Oase BioMaster Thermo External Filters

4 reviews

The BioMaster can not only be conveniently concealed in the aquarium base cabinet, it is also easy to clean. The prefilter can be completely removed, simply rinse out and re-insert it - neat and clean thanks to the EasyClean prefilter module. The aquarium filter is available with or without the HeatUp adjustable heater.


  • BioMaster Thermo 250
    code: 42745 In Stock (Only 1 left!)
  • BioMaster Thermo 350
    code: 42746 Out of stock (Notify me
    More stock due in today
  • BioMaster Thermo 600
    code: 42747 Out of stock (Notify me
    More stock due in 4 days

Product Information

The BioMaster Thermo is an external filter for aquariums between 250 and 600 litres in size with high fish stock. It offers convenience for the most rigorous requirements.

These BioMaster Thermo external filters are packed with a combination of mechanical and highly effective biological filter media meaning a much larger surface area for bacteria to colonise resulting in cleaner clearer water. Replacement foams are available at Swell UK. The BioMaster Thermo ensures discrete highly efficient filter technology outside of your aquarium!

Included is all the filter media, hoses, adaptor, intake and outflow tube, as well as water diffuser. Suitable for both freshwater and marine aquariums and guaranteed for 3 years. The sister BioMaster is also available to buy from Swell UK.

Suitable Aquarium Size (Max.)Dimensions (LxWxH)Power Consumption Filter & HeaterGuaranteeMax. Flow RateMax. Head HeightHose (Qty/Lgth)Connection for hoses ø (inner/outer)Filter VolumePrefilter VolumeSuitable for FreshwaterSuitable for Saltwater
250250L240 x 240 x 370mm15 + 150w3 + 1 Years900 l/h1.3m1 Unit/4m16/22mm4.4l0.40lYesYes
350350L240 x 240 x 425mm18 + 200w3 + 1 Years1100 l/h1.4m1 Unit/4m16/22mm5.6l0.50lYesYes
600600L240 x 240 x 480mm22 + 300w3 + 1 Years1250 l/h1.8m1 Unit/4m16/22mm6.8l0.60lYesYes

Latest Customer Reviews

  • Rating
    Date 18/03/2020 20:03pm
    Oase BioMaster Thermo 250
    Feefo Logo
    Filter very good value and arrived on time
  • Rating
    Date 28/01/2019 08:01am
    Oase BioMaster Thermo 600
    Feefo Logo
    It’s a great filter. Very easy to set up and use.
  • Rating
    Date 22/10/2018 06:10am
    Oase BioMaster Thermo 250
    Feefo Logo
    Not yet installed but everything you want from an external filter
  • Rating
    Date 01/09/2018 06:09am
    Oase BioMaster Thermo 600
    Feefo Logo
    Easy set-up. So much easier to maintain than my previous unit. Very impressed.