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Tunze Nano Osmolator Auto Top Off with 7.1 Gallon ATO Reservoir


Item #: TZ41141

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Tunze Nano Osmolator Auto Top Off with 7.1 Gallon ATO Reservoir


Tunze Osmolator Nano 3152 Auto Top Off ATO

The Tunze Nano Osmolator 3152 is a water level controller with only one sensor, and works great for nano or small aquariums.
  • Great for nano aquariums and tanks up to 55 gallons
  • Ready for installation out of the box
  • Can be installed in a cabinet filter or directly on the aquarium edge
  • Safe low voltage construction
  • Includes a metering pump, 3 meters of tubing, magnet holder, power supply, a float switch, protective shield and control unit.
  • Suitable for aquariums up to 10 mm (0.39") thick
For safety purposes, the Osmolator 3152 includes a processor-based anti-overfill system which turns the pump off after five minutes of filling if the level has still not been reached (equal to a pumping of approximately 0.75 gallons).
The Tunze Nano Osmolator 3152 was built in Germany and includes a 2-year manufacturer warranty that excludes the float switch—which features a 6-month manufacturer warranty and is user replaceable.
For larger aquariums, check out the Tunze Osmolator Universal 3155. If you need a container to hold your top off water, the Tunze Osmolator Storage Container 5002.25 is an ideal choice.

Tunze Osmolator Storage Container 27L (7.1 Gal) 5002.250


  • Container with a capacity of 27 L (7.1 gallons)
  • Large cover opening to facilitate topping up and cleaning
  • Size for an open 600 l tank: fill lasts for approx. one week ø 34 x 43.5 cm
  • For use with Tunze Osmolator / Osmomat and Calcium Dispenser

Manufacturer information

For forty-five years the name TUNZE® has been synonymous with aquariums. Many products and components which we have developed in the course of time are now standard features of aquarium technology today. This confidence in TUNZE is no coincidence. The company has remained true to its philosophy right from the beginning, researching water biotopes all over the world to develop components which enable natural water conditions in the closed environment of an aquarium. In the implementation of know-how, effectiveness and efficiency, TUNZE® takes the lead in environmental compatibility. Their motto is: quality and reliability. These values are upheld with well thought-out and precise tool making by highly qualified experts. The brand names of TUNZE® and Turbelle® meet the expectations of the seal of quality; Made in Germany. Many of the products shown in this catalogue are protected by national and international patents.

5 Stars


Reviewed on
June 09, 2020

Yes, I would recommend this.

Easy setup and works great.

Pros: Easy setup; works great; saftey shutoff

Cons: None so far.

This is so easy to setup and use. I didn't really think I needed an ATO until I got this. It has maintained my water level consistently with no issue. And the safety shutoff gives me peace of mind. I would definitely recommend this.

Was this review helpful? 1 0


Reviewed on
May 21, 2019

Yes, I would recommend this.

Auto fill

Pros: Simple install

Cons: None yet

Simple install and works perfectly on my 45 gallon. With a auto fish feeder now I can go away for a weekend with ease.

Was this review helpful? 0 1

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