- Osmolator Universal 3155 Auto Top Off - Tunze
Why does BRS recommend this?
Bulk Reef Supply tried many different water level switches and auto top off solutions before giving the Tunze 3155 Osmolater Universal Auto Top Off BRS Recommended status. Despite its higher price this is by far our favorite solution. Spending the extra money on a Tunze Osmolater will give you that extra peace of mind and insurance from having a disaster that ruins carpets or hard wood floors. For the value, and reliability it is hard to beat.
Max Head Height: 7.2 ft
The Tunze Osmolator 3155 is one of the safest ATO’s available. It utilizes an electronic eye sensor to monitor water levels and a backup float switch sensor with an optional audible alarm. The controller protects the quiet metering pump from running dry and reports an empty storage tank. Two magnetic holders for sensors and multiple mounting brackets included as well as a pump.
LED indicator lights the Osmolator will allow you to visually see if their are any issues with your top off system.
Two technologies of water level monitoring, and built in safety back-ups.
The optical eye sensor will keep the water level very steady to keep the salinity from fluctuating in your aquarium. The Osmolator does work well with kalkwasser.
Max Head Height: 7.2 ft
Note: With any pump, kalkwasser can cause premature wear. New pumps are available at a very reasonable price.
Time Saver By Mary on 9/13/2018Mary would recommend this product to a friendThe Osmolator ATO really save me a lot of time with my water top offs. I bought a 7gal rectangular plastic trash bin with lid and plumbed it to my sump and I'm loving it. Took a little finessing to get the sensors just right but once they're set it works great.
Failed By Greg on 8/13/2018Greg wouldn't recommend this product to a friendWorked for 8 months, got stuck in on position and emptied whole 5 gallon reservior into my aquarium causing it to overflow and flooded from 2nd fl to 1st floor. I am furious
Good product By AJ on 8/12/2018AJ would recommend this product to a friendWould recommend this product
Good ATO By Gary on 7/30/2018Gary would recommend this product to a friendVery good ATO. Had to replace my old one when lightning ran in on my house.
Overall as advertised and works great. By Saltwater King on 7/8/2018Saltwater King would recommend this product to a friendThe only thing is it did not come with the alternative bracket. You have to have room on outside of tank for magnetic to go up. In my case I have wood too so could not set with magnetic.
Don't even think about another type By The Reef Rocket on 6/29/2018The Reef Rocket would recommend this product to a friendWill never fail in on position.. float level backup,,, maintains perfect water levels.. I've been using it for years, never a problem
No perfect ATO's By Kurtis on 6/4/2018Kurtis would recommend this product to a friendIn 2 1/2 years I have owned 2 of these Tunze ATO's the first failed within a year. Like other reviews very difficult to get Tunze customer service to send out new parts for warranty. All I needed was a new electronic eye and it took a week of emails to get a replacement.
This is second one in two and half years, but I will mention that in that time frame have also purchased 3 ato's of another brand 1 of which was a replacement of warranty wont mention names. But they have GREAT customer service unlike Tunze, with that all being said in the 2 1/2 years I have owned 5 total ATO,s none of them including the Tunze ( most expensive model ) are reliable or have any longevity to them. As with anything you buy the test of time will be the judge, my bet is this Tunze will fail in less then a year.
Stop working By Randel on 5/26/2018Randel wouldn't recommend this product to a friendFor some strange reason stops working
Time-saving Technology By Richard on 5/21/2018Richard would recommend this product to a friendThis device is a real time-saver on my new reef system and was the first maintenance technology I purchased (after an RODI filter, of course). Next was an automatic feeder and the controller will follow, shortly. It made more sense to me to add this device before a controller because it's really the first serious step in providing stable water chemistry. I now view an ATO system to be as indispensable as an RODI filter. I lose about a gallon a day in evaporation on a 55 gallon tank w/20 gallon sump and I no longer need to top the tank off daily (or twice daily). Yay!!! I only need to fill the 5-gallon reservoir once every five days, which is much easier on me and likely much easier on the marine life since the adjustments are so frequent and small, 24/7. Now I'm ready to start using a calcium replacement method when the time comes. The sensor is surprisingly accurate/sensitive (removing merely a cup of water from this 75 gallon system will trigger it) and easy to install and the magnets keep it put. Every now and then it comes on while I'm viewing my 10 week old sparsely populated--but nevertheless fascinating--tank and it pleases me to no end. I have not been able to detect any fluctuation in salinity since installing the Tunze Osmolator and the stable water level in my sump keeps the glass cleaner. The intermittent water outlet also has the added benefit of mitigating surface film in the fuge. Now, I just need to figure out a 10-gallon reservoir so I can go over a week without water maintenance... It's kinda spendy for what it is but if it lasts me a few years, it's money well-spent. You know you want it so just buy it. I suspect you'll be as glad you did as I am.
