- Neo-Therm Submersible Heater - Cobalt Aquatics
Cobalt Neo-Therm heaters are very unique. They have a super thin profile that allows them to fit into tight spaces like on AIO compartments, or sump baffles. With its easy to set and easy to read control system, setting a heater has never been this easy.
- Easy to set "One Touch" control
- Advanced electronic thermostat - Accurate to ±0.5ºF
- LED Display - shows the Set Temp and Tank Temp simultaneously
- Set temperature range from 66ºF up to 96ºF
- Safety features
Safety Features - integrated thermal protection circuitry shuts the heater down before it can overheat. The outer casing is shatterproof making the NEO-therms virtually indestructible. Use for freshwater and saltwater aquariums and terrariums.
Correct heater position- Vertical with heating element down, bezel, cord, and button up.
- Minimum water level - Top of the bezel.
- For 25, 50, 75 Watt - 5.5" from bottom of the heater
- For 100 Watt - 8.75" from bottom of the heater
- Maximum depth of 31.5" deep at the bezel
Quick Compare - Cobalt Neo-Therm Submersible Aquarium Heaters
|Model No.||Maximum Aquarium Size||Dimensions|
|25W||6 Gallons||6 1/2" L x 2 1/8" W x 4/5" Thick at Bezel|
|50W||12 Gallons||6 1/2" L x 2 1/8" W x 4/5" Thick at Bezel|
|75W||20 Gallons||6 1/2" L x 2 1/8" W x 4/5" Thick at Bezel|
|100W||29 Gallons||9 3/4" x 2 1/8" x 4/5" Thick at Bezel|
|150W||40 Gallons||10 7/8" x 2 1/8" x 4/5" Thick at Bezel|
|300W||75 Gallons||10 7/8" x 2 1/8" x 4/5" Thick at Bezel|
Note: 300W model consists of two connected heating elements that measure 10 7/8" x 2 1/8" x 4/5" each.
Disasterous Failure By SubourbonKentuckian on 1/24/2020SubourbonKentuckian wouldn't recommend this product to a friendI bought this 300w Cobalt Neo-Therm new in August. I installed it in my 30G sump late September. It has been submerged it's entire short-lived life: a total of 3.5 months. Today it failed disastrously while I was at work. It filled an entire level of the house with a rancid smoke and a smell that's still here 10 hours later. The tank water smells like burnt rubber. Who knows what nasty chemicals it belched through the water column into the house?
I've been doing emergency triage all day: 1.Added activated carbon and new filter socks to the system until I can do a massive waterchange.
2.Have my BulkReefSupply RODI unit producing at least 55G to mix and use --not as quickly as I want though-- I should have had that already mixed and ready on standby. My failure.
3. Installed my mixing tank heater into sump and ran to the LFS an hour away to get a replacement.
4. All fish accounted for and eating.
5. Softie corals are not happy.
6. Elegance coral has already died.
7. Fingers crossed
Great little heater By Steve on 1/19/2020Steve would recommend this product to a friendI purchased a 75W Neo-Therm Submersible Heater for my quarantine tank (Nuvo 20) because of the small size and reviews. I love the heater so far. Works as advertised and is the perfect size for the AIO sump.
Decent but not achieving the results of the BRS video By Tony G on 12/23/2019Tony G wouldn't recommend this product to a friendSHORT VERSION:
Do: Make sure you have the room to install the heater vertically, making sure it is submerged all the way.
Do: Make sure you have enough water depth where you plant to install it.
Do: Make sure it will never be uncovered at all when your pumps turn off or your return pump runs dry.
Do: Plug this into your Apex outlets 4 or 8, or to a non-switched outlet (e.g, not on an Apex).
Do: Have reasonable expectations that you will see a variation in the tank temperature during the day, as well as day to day.
Don't: Install the heater on an angle.
Don't: Plug this into Apex outlets 1 to 3, or 5 to 7.
