Direct answer
Breville's current US Water Filters (6), model BWF100NA, explicitly lists the Barista Express BES870. The current US ClaroSwiss filter page, model BES008WHT0NUC1, does not list BES870, so do not substitute it on appearance alone. Before ordering, compare the filter already in your machine and follow Breville's instruction to check the machine batch code when needed.
Compatibility ledger
MODEL-SPECIFIC| Item or model | Fits | Verdict | Research note |
|---|---|---|---|
| Breville Water Filters (6) — BWF100NA | Barista Express BES870 / BES870XL | Fits | Breville's current US BWF100NA accessory page explicitly names BES870 among the compatible machines. |
| Breville ClaroSwiss Water Filter — BES008WHT0NUC1 | BES870 is not named on the current US compatibility list | Verify model | Breville lists other espresso models for ClaroSwiss but omits BES870. That omission is not proof of physical incompatibility; it means the current record does not verify this fit. |
| Generic listing described only as a 'Breville water filter' | Unknown until the listing names BES870 or BWF100NA | Verify model | A brand-level claim does not establish the filter shape, holder style or machine batch compatibility. |
| Espresso-machine descaler | Maintenance product, not a replacement water filter | Does not fit | Filtering and descaling are separate maintenance steps in Breville's instructions; descaler does not replace the in-tank filter. |
Match the model and the filter record
The current US Barista Express product page uses BES870, while US manuals and some listings may use BES870XL. For this filter question, Breville's current BWF100NA accessory record explicitly includes BES870. Copy the complete model from the machine label and compare it with the accessory listing before buying.
Check the installed filter and batch code
Breville warns that filter compatibility can depend on the machine batch code and tells owners to check the existing filter. Remove the water tank and inspect the filter holder and filter already installed. If their form differs from the BWF100NA listing, or the batch code is unclear, ask Breville support to confirm the exact replacement rather than forcing a similar-looking filter into the holder.
BWF100 and ClaroSwiss are not interchangeable claims
The BWF100NA page names BES870. The current US ClaroSwiss BES008 page names a different set of machines and does not include BES870. FitCheck Lab therefore records BWF100NA as the supported match and ClaroSwiss as unverified for BES870—not as a proven physical non-fit.
Replace it on the BES870 schedule
The US BES870 instruction manual says to replace the water filter every two months and more frequently in hard-water areas. For installation, it instructs owners to soak the filter for five minutes, rinse it under cold running water for five seconds, wash the holder, set the replacement date and lock the holder into the tank.
Evidence boundary
This guide compares current US Breville product pages and the official BES870 instruction manual. It is not a hands-on fit test, does not identify an unknown filter from appearance alone, and does not certify third-party filters that merely use similar wording.
PRIMARY SOURCES