Easy and low maintenance By GEORGE on 5/9/2018GEORGE would recommend this product to a friendWhile this is expensive, it's worth the process. It has multiple fail-overs, which really make me less concerned about over top off situations. It does exactly what it advertises. It was up and running in >15 minutes and it has an extremely small footprint in the sump, so I could squeeze it in the return chamber easily.
This is not a negative, but some things to consider. The alarm will go off if you are monkeying around in your tank. The high level alarm can be adjusted somewhat, but I have found that it is not enough to make a difference. Also, be careful where you put it in your sump as the high level float valve gets stuck rather easily if anything rest against it (pump cord against it, to close to the sump wall, rogue snail, etc.)
Trouble with warranty By Joshua on 4/16/2018Joshua wouldn't recommend this product to a friendHaving trouble getting anything with warranty because unit fails to power on, was like FBI interview. Did you plug it in? do you have electricity? Does it Beep. Spends more time worrying about a cheap black box controller than actually figuring out what makes the product defective. Like dude, if you dont want to honor the warranty , I'll just buy something else.
Works as advertised By Mike on 3/29/2018Mike would recommend this product to a friendGreat product, I just wish after it times out filling and the red light comes on that it might just try again, say every 6 hours or so. I like the fact that this is not part of the Neptune system that way if the salinity starts droping my Apex can just shut off power to the auto toper. But just for clarity I have had no issues with the Tunze
I have a litermeter 3 that has failed. It pushes water about 30 feet from the litermeter to a sump tank. Will this pump do the same?
The max head pressure on the included pump is about 7ft. It likely wouldn't be well suited to this application. That said though, you can get the additional switch socket adapter which would allow you to control any pump via the osmolator system. That way you can use a pump that can handle the head pressure.
If i have a wave maker and this ATO in the same tank (I don't have a sump), would the waves cause the pump to turn on and off constantly? Thanks
In theory it could present a problem but the circuitry in the Osmolator should help to prevent that. Every time the ATO is triggered it runs for a minimum of 15 seconds. It adds overfill to prevent short cycling. In most cases this should be sufficient unless the height of your waves is constantly changing.
How much head will the pump push
The pump on the osmolator has a max head height of 7ft.
Hi, by head pressure does this mean how many feet the pump will push the water? So if my pump is in my cabinet under my tank will it push the water to the top of my tank? Thank all over at brs..
Head pressure is the maximum height that the pump can push water vertically. If your tank is higher than the Head height listed this will not be able to work. Feel free to let us know if you have any further questions!
You say additional switch socket adapter to handle more head pressure. Where can i find this? I traveling about 15 feet 9 of that is up.
Will the sensor fit in the sump of an innovative marine 30L ?
This will work great in the back of a nuvo 30! Feel free to let us know if you have any further questions!
What is the measurement on the pump, as in the widest part? I need to know if it will fit in my container I plan to buy.
The diameter of the pump is just under 2" this is how wide the cap will need to be in order to allow the pump to pass through.
Is the retaining magnet waterproof?
What are the dimensions of the blue Tunze controller module/box. I am trying to determine if this will fit on an existing mounting board. Also, how does it mount? Adhesive or punchouts in the back plate. I don't see screw holes like the Apex modules have. Thank you.
This will be 4" long, 2.5" wide and 1" thick. it will require a Velcro pad to stick or to be used with double sided tape.
I have a 10 gallon tank and am concerned with salinity swings. I top off my tank every day but I'm afraid most of these ATO would not fill the evaporated water before my salinity starts to rise. What is distance vertically from the low to full position?
