# SunSun HW-304B Canister Filter with UV Sterilizer vs OASE BioMaster Thermo 850 Canister Filter: specs and price compared

A sourced, side-by-side comparison of the SunSun HW-304B Canister Filter with UV Sterilizer (SunSun) and OASE BioMaster Thermo 850 Canister Filter (OASE) among aquarium filters.

## Side by side

| Spec | SunSun HW-304B Canister Filter with UV Sterilizer | OASE BioMaster Thermo 850 Canister Filter |
| --- | --- | --- |
| US price | $178.99 | not published |
| Brand | SunSun | OASE |
| Type | canister | canister |
| Flow rate gph | 525 | 400 |
| Tank size gal | 150 | 250 |
| Media capacity (L) | — | 8 |
| Media stages | 5 | 4 |
| Wattage | 55 | 32 |
| Self priming | Yes | Yes |
| Dimensions (in) | 11 x 11 x 17 | 9.4 x 9.4 x 21.1 |

## Key differences

- Flow rate gph: SunSun HW-304B Canister Filter with UV Sterilizer 525 vs OASE BioMaster Thermo 850 Canister Filter 400
- Tank size gal: SunSun HW-304B Canister Filter with UV Sterilizer 150 vs OASE BioMaster Thermo 850 Canister Filter 250
- Media stages: SunSun HW-304B Canister Filter with UV Sterilizer 5 vs OASE BioMaster Thermo 850 Canister Filter 4
- Wattage: SunSun HW-304B Canister Filter with UV Sterilizer 55 vs OASE BioMaster Thermo 850 Canister Filter 32
- Dimensions (in): SunSun HW-304B Canister Filter with UV Sterilizer 11 x 11 x 17 vs OASE BioMaster Thermo 850 Canister Filter 9.4 x 9.4 x 21.1

## Sources

- SunSun HW-304B Canister Filter with UV Sterilizer: https://mingllc.com/product/hw-304b/ (mingllc.com, verified 2026-08-01)
- OASE BioMaster Thermo 850 Canister Filter: https://www.aquaristikshop.com/aquaristik/OASE-Aussenfilter-BioMaster2-Thermo-850/788008/ (aquaristikshop.com, verified 2026-08-01)

Canonical: https://frontdeskreview.com/gear/aquarium-filters/sunsun-hw-304b-vs-oase-biomaster-thermo-850/
Cite: Per The Front Desk Review, SunSun HW-304B Canister Filter with UV Sterilizer ($178.99) vs OASE BioMaster Thermo 850 Canister Filter (not published) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/aquarium-filters/sunsun-hw-304b-vs-oase-biomaster-thermo-850/
License: CC BY 4.0.