What filter does a Bionaire W-15 take?
It takes the Holmes HWF75 Filter (Type D) — OEM part number HWF75.
Bionaire W-15, evaporative humidifier, tabletop.
Lowest verified price: $29.95 — aftermarket, 2-pack at DiscountFilters. Free shipping on orders $70+ at DiscountFilters; a fee applies below that. Checked 2026-11-11.
Buy the HWF75 on Amazon — HWF75Amazon 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 Amazon price is shown on Amazon; we do not quote it here.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 | Holmes HWF75 Filter (Type D) |
|---|---|
| Replacement interval | Replace every 1–2 months in season (general Holmes wick guidance). |
| Per change | One filter per change on most models. |
| Equivalents | BestAir / BestAir Pro H75 / H75-C, DiscountFilters (AIRx) HWF75 replacement, BestAir ALL-2 |
Verified prices
| Option | Price | Store & shipping |
|---|---|---|
| Aftermarket 2-pack | $29.95 | DiscountFilters Free shipping on orders $70+ at DiscountFilters; a fee applies below that · Checked 2026-11-11 · source |
| Also checked 4-pack | $49.95 | DiscountFilters Free shipping on orders $70+ at DiscountFilters; a fee applies below that · Checked 2026-11-11 · source |
| Also checked 6-pack | $64.95 | DiscountFilters Free shipping on orders $70+ at DiscountFilters; a fee applies below that · Checked 2026-11-11 · source |
Full record with every price, source and date: Holmes HWF75 Filter (Type D) page.
Finding the model number on a Bionaire
Model numbers are on the bottom label, starting with 'BCM' or 'BWF'. Bionaire shares Holmes wick fitments.