The optical eye sensor will usually sense and fill within the range of 1/4" Feel free to let us know if you have any further questions!
I have turned the control up to the max however it will not keep up with the evaporation? my tank is a 120 gal with 35 gal sump.
If you have calibrated the pump to maximum output and it is still unable to keep up you will want to ensure the pump is filling the proper amount. It may be that the head height (the vertical height the pump has to push the water) could be too high or other pump related problems. We have used the osmolator on larger systems with quite heavy evaporation with great luck. If the issues continue you will want to contact Tunze directly to see if the pump is working correctly! I have included their contact information below!
Tunze – 512-833-7546 email@example.com
Will this work with the Apex controller?
The Tunze Osmolator is an entirely self sufficient system. It is perfectly fine to connect the Osmolator to one of the Apex's power outlets incase you wanted to cut the power for some reason (like when you are doing a water change) though the Apex isn't capable of reading the Osmolator's sensors or anything of that sort.
Hello. I bought a used Tunze osmolator today. Do you sell replacement parts, such as the magnetic sensor holder. And, what is the best way to clean the sensors? Thank you. :)
Could you please post or email me, what differs from the 3152 and the 3155?
The 3155 will have 2 sensors the mechanical float and the optical eye. The 3152 will only come with the mechanical float switch. Feel free to let us know if you have any further questions!
Can you tell me the diameter of the wet side unit? I need to make sure it will fit inside the return pump side of my bio cube 14. I’m worried the sensor will not fit due to the narrow area I have to work with.
I have the -osmolator nano 3152 ATO and I was wondering the water level controller can be adapted to it
Would you happen to know the max head pressure of the Tunze Osmolator's pump?
The max head pressure on the osmolator pump is 7ft.
I purchased the osmolator from your site and was under the impression it had an alarm that went off if the ATO container was empty to prevent the pump from burning up. I've tested this, but my pump just keeps running and there is no alarm?
This osmolator will run for typically 10-15 minutes in a dry container. eventually the controller will sense that it has not filled in a timely manner and should turn the system off. if this continues to not be filled there may be red flashing on the controller. For direct assistance you will want to contact Tunze directly!
What is the power consumption of this unit?
The power supply has 12V, 1600mA maximum output, connected to a watt meter with the pump running, the draw at the outlet is generally around 8W at 115V with the pump running. The entire system uses 1-1.5A at 12V depending on pump speed setting and head pressure.
What pump do you suggest to go with the3155 osmolator?
The Osmolator actually comes with the pump right in the package so you don't need to buy one!
Can i purchase this item with a australia (SAA3) wall pug not a north america one thats shown in the photo?
We appreciate your interest, but I'm afraid our distribution area is limited to North America and all of our equipment is wired for standard US 110v electrical.
Have a great day!
Just wondering if I need 2 ATO. I know you can place it either in the sump or in the tank, but my question is if I place it in the sump will it also refill my tank in that process. I don't see that happening but if it does please let me know.
If you have a sump, it MUST go in the sump, in the chamber where your return pump is. This is the only area of your tank that will have a changing water level depending on evaporation (unless its far too late!). Only one ATO would be necessary but it must go in that location if you have a sump.
My Tunze Osmolator ATO keeps getting stuck in the ON position. I soaked the electronic eye in vinegar and it was fine for a week, but then it stuck on again. Do these electronic eyes fail after many years of use? I've been using it for about 4 years. Is there any way to replace the eye without having to buy a whole new system?
We run into very few issues with these but after that length of time I would imagine its possible for any component to fail. We don't have individual parts like the optical eye, but if you give Roger and company a shout over at Tunze USA, he might. At the very least he could likely help you narrow down exactly what it is. The number I have for them is 512-833-7546 firstname.lastname@example.org
Does the pump get placed directly in the top off water reservoir? If so what are the dimensions of that pump? I am trying to decide what kind of reservoir I can use before purchasing a ATO.
That is correct. Its a submersible pump that gets stuck right into the top off water. If your interested in this ATO system you should give this blog article a quick read. It goes into a lot more detail on the system (which is one of my favorites).