Aprilaire 600M Humidifier from Bypass - 17 GPD with Manual Humidistat

Aprilaire ByPass FlowThru Humidifier with Manual Control that humidifies up to 4,000 sq feet and disperses 17 gallons of water per day!

The Aprilaire 600M ByPass FlowThru Humidifier is a whole-home solution that helps homeowners reach their optimal indoor comfort through humidity control.


The 600M is designed to work in large to mid-sized homes, efficiently humidifying up to 4,000 sq. feet and dispersing 17 gallons of water daily.


This manual bypass unit mounts directly to the duct of your heating and cooling system, allowing the humidity to be placed directly into the airflow and distributed evenly throughout the home. It can be mounted on the supply or return duct (plenum) and is also easily reversible for right or left hand installation.

Additionally, this model will connect to a water line so you don't need to worry about filling it multiple times a day.


Benefits of Evaporative Humidification

  • Prevents Flu and Allergies
  • Neutralizes Static Electricity
  • Reduces Pet Dander and Discomfort
  • Protects Fine Furniture, Wood Floors, and Musical Instruments
  • Relieves Dry Skin and Scratchy Throats
  • Reduces Heating Costs


The Aprilaire 600M bypass humidifier is a manual humidifier, meaning that this unit does not come with a digital, automatic humidistat like the Aprilaire 600 Unit. It comes standard with an Aprilaire 4655 manual humidistat that can be wall or duct mounted on the return plenum of your unit. With this humidistat you will need to manually set and change the humidifier settings with any changes in the weather.


The Aprilaire 600M Humidifier is Shipped to you as a Complete System that Includes:


This humidifier requires a plenum opening of 10" W by 12 3/4" H.


For electrical reference, this unit operates on 24 Volts at 60Hz with a .5 AMP requirement.

*Important note: If the Aprilaire bypass 600M humidifier is installed on a heat pump system it is best to connect the unit to a hot water line.


Aprilaire recommends a #4839 maintenance kit be used each humidification season to ensure that your 600M humidifier is operating optimally. Furthermore, using a genuine Aprilaire #35 water panel is highly suggested. This water panel was designed specifically for the Aprilaire 600M humidifier and provides the most comfortable and efficient output. Don't trust the aftermarket products to provide the same quality and overall experience as the genuine #35 Aprilaire water panel.


How to Videos


Seasonal Maintenance 
Water Panel Replacement 
Aprilaire 600 Bypass Humidifier Overview
Aprilaire 600 Bypass Humidifier Maintenance
How to change the water panel on Aprilaire 600 humidifier


If you have any questions regarding this product, please use the HVAC.com Contractor Directory to connect with a trusted contractor in your area.

  • Brand: Aprilaire
  • Genuine OEM Product: Yes
  • Type: Bypass Humidifier
  • Control Type: Manual Non-Digital
  • Coverage: Up to 4,000 sq. ft.
  • Water Panel: Aprilaire #35
  • Evaporative Rate: .70 Gallons Per Hour
  • Feed Rate: 3 Gallons Per Hour
  • Bypass Diameter: 6"
  • Electrical: 24V - 60Hz - 0.5AMP
  • Product Measurements: 15.38" W x 15.75" H x 10.25" D
  • Plenum Opening: 10" W x 12.75" H
  • UL Listed: Yes
  • Contains: 24V Transformer, Manual Non-Digital Humidistat, Outdoor Temperature Sensor, Saddle Valve, 1 Aprilaire #35 Water Panel
  • This product comes with a 5 year limited manufacturer's warranty from the date of installation.
    Reviews Write a Review
    • Tony and Helen

      Bought it a couple of weeks ago and am completely satisfied.

    • Randy

      When we purchased our new furnace/AC unit we also had a whole house humidifier installed and it was an Aprilaire. Very happy with product, purchased one for our daughter's 1st home in 2008, this purchase is for her new home purchased in June 2012 since we have been so satisfied with your products.

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    Aprilaire 600M Humidifier from Bypass - 17 GPD with Manual Humidistat