Overview The Tunze 3151 Osmolator 3 Nano is a compact auto top-off controller built for small to mid-size nano setups

It coordinates a single, reliable sensor with a low-voltage dosing pump to help maintain a steady water level, reducing evaporation-driven fluctuations

Designed for glass up to 12 mm thick, it pairs with a 3 m hose and comes ready to install with essential mounting hardware

This kit can be placed in a cabinet filtration area or mounted directly at the edge of the aquarium, providing flexible installation options that keep cables tidy and the display uncluttered

Why it matters In everyday use, stable water levels matter for consistent tank behavior and easier maintenance

The Osmolator 3 Nano emphasizes simplicity and safety: a single sensor minimizes setup complexity, while the included components support clean, unobtrusive installation

The system ships with a 12V power supply and all necessary fittings so you can get underway quickly, with the confidence that setup won’t disrupt your display

Key benefits and practical use cases Automatic top-off helps compensate evaporation in daily routines

Compact footprint makes it suitable for cabinet or edge mounting without crowding the tank

Glass compatibility up to 12 mm broadens placement options on many aquariums

Ready-to-install bundle includes a dosing pump, hose, holders, and a sensor cover for protection

Made in Germany with a focus on long-term reliability and a 5-year warranty

Designed for aquariums under 55 gallons, with built-in safety to prevent overflow on larger systems

What’s included 12V power supply Low-voltage dosing pump 3 m hose Hose holder Magnet mount suitable for up to 12 mm glass Protective cover for the sensor -world use Envision a neat cabinet setup where evaporation slowly lowers water level over the day

The Osmolator 3 Nano quietly rebalances the level, helping you maintain a visually stable display and fewer manual checks

While it’s designed with smaller tanks in mind, the safety features are there to prevent accidental overfilling in larger configurations

If you value a tidy, dependable topology for your nano aquarium, this device a practical, no-fuss approach to water-level management

FAQ Q: What size tanks is the Tunze 3151 Osmolator 3 Nano suitable for

A: Designed for smaller aquariums up to about 55 gallons (208 L), with safety limits to prevent overflow on larger setups

Q: What hardware comes with the Osmolator 3 Nano

A: Includes 12V power supply, low-voltage dosing pump, 3 m hose, hose holder, magnet for mounting, and sensor protective cover