OASE BioPlus Thermo 200 Internal Aquarium Filter with Integrated Heater for 208 L Tanks

The OASE BioPlus Thermo 200 is a corner-mounted internal filter for clear freshwater aquarium water, combining three-stage filtration with an integrated heater for tanks up to 55 gallons (200 L).

• Mechanical, biological, and chemical filtration — supports clear aquarium water through three filtration stages.
• Built-in heater with bi-metal technology and thermal shutoff — combines filtration and heating in one unit.
• Discreet corner-mounted design — keeps the filter positioned at the aquarium corner.
• Adjustable-flow diffuser — adds aeration and moves water across the surface.
• EasyClean magnetic catches and a 3-year warranty — simplify module removal and provide manufacturer-backed coverage.

For freshwater aquariums, this filter combines two pieces of equipment to reduce the need for a separate in-tank heater. Its filtration, heating, and flow features are designed to support aquarium upkeep while keeping equipment arranged in a corner.

How does the BioPlus Thermo 200 filter aquarium water?

It uses mechanical, biological, and chemical filtration, including 20 ppi filter foams and 30 ppi carbon filter foam. Together, these media provide the filter’s three stages for improving water clarity. The foam is held in individual modules, so each module can be removed for maintenance.

• 20 ppi foam provides part of the mechanical filtration.
• 30 ppi carbon filter foam is included as part of the chemical filtration stage.
• Biological filtration completes the three-stage system.

Does this internal filter also heat the aquarium?

Yes. The BioPlus Thermo 200 integrates a heater into the filter, reducing in-tank equipment and removing the need for a standalone heating unit. Bi-metal technology controls temperature, while a thermal shutoff provides a safety feature. The integrated heater also helps protect fish from direct contact with a heater element.

• Heating and filtration are combined in one unit.
• The thermal shutoff is part of the heater’s safety design.

How does the diffuser and adjustable flow work?

The integrated diffuser creates uniform movement at the water surface, adds aeration, and helps prevent biofilm formation. Its adjustable flow lets you tune water movement to suit the aquarium’s needs and aquascape.

• Adjustable flow helps tailor circulation within the aquarium.
• Surface movement supports aeration and helps prevent biofilm.

Which aquariums does it suit, and how is maintenance handled?

This model is intended for freshwater aquariums up to 55 gallons (200 L) and mounts inside the tank at a corner. EasyClean magnetic catches allow individual filter modules to be removed without disturbing the pump, making access to the filter foams straightforward during upkeep.

• Made in Italy and engineered in Germany.
• UL certified and backed by a 3-year manufacturer warranty.
• Good to know: the stated aquarium capacity is for freshwater tanks up to 55 gallons (200 L).

The OASE BioPlus Thermo 200 suits freshwater aquarium keepers who want filtration and an integrated heater in a discreet corner-mounted unit, with adjustable flow and removable filter modules for maintenance. Its three-stage filtration and built-in heater are designed for freshwater aquariums up to 55 gallons (200 L).