What filter does a KZ 35-WZ take?
It takes the AprilAire Water Panel 35 — OEM part number 35.
KZ 35-WZ, whole-house humidifier, whole house.
Lowest verified price: $14.99 — 1 panel, genuine AprilAire #35 at HVACDirect. Shipping terms at checkout; HVACDirect listed 'call for availability' when checked. Checked 2026-11-11.
Buy the 35 on Amazon — 35Amazon search for the exact part number (no single listing is endorsed). Amazon price is shown on Amazon; we do not quote it here.
The part, in brief
| Part | AprilAire Water Panel 35 |
|---|---|
| Replacement interval | Replace at least once per heating season (AprilAire guidance via retailers; BestAir: 'Replace at least once per season'). |
| Per change | One panel per change. |
| Equivalents | BestAir A35 / A35W, BestAir Pro A35-PR, Honeywell HC26A1008 / HC26E1004 / HC26P1002, Lennox X2661, GeneralAire GA35 |
Verified prices
| Option | Price | Store & shipping |
|---|---|---|
| Genuine (OEM) 1 panel, genuine AprilAire #35 | $14.99 | HVACDirect Shipping terms at checkout; HVACDirect listed 'call for availability' when checked · Checked 2026-11-11 · source |
| Aftermarket 2-pack, BestAirPro A35-PR ($17.48 per panel) | $34.95 | DiscountFilters Free shipping on orders $70+ at DiscountFilters; a fee applies below that · Checked 2026-11-11 · source |
| Genuine (OEM) 2-pack, genuine AprilAire #35 | $44.95 | DiscountFilters Free shipping on orders $70+ at DiscountFilters; a fee applies below that · Checked 2026-11-11 · source |
| Genuine (OEM) 1 panel, genuine AprilAire #35 | $25.00 | Lakeshore HVAC Shipping terms at checkout · Checked 2026-11-11 · source |
| Also checked 1 panel, BestAir A35 (in-store, Boulder) | $15.99 | McGuckin Hardware In-store price · Checked 2026-11-11 · source |
Full record with every price, source and date: AprilAire Water Panel 35 page.