Aprilaire - This replacement water panel evaporator fits models 500, 500A, 500M, 550, 550A, 558, 110 and 220. Water panel evaporators are the heart of your humidifier, designed specifically to deliver the proper humidity necessary to keep you comfortable throughout the heating season.
Water panel slides into the scale control insert, and the water distribution tray sits across the top of the panel
*Must purchase $100 to get 20% discount. Sale ends at midnight CST on Sunday, June 30, 2019. Limited quantities available. Excludes Milwaukee brand products. No rain checks allowed. Not valid on previous purchases.