OASE FiltoSmart Thermo 300 – External Canister Filter with Heater (up to 300L)

Your tank is pushing 300 litres. Maybe it's a 200L you're running heavily stocked, maybe it's a proper 250–300L setup. Either way, you need real flow — and the FiltoSmart Thermo 300 delivers 1000 l/h without the bulk or the price tag of the BioMaster range.

It keeps everything that makes the FiltoSmart series good — EasyClick maintenance, locking inlet/outlet, self-priming, integrated heater — and scales it up to handle larger water volumes properly. Three-stage filtration covers mechanical, biological, and chemical. The flow is strong enough to circulate a 300L tank comfortably, and quiet enough that you'll forget it's running.

If you're deciding between this and the BioMaster 250 — the BioMaster wins on filtration depth and media capacity. The FiltoSmart Thermo 300 wins on price-to-performance if your tank is moderately stocked and you don't need the EasyClean pre-filter system.

This is the right filter if you have a 200–300L tank, want filtration and heating in one unit, and want strong flow without stepping into the premium price range.

• 3-stage filtration: mechanical + biological + chemical (carbon)
• 1000 l/h max flow
• 20W filter consumption
• Integrated HeatUp heater
• Carrying handle | EasyClick lid | locking inlet/outlet
• Self-priming
• Freshwater and marine compatible
• 3-year OASE warranty