Aprilaire Humidifier - Model 400

Need to maximize your humidity control with minimal water usage? The Aprilaire Model 400 Humidifier is the solution for you. The Model 400 is a drainless humidifier, featuring evaporative technology to minimize water use. 

Gravity pulls water down, while the wicking action of the Water Panel® draws it back to the top, using 100% of the water delivered to the unit.

The Aprilaire Model 400 Humidifier is a whole-home solution that helps you achieve total comfort through humidity control. The Model 400 features drain-free operation, eliminating standing water. This makes it the perfect choice for homes with septic systems, locations where a floor drain is not available or homeowners interested in water conservation. It is installed by a local HVAC professional.

Model 400 features:

 • Minimal water usage.
 • No drain required.
 • No standing water.
 Delivers optimum levels of humidity control with the Automatic Digital Humidifier Control. 

You never have to monitor your settings or wait until you feel uncomfortable.
 • Provides vital service, temperature and relative humidity indicators in manual mode as well.
 • Humidifies tightly constructed homes up to 4,000 square foot in size.
 • Has an evaporation capacity of 0.70 gallons per hour.

Reduces Airborne Viruses

Just the right amount of humidity can keep colds and flu at bay and reduces aggravating asthma symptoms.

Improves Energy Efficiency

Feel more comfortable at lower temperatures.

Protects Your Home

Aprilaire humidifiers deliver the perfect amount of humidity to protect your wood floors and furniture from dry-air damage.

Model 400 Parts


Aprilaire 400 Whole House Humidifier


Aprilaire 4004 In-Line Strainer for Humidifier Models 220, 224, 350, 360, 400, 400A, 400M, 500 Series, 600 Series, and 700 Series


Aprilaire 4040 Solenoid Valve, 24 Volt for Humidifier Models 400, 500, 600, and 700


Aprilaire 4231 Yellow Orifice for Humidifier Models 400, 500, 550, 558, 560, 568, 600


Other Aprilaire Humidifiers

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