The Tunze Osmolator Nano 3152 Auto Top Off is designed for smaller tanks, approximately 50 gallons and under. One of the safest ATO’s available. Utilizes a single sensor to monitor water levels and a controller that protects against overdosing.
- Magnetic holder for sensors up to 10mm or .39".
- Max Head Height: 7.0 ft
Introducing the little brother to the Tunze Osmolator, one of the industry’s most trusted automatic water top-off device and BRS Recommended. Designed specifically for smaller aquariums, roughly 50 gallons and under, the Osmolator Nano 3152 is a slimmed down version of the full sized 3155. It includes a processor-based anti-overfill system which turns the pump off if after five minutes of filling the level has still not been reached. The Osmolator Nano includes the control unit, low voltage (6V) pump, power adapter, 3m hose, magnet mount and protective cover.
Very unstable By ReeferJoe on 7/28/2018ReeferJoe wouldn't recommend this product to a friendThe pump coughs, meaning it wouldnt pump out water and eventually you run dry. One remedy is to unplug and plug back but that defeats the purpose of the Automation procedure. Buying this is a major disaster in the making.
Great system for price By Dustin on 6/30/2018Dustin would recommend this product to a friendI've had this for over a year and it's worked great. I only had one failure where there was build-up on the float and it didn't drop and let the pump turn on. Moral is, clean the pump and float every couple of weeks and it works as intended.
Buy the 3155 model vs the 3152 model By Seacreature on 5/28/2018Seacreature wouldn't recommend this product to a friendDon’t waste $ on the 3152. The 3152 is unreliable. Works for about 3 days then the pump needs to be primed again. I also have the 3155 and it has consistently worked as design. Not sure if it is because of the eye or the controller since both models supposedly use the same pump.
Work great for a while, then all kinds of errors By Ben on 3/4/2018Ben wouldn't recommend this product to a friendThese work great for a year or so and then you'll be constantly unplugging and plugging them back in because the sensor is not working. Next you'll be manually fiddling with the sensor itself because for some odd reason it doesn't like to trip the pump even when the magnetic sensor is clearly in the correct position for it to turn on.
I've had this overflow my JBJ 28g nano in our bedroom more than once. Luckily the noise of a constantly running pump wakes me up to unplug. After that I get to wait for the extra gallon of water to evaporate so I don't screw up my SG.
I wouldn't buy one of these again.
2 units both failed By Brandon from The Bay on 2/21/2018Brandon from The Bay wouldn't recommend this product to a friendI have 2 of these nano's and also a regular 3155. I had high hopes for the nano but both failed and in different ways. usually it's the float that gets stuck in the down position, other times it's the run timer that doesn't function as it's supposed too, overfills the tanks, runs the reservoir dry and either burns up the pump or runs for hours on end til I come home. One unit overfilled my 10g nano tank by 5 gallons and you can imagine the devastation that this caused to the our loft cabinets. (wife wasn't happy either). I love these at first, due to simplicity and the normal Tunze product love but these units are seriously flawed. I highly recommend you buy the full size 3155 over the nano's (never had an issue with the 3155 ever). You get what you pay for. I waited too long to return these and I'm out the cash but hey lesson learned right oh and my cabinet guy really loves me right now too. BRS really should stop carrying these until a proven fix or revised product is put in it's place.
No muss, no fuss, just works. By Old Salt on 2/19/2018Old Salt would recommend this product to a friendSimple ATO for smaller tanks. Has built-in overflow protection. I have it on an office tank which is unattended on weekends. No problems yet.
Not a long term solution. By Brandon on 12/26/2017Brandon wouldn't recommend this product to a friendI own 2 of these units. Both are on nano sized tanks. One unit overfills constantly (apex set run times fixes this but that’s not the point). The other unit doesn’t shut off if the reservoir is empty. (Again using another apex to set run times saved a few pumps). Either way. Both units worked great for a few months. My other big tunze osmolator has been running flawlessly for years. Tunze dropped the ball on the nano version.
A quality system from Tunze By Jinenon on 12/11/2017Jinenon would recommend this product to a friendI don't know why so many people are having the "reset" problem. I have a feeling it's user error more than the equipment. I have had this setup for 9 months now and it has never, even once, had a hiccup. Has worked flawlessly. The safety features have worked flawlessly when I forgot to turn the ATO off during water changes. Great product and decent price!
