Bunn
Coffee filters for the Bunn U3
Takes this filter
17¾ × 7¼ in451 × 184 mm · Flat-bottom basket
Wholesale only · made to order
We run this size to order for large-batch wholesale customers.
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Also listed as: 20500.0001 (120/240V), 20500.0000 (120/208V)
Bunn U3 specs
| Description | Twin automatic electric coffee urn |
|---|---|
| Capacity | 3 gal (11.4 L) per side |
| Electrical | 120/240V (20500.0001) or 120/208V (20500.0000) |
Specs from: commercial.bunn.com product listing (Oct 2026)
The Bunn 20109 filter and its other names
| Brand and part | Size | Also sold as | FLTR PUR |
|---|---|---|---|
| Bunn 20109 | 17¾ × 7¼ in451 × 184 mm | Wholesale only · made to order |
Brewers that take the same filter
More Bunn coffee makers
Questions and answers
What size coffee filter does the Bunn U3 use?
The Bunn U3 uses the Bunn 20109 (17¾ × 7¼ in, 451 × 184 mm) filter. FLTR PUR makes this size to order for wholesale customers.
Can’t find your brewer? Measure your filter.
- A · Flat diameter: lay one filter flat and measure edge to edge.
- B · Base: measure across the flat bottom of a formed filter.
- C · Wall height: measure the fluted side from base to rim.
Send us your size
Spot an error, or know a brewer we’re missing?
Every change is checked against the manufacturer before it goes live. A link to a manual, spec sheet or the brand’s own page helps most.
Brand names are trademarks of their respective owners, used only to identify compatibility. FLTR PUR is not affiliated with or endorsed by these manufacturers.