Trade Professional? Apply to become a TradeMaster!
Use Aprilaire Water Panel 45 to deliver the proper humidity to your home. Replace twice a season for peak performance. The Aprilaire water panel 45 fits the Aprilaire Humidifier 400, 400A, and 400M.

  • Water Panel 45 dimensions are 10" x 12-3/4" x 1-3/4"
  • Replace twice a season
  • Designed to last the entire heating season
  • Conveniently packaged in a 2 pack
  • Aprilaire engineered quality and reliability
Read more
Product Type:
Replacement Part
Speak with a real person who will go out of their way to help!
Call us 1-888-757-4774
Open Now:
Monday – Thursday
8am–7:45pm ET
9am–7:45pm ET

This item is compatible with the following Aprilaire model numbers.

Click on any model number to view complete parts list

warning icon  There are no compatible model numbers that match your entry.

Load More

Please note: Many replacement parts have subtle differences between them and can be easily confused. Attempting to install the incorrect part voids the return coverage. If you are not completely sure your order is correct please give us a call at 1-888-757-4774.

Need help finding a replacement part?

Fill out the part request form and someone will get back to you shortly.

Part request form

10 Product Reviews

Product Q&A

Add-on Item

This item is cost-prohibitive to ship on its own but is available to ship with orders over $200.

Why don't we show the price of this item?

We try to always offer you the lowest prices possible, but some manufacturers require that we only show these low prices once you take further action.

To see the price, simply add the item to your cart or sign in.