
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September 2, 2016
Answer: 
The 12HF is a humidifier and is designed to ADD moisture to your home during the months that the furnace runs and humidity levels are low causing uncomfortable dryness, static electricity, etc. Since this is a furnace mount unit, the humidity produced will be circulated when the furnace is cycling through the entire home via the duct work system. This unit will not function as a dehumidifier to remove Read More
The 12HF is a humidifier and is designed to ADD moisture to your home during the months that the furnace runs and humidity levels are low causing uncomfortable dryness, static electricity, etc. Since this is a furnace mount unit, the humidity produced will be circulated when the furnace is cycling through the entire home via the duct work system. This unit will not function as a dehumidifier to remove moisture. Read Less
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Customer Reviews

Rated 3.7 out of 5 by 18 reviewers.
Rated 1.0 out of 5.0 by When opened, parts were missing. The mfg did supply MOST missing parts in about 1 week. Then the directions were incomplete. This required another call to the mfg for instructions. After about 2 weeks of waiting and phone calls, it is finally installed. It is too early in the heating season to determine if it is working correctly. October 25, 2016
Rated 5.0 out of 5.0 by 100% satisfied Performs exactly as advertised, very quiet and does a great job moisturizing the air in my little 672 sq. ft. home. No significant increase in my water usage either. April 4, 2016
Rated 3.0 out of 5.0 by Works Great but the installation may need enhancements This humidifier would be rated 5 stars for an application that requires no adjustments to the supplied installation plans. My basic, forced air furnace is installed so that only one side of each vertical plenum is accessible. It was necessary to install the humidifier on the wide side of the hot air plenum and then use rigid 6” round duct work to feed the unit’s output into the horizontal cold air plenum. This unit is designed to fit the flexible duct that comes with it. The output port of the unit is much smaller than the female side of a 6” round duct so an adapter had to be fabricated. By hammering out the crimps of the male side of a 6” elbow, it then fit nice and snug onto the supplied plastic starter collar. During testing, the pulse module never came on in the normal setting. The “LO” setting worked but would continue to pulse water for 15 minutes after the furnace turned off. An outlet was installed on the side of the furnace for the unit’s AC adapter. This outlet was wired to toggle on and off with the furnace fan. I was then able to leave the pulse module setting on low with the unit automatically shutting down when the furnace fan turned off. The unit works perfectly now, but I feel installation enhancements such as this would be beyond the ability of many home owners. The media pads are not carried at Home Depot and must be ordered on-line. One pad should last an entire heating season. In summary, this type of humidifier, with a flow through water system, is the only kind to use. I’ve had plenty of bad experiences with the rotating drum, water bath, calcium clogged nightmare types to never go back. December 31, 2015
Rated 5.0 out of 5.0 by Great for price Humidifier works just as it should. Instructions are not very detailed but be sure to leave enough room for solenoid that mounts on top of humidifier before cutting into main supply. Had to adjust my hole a bit because there was not enough clearance near top main trunk. The plug in transformer could have been a little longer but with extra wire I was able to splice onto it. Be sure to call technician because the settings given in instructions are not correct. I have a high efficiency gas furnace and was told by the tech to put switch at low temp not high temp. When on high temp water valve (solenoid) kept opening supplying too much water when not needed. December 22, 2015
Rated 5.0 out of 5.0 by Great Product. I mounted it to the flex duct return. This is a great product. I read the reviews online and discovered the Honeywell model has issues, so I went with Hamilton. Very pleased and zero regrets. I have a 1,600 sq. ft. house and this unit can make the windows drip with condensation (I actually have to turn it down). No moving parts (except the water solenoid), no slimy drum to clean out, and best of all no humidifiers to refill. See the pictures, attached. The directions say it can be mounted to either the return or supply ducts at the furnace. I have a flex duct return, so I wanted the main body of the humidifier mounted to the solid surface of the supply duct. The directions did not describe this scenario, so I improvised. I hope the attached pictures and drawings help someone else in the same boat I was. I did have to install a 110VAC outlet for the power. However, I already had an existing drain (for AC condensation), for the drain tube. The unit works beautifully and no more dry skin. Great job Hamilton!!! December 12, 2014
Rated 4.0 out of 5.0 by Meets all expectations This was an exact replacement for the 20 year old original. I shorted out the solenoid on the old unit and replacement parts proved difficult to find. I bought the newest version of the same model and the frame fit the duct work cutout perfectly. This one has a timer module that wasn't part of the original install. While the old version would run water whenever it was on, most of it went to drain. The timer module passes just enough water to wet the pad. Very little is sent to drain. It seems to run about 3 seconds every minute when the humidity drops. December 15, 2015
Rated 3.0 out of 5.0 by All components Included Only had for a month, so hard to say how it is working. Easy install. December 31, 2015
Rated 5.0 out of 5.0 by Good Product I purchased this humidifier to replace an older Lasko unit that had failed after 10 years. This unit had a slightly larger footprint and installed easily. I already had the power, water, and drain setup so install was a snap. It comes with everything necessary down to the saddle valve for supply and hose to connect to the drain. It makes an odd sound when the solenoid valve opens but other than that is completely quiet. It also includes a damper for tool free seasonal transitions. I purchased an additional wick to save searching for one later. The difference in the house is amazing. Cats are much happier. March 4, 2014
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