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Tunze Osmolator Universal 3155
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Tunze Osmolator Universal 3155

In stock: Order by 2PM EDT for same-day shipping (M-F only)

Item #: TZ4111

MSRP: $271.99 Save: $62.00 (23%)
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TUNZE OSMOLATOR UNIVERSAL 3155 - auto top-off system Water level regulator with two sensor holding devices, extension and numerous fastening accessories. It is suitable for cabinet filter plants in TUNZE Comline filters or on the...
Product Description

Tunze Osmolator Universal 3155 Information

Product Manuals & Documentation

TUNZE OSMOLATOR UNIVERSAL 3155 - auto top-off system

Water level regulator with two sensor holding devices, extension and numerous fastening accessories. It is suitable for cabinet filter plants in TUNZE Comline filters or on the edge of the sump.

This osmotic regulator can also be used in TUNZE SYSTEM cabinet filter plants. The sensors can be stuck to glass surfaces or can be fitted directly to the edge of the tank.

In 1983 already, TUNZE Aquarientechnik introduced the first water level regulator (Osmolator) to aquarism. TUNZE Aquarientechnik has developed a new generation of osmotic regulators with static and compact sensors in IR technology for constant water level regulation in freshwater and saltwater aquariums. It ensures osmotic stability in freshwater and saltwater aquariums by precisely and regularly compensating the evaporated water.


Metering pump capacity: 2.95ft: 13.74gph, 4.92ft: 12.42gph, 6.56ft: 7.13h, Hmax: 7.22ft

Delivery condition: Ready for mounting with power supply unit, metering pump, hose, sensor holding device.
Metering pump capacity: 0.9 m: 52 l/h, 1.5 m: 47 l/h, 2 m: 27 l/h, Hmax: 2.2 m

(1) The precise water level is ensured by a non-wearing optical sensor and a transistor switch without any moving parts. This sensor is insensitive to soiling, light or magnetic fields.

Its “automatic eye” recognises the water level precisely, even small waves or level variations cannot irritate the unit.

(2) An independent safety sensor with a separate power supply circuit and relay control ensures reliable overflow protection.

(3) An electronic time controller and current limiter for the pump connected result in a higher operational safety. This unit protects the metering pump against running dry and reports an empty storage container.

(4) All functions are clearly displayed by LEDs; safety messages are also indicated by acoustic signals.

(5) The osmotic regulators are all operated at safety extra-low voltage.

What's in the Box

  • instruction manual
  • ac adaptor
  • 6 ft tubing
  • metering pump
  • float sensor
  • electronic water level sensor
  • controller
  • sensor mounting hardware


Manufacturer`s Warranty: 2 years from date of purchase.
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Tunze Osmolator Universal 3155 Reviews

Average Reviews

Customer Reviews

Stop manually topping off the Product Review by SCOTT DANIELS (Posted on 4/3/14)

Comments: The Tunze 3155 is in my experience the best ATO for the money hands down. Simple to set up with options for you to be able to customize your water leveling needs. I like that the unit comes with two sets of magnetic placements so if you want to have your emergency shut off in a different location then the inferred eye you can. I also like the pump chosen to go with the unit. Being that it is a bottom feed sump pump the water in your reservoir is almost always all used giving you more time before having to refill the backup water. Having a monitor that will show you when it's time to refill the reservoir is nice. Do I recommend this device? To people that do not like having to re-buy equipment due to parts failure or parts braking down over time then this is for you. For people looking to have the water level maintained accurately then this is for you. For people that want to dose Kalk with the top off water again I feel this is for you.

tunze osmolator Product Review by JOHN CRAWFORD (Posted on 2/26/14)

Comments: Easy to install. Works as stated. Awsome as always

To avoid any problems... Product Review by CARLOS A. (Posted on 2/26/14)

Comments: First, let me quickly say that if you are thinking about buying an auto-top-off system, the Tunze Osmolator is hands down the best one out there. I've tried just about all of them over the years and I've even made two of them myself using online kits. Save yourself the headaches and start off with the best. These are soooo well designed and engineered. They are a piece of cake to position, very adjustable, and they have plenty of backup features to make sure they don't fail.

OK, so how can there be a couple of bad reviews from folks who had problems with them? Simple. Please remember that when you install the outlet tube, where the water goes into your tank or sump, that it MUST BE ABOVE THE WATER LEVEL OF YOUR WATER STORAGE TANK. If you don't mount the tube above the water level of your water tank, then you risk creating a syphon which will drain your RODI water tank even after the osmolator shuts off. This is very, very important. I strongly suspect that the folks who had problems missed this very important point. As long as you install it right, it should run headache free.

Mine have been running for several years now and they are one of my few pieces of equipment that I don't have to worry about at all.

Two thumbs up!

Mounting Product Review by MARK WUESTENBERG (Posted on 2/26/14)

Comments: I also had a hard time with mounting this on my sump. What I did was us supper gel glue and mounted the brackets inside the sump wall. Just a suggestion if your having problems like I was.

AWESOME ! Product Review by JAMES FARRER (Posted on 2/26/14)


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