Don't: Expect to see the same results from the BRS video where the Apex couldn't detect a temperature change at all.
I bought the Neotherm 300W based on the BRS video showing that the temperature was so constant that the Apex couldn't read any variation in the temperature at all. My experience has been far from that goal.
I bought this when I was setting up my reef tank in May of 2019. The first few days of having this installed I was checking the temp daily and it was at exactly 78.0 degrees and I was very impressed and happy. However, starting on day 4 the temperature steadily increased by .1 to .3 per day for the next 10 days or so. Eventually it reached 80.2 degrees and leveled off there. This was all while I was cycling my rock in a brute trash can and the temperature rise may have been caused by the heater falling off the side of the brute and no longer being vertical. This occurred before I knew that was a requirement.
After my display tank arrived, I installed the heater in my sump on a 100 gallon display tank. The heater was installed on an angle and was consistently around 79.8 degrees, rather than my set point of 78.0. Daily variation was generally pretty good, just around a higher temp than I wanted. The heater was actively kicking on to keep the temperature around 79.8 degrees.
I contacted Cobalt and they wanted pictures of how it was installed in my tank. They want it positioned vertically otherwise they won't support a warranty claim. They also want it installed on one of the relay outlets on your Apex and mine was on one of the other types.
I reconfigured my sump to run deeper (this can be a pain so be aware!) and now have mine positioned vertically. Setting it vertically fixed it so that now I run around 78.2 to 78.4 rather than 79.8.
I experimented with plugging this into a relay outlet on the Apex, as well as into a power strip that wasn't on the Apex, as well as one of the non-relay outlets on the Apex. All three cause the heater to behave differently which seems very strange to me. My personal best results have been on the Apex non-relay outlets (1 to 3 or 5 to 7).
Some days are good with just .2 to .5 between the high and low. Others can be between .5 and 1.2. I have had my temp randomly drop down and hover at 77.0 degrees. The heater is kicking on and off keeping it at 77.0 degrees for no apparent reason. Power cycling it didn't help so I tapped it a bit and bumped it a bit and then it went back up to around 78.2. Weird.
Anyway, my general opinion is that it isn't worth the extra money I spent on it because I am not seeing the results that were achieved in the BRS video. I don't have experience with other heaters so maybe I would find them so unreliable that the Cobalt would shine by comparison, but for now I consider the hefty additional price tag to be a waste.
When it comes down to it, I will probably end up having my Apex control the Neotherm. It would be way cheaper to have a $32 Jager TruTemp 300W controlled by my Apex, rather than a $140 Neotherm 300W. The additional $108 is wasted money.
I hope this helps you make an informed decision.
Do Not Buy! By Brian on 11/19/2019Brian wouldn't recommend this product to a friendHeater just exploded after being used for only 6 months, smells horrible. Luckily I was standing next to my tank! Do not use this heater!
Leaks electrical current By Paul on 8/31/2019Paul wouldn't recommend this product to a friendThese heaters have a major issue with leaking stray voltage into the tank. I have gone through 4 of these heaters in less than six months, 2 100W and 2 150W, all of which put off a noticeable electrical current after several weeks of use. My local LFS recently stopped carrying Neotherm heaters due to thermostat and electrical leaks as well. Based on the other reviews, electrical current leaks seem to be an on going issue with theses heaters. I wouldn't trust these heaters at all, and encourage fellow reefers to pass on them.
heater split open By andy on 8/30/2019andy wouldn't recommend this product to a friendUsed in ro/di tank. Heater only used when making water. Like others said, makes a burnt / chemical smell and noticed the heater split open. Its plastic covered over metal parts. I wouldn't recommend using this, and your just gambling if you use this. Too many other reviews with the same results.
