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Item #:
57124175
OASE BioMaster Thermo 850 External Aquarium Filter with Built-in Heater
97% of respondents would recommend this to a friend
Item #:
57124175
XAF 375810
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The OASE BioMaster Thermo 850 is a premium external filter with an integrated heater to reduce the amount of additional equipment seen in the aquarium, while providing precise and uniform temperature levels.
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What Stands Out
Integrated Heater
The BioMaster Thermo 850 uniquely combines filtration and heating in one unit, providing optimal water conditions while saving space and reducing equipment clutter in your aquarium setup.
Efficient Filtration
Designed for fish and plant health, this filter offers advanced mechanical, biological, and chemical filtration stages, ensuring crystal-clear water and a balanced ecosystem that enhances the well-being of your aquatic environment.
Easy Maintenance
With its innovative EasyClean technology, the BioMaster allows for hassle-free maintenance. The fast-access filter media makes cleaning and changing filters quicker, ensuring your aquarium remains healthy without the stress.
Product Details
- The OASE BioMaster Filter is a game-changer for aquarium enthusiasts, offering convenience and efficiency. Its unique EasyClean Pre-filter module allows you to quickly remove and clean it without having to disassemble the entire unit. This reduces maintenance time and boosts the filter's performance while prolonging the life of the main foams. The best part? Thanks to quicker and simple maintenance, you spend more time enjoying your beautiful aquarium! Even better, the BioMaster Thermo models come with a built-in heater that not only reduces clutter inside the tank, but it also keeps your aquatic inhabitants safe from direct contact with the heater. You can easily adjust the temperature between 66°F and 90°F and also calibrate within +/- 2°F. - ensuring the perfect environment for your fish. The BioMaster's four-stage filtration system guarantees crystal clear water, as it flows through various media, including activated carbon and OASE Hel-X Biomedia, creating an ideal habitat for beneficial bacteria. Safety is also a top priority, with secure locks and an aquastop feature that prevents spills during cleaning. Manufactured in Italy with German engineering, this filter quality is unmatched and OASE stands behind the quality of the product with a 4-year warranty (3 + 1 year when you register online). Included in the box are all the necessary accessories for your set-up, so you'll be up and running so you can enjoy your aquarium!
| Aquarium filter type | Aquarium Filter |
| Brand | OASE |
| Features | Chemical, External, Filtration, Mechanical, Multi-Stage, Quiet, Reliable |
| Power type | Corded Electric |
| Number of stages | 4-Stage |
| Assembled product height | 22 in (55.9 cm) |
| Rec. use | At-Home, Breeding |
| Accessories | Aquarium filter with an integrated heater, six carbon pre-filter foams, one 30 ppi filter foam, four 20 ppi filter foams, 2 units of Hel-X biomedia, intake tube with inlet strainer, water distributor nozzle, spray bar, inlet and outlet adapters with flow control, tubing, fittings, heater adapter, and power cables |
| Size descriptor | Large |
| Weight | 17.76 lb (8.06 kg) |
| Model | 77118 |
| Instructions | Instructions included |
| Has nrtl listing certification | N |
| Retail packaging | Kit |
| Count | 1 |
Who Should Buy?
-
Frequent Fish Keepers
Ideal for enthusiasts maintaining a healthy aquatic environment with efficient filtration and temperature control.
-
Aquarium Enthusiasts
Great for hobbyists who value advanced features like integrated heater and multiple filtration stages.
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Larger Aquariums
Suitable for aquariums up to 850 liters, ensuring proper filtration and heating for larger water volumes.
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Small Tanks
Not suitable for small aquariums, as it may be overkill for minimal filtration needs.
Product Description
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Customer Questions & Answers
-
Question:
What is the capacity of the OASE BioMaster Thermo 850 filter?
Answer: This filter is suitable for use in aquariums up to 225 gallons. -
Question:
How long is the warranty for this filter?
Answer: The filter is supported by an included 3 year warranty with a free 1 year warranty extension with online product registration. -
Question:
Can the pre-filter be customized and cleaned separately?
Answer: Yes, the EasyClean pre-filter can be customized with replacement foams and can be removed and cleaned separately from the rest of the filter.
OASE All Fish Tanks and Supplies Editorial Review
OASE BioMaster Thermo 850 External Aquarium Filter with Built-in Heater offers exceptional multi-stage filtration for large aquariums. This system features a 4-stage process that includes mechanical, chemical, and biological filtration, ensuring a clean and healthy environment for aquatic life. The built-in heater adds convenience, making it ideal for both at-home aquarists and breeding setups. Users appreciate its quiet operation and reliable performance, along with easy installation thanks to comprehensive instructions provided. The included accessories cater to various filtration needs, ensuring optimal water quality for your aquarium.
Customer Reviews & Ratings
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Pros
- Multi-stage filtration for effective cleaning
- Built-in heater for stable temperatures
- Quiet operation ensures a peaceful environment
- Comprehensive accessories included for convenience
- Suitable for breeding and at-home use
Cons
- Installation may take some time for beginners
Platform Trust & Buyer Confidence
JG
Jazz
Verified buyer
“Easy to use and always helpful and sorts any issues I've had past and present”
1 September 2026 · via Trustpilot
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“I always receive support when I engage customer service. Overall my experience with UBUY has been top notch. Keep up the good work.”
31 August 2026 · via Trustpilot
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“The delivery was fast and the product came undamaged and authentic.”
29 August 2026 · via Trustpilot
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“Ubuy is extremely efficient and to order online is an easy process. The verity of products to buy is really unlimited! My order was urgent and I got it on time. The products are great! Thank you Ubuy!”
25 August 2026 · via Trustpilot
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Hengo
Verified buyer
“Fast, convenient and cheap. Great store!”
27 August 2026 · via Trustpilot
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- Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
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XAF 375810
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Features & Benefits
- 4-stage filtration system for optimal water quality and clarity
- Customizable pre-filter with replacement foams
- EasyClean pre-filter for reduced maintenance and extended filter life
- Suitable for use in aquariums up to 225 gallons
- Energy efficient with 3 year warranty and free 1 year warranty extension
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