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Aprilaire 400M

Whole-House Evaporative Bypass Humidifier - Manual

SKU : 400M
Aprilaire 400M - Whole-House Evaporative Bypass Humidifier - ManualAprilaire 400M - Whole-House Evaporative Bypass Humidifier - Manual
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About this Item

Whole-House Humidifier, 24V Whole House w/ Manual Control, 0.7 gal/hr
This item has been retired by the manufacturer and is no longer available. You may find similar products by viewing our selection of Humidifiers below.
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Product Highlights

Aprilaire 400M - Whole-House Evaporative Bypass Humidifier - Manual

The Aprilaire Model 400 Humidifier offers homeowners a great solution for humidity control throughout their entire home. This system is a drain-less humidifier, featuring evaporative technology to minimize water use.

The 400 uses gravity to pull water down, while the Water Panel® wicks water away and draws it back to the top, therefore using 100% of the water delivered to the unit.

This Aprilaire 400 will humidify tightly constructed homes up to 4,000 square feet in size.

  • No drain required
  • No standing water
  • Minimal water usage - great for areas with water limitations or restrictions!
  • Automatic Digital Humidifier Control allows for easy humidity control
  • Provides vital service, temperature, and relative humidity indicators in manual mode as well
  • Evaporative capacity of 0.70 gallons per hour

Give your family full comfort at home and a break from the unhealthy and damaging effects of overly dry air. Get the Aprilaire Model 400 Humidifier!

Will mold grow inside my humidifier?

Aprilaire evaporative humidifiers are designed to prevent microbial growth. Even the Water Panel in the Model 400 is treated with an anti-microbial agent. Most importantly, the drain-through technology in the Aprilaire humidifiers leaves no standing water when the humidifier turns off. This leaves all surfaces dry between humidification cycles, meaning there is no moisture for microbial growth.

Is there a warranty for this?

Yes! Aprilaire humidifiers are backed by a 5-year limited warranty on parts. This is from the date of installation, and the system must be installed by a licensed HVAC installer to validate the warranty.

How do I know when my humidifier is operating?

The Aprilaire 400 is designed only to bring the humidity levels up to 45%. If the humidity in your home is higher, the humidifier will not run. If you turn your humidistat from 15% to 45% and the humidifier does not run, this verifies the humidity is higher than 45%. One the humidity level drops, the humidifier should operate any time the furnace is producing head and the indoor relative humidity is less than the set point on your humidistat.

Will a humidifier harm my heating and cooling system or air cleaner?

Aprilaire humidifiers are an evaporative-style humidifier. Unlike misting or atomizing humidifiers which put water droplets into the air stream, Aprilaire humidifiers use a natural evaporation process to generate humidity. The humidity created is a gas which simply passes through any component in the heating and cooling system or any air cleaner including an Aprilaire air cleaner with no adverse effects. The humidity created by your Aprilaire humidifier is no different than the humidity present in your home during the summer months.

How often do I need to change my Water Panel®?

To ensure peak performance the Water Panel® should be replaced twice a season. Over time, the wicking capabilities (ability to draw water up the Water Panel® are reduced as minerals build up on the panel. The mid-season change means you will receive proper humidity throughout the humidification season.

Manuals & Docs

Aprilaire 400M - Whole-House Evaporative Bypass Humidifier - Manual
Weight 9.4 Pound (lb.)
Height 11.75 Inches (In)
Width 17.25 Inches (In)
UPC 686720404009
Length 18.25 Inches (In)
Brand Aprilaire
Voltage 24 VAC
Amps 0.03-0.05
Phase Single
Cycle/Hertz 60
Color White
Type Humidifier
Energy Star Rated No
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