Head to head

Fluval U2 vs Fluval U4

Our pick

Fluval U2

Internal Filters

Why this one

The Fluval U2 supplies filter media and adjustable flow for tanks within its stated 45 to 110 litre range.¹²

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Product photographs. Not to scale.

What Fluval U4 offers

The Fluval U4 extends the U series choice to tanks within its 240 litre rating, with adjustable flow rate and outlet direction.²³

2 models / at a glance

Key differences

Every specification ↗

Fluval U2

Fluval U2

Power draw · W5 W (Environment: 120 V / 60 Hz)²Lower preferred ↓

Fluval U4

Fluval U4

Power draw · W12 W (Environment: 120 V / 60 Hz)²Lower preferred ↓

What differs

Specification	Fluval U2	Fluval U4
Largest rated tank	110 l²	240 l²
Flow rate	400 l/h (Environment: 120 V / 60 Hz)²	1,000 l/h (Environment: 120 V / 60 Hz)²
Power draw	5 W (Environment: 120 V / 60 Hz)²	12 W (Environment: 120 V / 60 Hz)²

More details

Specification	Fluval U2	Fluval U4
Adjustable flow	Yes²	Yes³
Directional outlet	Not published	Yes³

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Sources