OASE BioMaster² Thermo 850 AU

The OASE BioMaster² Thermo 850 AU (94678) is a premium external canister filter designed for freshwater and marine aquariums up to 850 litres. Combining powerful biological and mechanical filtration with a built-in 400W HeatUp heater, this all-in-one filtration system eliminates the need for an in-tank heater, creating a cleaner aquarium appearance while maintaining stable water temperatures.

Featuring OASE's innovative EasyClean pre-filter module, maintenance is faster and easier than ever. Simply remove and rinse the pre-filter without dismantling the entire canister. The large 8-litre filter volume provides excellent biological filtration using Hel-X biomedia and filter foams, while the improved hydraulic design delivers a maximum flow rate of 1,500L/h for superior water circulation.

Engineered in Germany for quiet, energy-efficient operation, the BioMaster² Thermo 850 includes a self-priming button for easy startup, a secure shut-off valve system to prevent leaks during maintenance, and a modular media basket design for flexible filtration customisation.

Key Benefits

Suitable for aquariums up to 850 litres
Integrated 400W HeatUp heater reduces visible equipment inside the aquarium
EasyClean pre-filter module for quick maintenance
High-capacity 8L filter volume
Maximum flow rate of 1,500L/h
Includes Hel-X biological media and filter sponges
Self-priming button for fast startup
Leak-resistant shut-off valve system
Quiet and energy-efficient operation
Suitable for freshwater and marine aquariums
German-engineered for long-lasting reliability

Product Specifications

Brand: OASE

Model: BioMaster² Thermo 850 AU

Part Number: 94678

Maximum Aquarium Size: Up to 850L

Maximum Flow Rate: 1,500L/h

Maximum Head Height: 2.2m

Power Consumption (Filter): 32W

Integrated Heater: 400W HeatUp

Filter Volume: 8L

Pre-filter Volume: 0.6L

Hose Size: 16/22mm

Hose Length: 4m

Dimensions (L × W × H): 240 × 240 × 535mm

Power Cable Length: 1.5m

Suitable For: Freshwater and Marine Aquariums

Warranty: 3 + 1 years (subject to OASE warranty registration)

What's Included

OASE BioMaster² Thermo 850 Filter
Integrated 400W HeatUp Heater
Hel-X Biological Filter Media
Mechanical Filter Sponges
Carbon Pre-filter Foams
EasyClean Pre-filter Module
Hose Set (4m)
Inlet and Outlet Pipes
Spray Bar
Hose Adapter
Priming System
User Manual

Compatibility

Ideal for:

Freshwater aquariums
Planted aquariums
Tropical fish tanks
Marine aquariums
Reef systems
Large community aquariums

Compatible with 16/22mm aquarium tubing and genuine OASE BioMaster² replacement media and accessories.

Installation Tips

Position the filter below the aquarium water level.
Connect the supplied 16/22mm hoses to the inlet and outlet ports.
Install the filter media baskets and EasyClean pre-filter.
Fill the canister with water and use the integrated priming button to start the filter.
Set the desired water temperature using the integrated HeatUp heater.
Clean the pre-filter regularly to maintain optimal flow and extend the life of the biological media.
During maintenance, close the shut-off valves before disconnecting the hose adapter to prevent water leakage

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