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AprilAire · humidifier · whole house bypass

AprilAire 558 replacement filter

Use part 10. Replace at least once a year (manufacturer owner's manual).

The filter that fits

Maker lists this model

AprilAire Water Panel 10

AprilAire 10 Replacement Water Panel

Part number
10
How many
1 per unitpacks: 10 02 (2), 10 04 (4), 10 10 (10)
How often
Replace at least once a year (manufacturer owner's manual)
Size
10 x 10 x 2 in10 x 10 x 2 in nominal (9.75 x 9.5 x 1.75 actual)
Buy Water Panel 10 on AmazonManufacturer page

Opens an Amazon search for AprilAire Water Panel 10. Check the listing says 10.

See the sources

Look-alike models that take a different filter

The 560 and 568 take panel 35, not panel 10.

Other genuine options from AprilAire

Variants and kits the maker sells for this model. Same fit, different media or packaging.

  • AprilAire 4793 Maintenance Kit with 10 Water Panel
    4793 · Find on Amazon

Compatible alternatives (third party claims)

These fits are claimed by the seller, not by AprilAire. We list them for completeness and label them.

  • GeneralAire GA10 Third party claim
    GeneralAire says its GA10 Vapor Pad fits AprilAire models 110, 220, 500A, 500M, 550, 550A and 558
    Seller's page
  • Lennox X2660 Third party claim
    Lennox says its Healthy Climate #10 water panel X2660 also replaces AprilAire #10 in models 110, 220, 550, 550A and 558
    Seller's page

Sources

High confidence: the manufacturer names this exact model on a live page. Each line is the page we read and the day we read it.

  • Which filter fits shop.aprilaire.com Maker's own page checked Oct 1, 2026
    AprilAire 10 Replacement Water Panel For 110, 220, 500, 500A, 500M, 550, 550A, and 558 Whole-House Humidifiers ... Compatible Models: 110, 220, 500, 500A, 500M, 500MKZ, 500KZ, 550, 550A, 558
  • How many appliancefactoryparts.com Maker's own page checked Oct 1, 2026
    AprilAire owner's manual B2203620A for Models 110, 112, 220, 224, 350, 360, 440, 445, 448, 558, 560, 568, 760 & 768, dealer-hosted copy (Appliance Factory Parts), PDF p19 (Models 558-560-568): 'Slide the Water Panel evaporator (7) out from the plastic Scale Control Insert ... substitute a new one'
  • How often storage.googleapis.com Maker's own page checked Oct 1, 2026
    AprilAire owner's manual B2209190D (09.23), dealer-hosted copy, PDF p8: 'we recommend that you replace the Water Panel in your AprilAire Humidifier at least annually with the exception of Models 400 and 400M'
  • Size shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Materials: Aluminum, Synthetic Fiber Nominal Measurements: 10H x 10W x 2D (inches) Actual Measurements: 9.75H x 9.5W x 1.75D (inches)
  • Packs shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Package Size 1-pack, 2-pack, 4-pack, 10-pack; SKUs '10', '10 02', '10 04', '10 10'
Show all 10 sources

Which filter fits

  1. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    AprilAire 10 Replacement Water Panel For 110, 220, 500, 500A, 500M, 550, 550A, and 558 Whole-House Humidifiers ... Compatible Models: 110, 220, 500, 500A, 500M, 500MKZ, 500KZ, 550, 550A, 558
  2. appliancefactoryparts.com Maker's own page checked Oct 1, 2026
    AprilAire owner's manual B2203620A for Models 110, 112, 220, 224, 350, 360, 440, 445, 448, 558, 560, 568, 760 & 768, dealer-hosted copy (Appliance Factory Parts), PDF p11: 'For Models 220, 224, 440, 445, 448, 558, 560, and 568 close the bypass damper in the bypass pipe'
  3. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    AprilAire 10 Replacement Water Panel
  4. appliancefactoryparts.com Maker's own page checked Oct 1, 2026
    AprilAire owner's manual B2203620A for Models 110, 112, 220, 224, 350, 360, 440, 445, 448, 558, 560, 568, 760 & 768, dealer-hosted copy (Appliance Factory Parts), PDF p14: 'replace with a new Water Panel evaporator (Stock No. 10 for Model 220 and Stock No. 12 for Model 224)'
  5. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    INCLUDED IN THE BOX: 500 Humidifier ... Model 10 Water Panel
  6. appliancefactoryparts.com Maker's own page checked Oct 1, 2026
    AprilAire owner's manual DP #10003882 (5.9.00) for Models 550 and 560, dealer-hosted copy (Appliance Factory Parts), PDF p12: 'Water Panel evaporator (Stock No. 10 for Model 550 and Stock No. 35 for Model 560)'

How many

  1. appliancefactoryparts.com Maker's own page checked Oct 1, 2026
    AprilAire owner's manual B2203620A for Models 110, 112, 220, 224, 350, 360, 440, 445, 448, 558, 560, 568, 760 & 768, dealer-hosted copy (Appliance Factory Parts), PDF p19 (Models 558-560-568): 'Slide the Water Panel evaporator (7) out from the plastic Scale Control Insert ... substitute a new one'

How often

  1. storage.googleapis.com Maker's own page checked Oct 1, 2026
    AprilAire owner's manual B2209190D (09.23), dealer-hosted copy, PDF p8: 'we recommend that you replace the Water Panel in your AprilAire Humidifier at least annually with the exception of Models 400 and 400M'

Size

  1. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Materials: Aluminum, Synthetic Fiber Nominal Measurements: 10H x 10W x 2D (inches) Actual Measurements: 9.75H x 9.5W x 1.75D (inches)

Packs

  1. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Package Size 1-pack, 2-pack, 4-pack, 10-pack; SKUs '10', '10 02', '10 04', '10 10'