Working great By Donald on 11/9/2017Donald would recommend this product to a friendOne less thing I have to deal with each day! My water level stays constant so salinity is constant as well. This is being monitored by my Apex using leak detection module.
I am very pleased with how well things are working.
Does not work consistently. By Zhong on 11/7/2017Zhong wouldn't recommend this product to a friendThe first one I bought 4 years ago is the only one that ever worked. I have bought 4 of these. I wonder if they changed manufacturers or quality of parts. The sensor will work for the first time the water level is low. Once it stops, the sensor will not pick up the low water level again until you unplug the system from the electric sort and plug it in again. The pump will constantly turn on and off even when it is not pumping.
Major issues By Morgan on 10/20/2017Morgan wouldn't recommend this product to a friendI currently have 2 of these. Only one is in working condition. One's on a biocube 29 and One's on a 30 standard. Both units have failed. I had a pump burn out on one unit. Bought a replacement pump. On the other unit the float sensor just wont work. I can hear the pump power up when i plug it in but it wont pump water. I have purchased 3 of the oz minis over 4 years. The last failure was the small circuit board where you plug in power got so hot it melted the plastic housing. You could smell electrical burn in the whole house. Of course it was in the 26th month of ownership. I will never buy another product by Tunze.
Good unit if you only need it for a year :) By KR on 10/6/2017KR wouldn't recommend this product to a friendI did not have the plug unplug issue but I do think the default fail safe it comes programmed with is pretty dang conservative so I'm not surprised people have that issue. I have had this unit for about 2 years and it worked great for a year and a half then the pump stopped working one day and that was that. I'm sure it's under warranty but their warranty process is a pain plus I should bite the bullet and upgrade to a better system.
What's the main differences between the nano and the 3155? Also, would be possible to upgrade in the future without having to buy the whole thing?
The nano osmolator is just a simple float switch and that is it. The 3155 has the dual level control with the optical eye for primary control and the float switch emergency backup. The 3155 offers superior redundancy.
It would not be possible to upgrade, they are entirely different units.
What if you dont have a sump, can you put the controllers directly in the aquarium?
Will this work on a 70 gallon setup!
While it may be sufficient for a tank of that size, depending on head height the pump has to push against, it does have more limited capacity and safeties set up for small tanks, so we don't generally recommend this one for tanks over 50 gallons.
Have a great day!
Can you increase/decrease the pump flow like the 3155?
Other than the reservoir, What else is needed for this kit? Also, what is the maximum head height of the pump? Thanks !
Other then the container the kit really comes with everything you need to get started. The pump has a max head height of about 7ft.
How much travel between on and off with this sensor? 1/3"/ 1/2" etc.?
The distance between the float being triggered and off is between 1/4" to 1/3" Feel free to let us know if you have any further questions!
I recently purchased one of these and think I will LOVE it but have a question. Each time I have gone to check on it, it seems the relay/sensor (whatever we call it) has shifted slightly so it is no longer sitting level. This is help on with the magnets, so am curious as to why this is happening or what I can do to stop it!
You can always try implementing a large magnet to ensure the hold is stronger. Other than that, there are some more permanent applications such as small amount of super glue. In any case your best bet will be to contact TUNZE and see if they have any tips or tricks.
Tunze – 512-833-7546 firstname.lastname@example.org
If this pump were to break could you use the Apex Neptune PMUP as a replacement for this system?
I'm going to be using the solenoid option with the 3155. Can i purchase it with out the pump it comes with? seam like a waste of money if I'm not going to be able to use it.
I was curious if this auto top off will work for my Innovative Marine NUVO 10. Would the water get too salty by the time the ATO kicks on?
That is a valid concern and if you are keeping SPS in the 10 gallon then we would suggest looking into the Osmolator 3155, however for most fish, and other corals like softies and LPS the Osmolator nano will work just fine. Since the return pump compartment is much smaller than larger tanks, when water evaporates it will move the water level pretty quickly and activate the float switch which is pretty sensitive.
Does this model have an optical sensor such as the one in the larger model?
Why can't this model be used on a larger system?
The unit is not suited to large aquariums because it has a timer based cut off so the pump will only run for a short period of time. Using it with a large tank can result in the the pump turning off before its finished replacing the evaporation.