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Aprilaire 400M Drainless Bypass Humidifier (Manual Control)

Take control of indoor humidity in your home with the Aprilaire 400M drainless bypass humidifier! The Aprilaire 400M maximizes humidity control by using minimal water usage. Using evaporative technology, the Aprilaire 400M drainless bypass humidifier can humidify a tightly-constructed home of up to 4,000 square feet. The Aprilaire 400M Humidifier features a unique water-conserving design that does not require a drain line. The evaporative capacity of the Aprilaire 400M supports up to 17 gallons per day.

The Aprilaire 400M is a whole-home solution to aid you in controlling the humidity in your home through a manual humidistat control. The water panel in the Aprilaire 400M performs a wicking action to draw water back to the top after gravity pulls water down. This allows the Aprilaire 400M to use 100% of the water supplied to the humidifier. With the use of the drainless bypass, there is no standing water with the Aprilaire 400M humidifier. The Aprilaire 400M drainless bypass humidifier is ideal for:

  • Homes without a floor drain
  • Homes with septic systems
  • Homeowners concerned about water conservation

The Aprilaire 400M Humidifier includes a built-in bypass damper that is conveniently labeled for winter and summer settings. The Aprilaire 400M comes complete with the Aprilaire non-digital humidity control, one Aprilaire water panel, saddle valve, 24V transformer, and installation instructions from Aprilaire! Add the Aprilaire 400 Humidifier Annual Maintenance Kit to your order! This convenient kit gives you all the parts you need to maintain your Aprilaire 400M humidifier each year and keep it running in like-new factory condition.

Additional features of the Aprilaire 400M include:

  • Evaporative capacity of 0.70 gallons per hour
  • Provides relative humidity, temperature, and service indicators
  • Eliminates standing water in the unit
  • Minimum water use
  • Drain free capable
  • Automatic Digital Humidifier Control delivers prime control of humidity levels

If you have any questions regarding this product, please feel free to email or call 1-888-623-4678, and one of our knowledgeable Customer Experience Representatives will be happy to help.

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