Failed after a year and killed all my coral By David on 7/11/2019David wouldn't recommend this product to a friendAfter a year I noticed my tank was cloudy one morning. The heater has started to split and was still heating even though the tank was 95 degrees. Killed half my fish and all my coral. S
STAY AWAY! Cobalt sis not stand by their product and told me I should have had a temperature controller as a backup.
BEST HEATER EVER By justin on 4/28/2019justin would recommend this product to a friendI HAVE TWO OF THESE HEATERS IN MY TANKS SUMP. THEY HAVE BEEN WORKING NONE STOP FOR 7 YEARS AND I HAVE NEVER HAD AN ISSUE. I HIGHLY RECOMMEND THIS PRODUCT.
Accurate but use caution By James on 4/26/2019James would recommend this product to a friendI have the 300, 200, 150, and 75 watt heaters. They're all very accurate and maintain tight tolerances. The form factor is great for flexible placement. All heaters should be replaced periodically because they all fail eventually. However, in the past month I've had the 300w and 200w start leaking voltage into the water without any warning except for the shock I received. In this same time period I had the 150 die but fortunately it was in the off state and my Apex warned me that the tank temp was dropping. I'm switching to the Finnex heaters for a while to see how they do as I've had a cheap 50w Finnex for longer than all of these Neotherms and it's never failed me. But while they ran (more than 3 years but less than 5) they were phenomenal.
Biocube 29 1st chamber By Brettward on 3/20/2019Brettward would recommend this product to a friendI use this slim profile heater in the first chamber of my biocube 29 in conjunction with the external probe of my APEX head unit. Together, they exist without anyone seeing them and keep my tank within 0.2 degrees variance. I've been recommended by external sources to replace the heater once a year, but I've not experienced any type of failure from the unit so I'm uncertain of that suggestion.
failed after less then 1 month!!! By JamesJ on 2/27/2019JamesJ wouldn't recommend this product to a friendReplaced my two 150 Eheim heaters with two of these. One failed in less then a month! was not coming on constantly and sometimes only drawing 50 watts instead of 150 so temp was dropping in the tank. Going back to Eheim for sure. thanks to using two and apex caught before it was a big issue.
Had three - all in various service still after 4 years By Ramfublio on 2/18/2019Ramfublio would recommend this product to a friendJust to balance the reviews. Have three. Used two in display tanks, a 100w in a 20g and a 150w in a 30g. And a 150 for mixing salt. All still work and are accurate. No smoke, no explosions. About to retire them just for safety. Will have them in my backup kit for that sad day of something going wrong.
I have a 2 1/2 gallon tank for my betta.
Is the 25Watt Neo-Therm ok for me to use in my tank?
I would like to set it about 78 and hold it there.
My last heater rose the water to almost 88. Not good.
Typically 2.5-5 watts per gallon are recommended. While the 25 watt could work if left on the lowest setting and certainly can work well with safety built in it has the potential to over heat if left on too warm of a setting.
I have a 94 gallons tank.
What kind of cobalt heater do I need, how many watts
You will want 2 of the 200 watt heaters for good coverage of your tank! Feel free to let us know if you have any further questions!
I have a 46 gallon bowfront with a 20 gallon sump, given water displacement from live rock and filter media such as protein skimmer and reactors and live sand, would a 150watt be sufficient enough to heat the tank?
Have a great day!
How many amps does the 200 watt heater pull?
We expect around 1.6 amps. Feel free to let us know if you have any further questions!
Can these be mounted horizontally? The manual from cobalt has a big X in a photo over them being sideways, and only shows them OK upright. Your overview here says they can be submerged at any angle though... don't know how anyone would fit anything 100w and up completely underwater in a sump straight up and down.
Regrettably, the quick overview is incorrect. This heater should not be mounted in any position other than vertically, with the cord and buttons at the top. We will get that updated ASAP. Have a great day.
Just bought a Nuvo 20 from you guys. The chart says 75W for 20 gallons, so should I just follow that or would 100W be more reliable?
Heaters are one item that I would not recommend going higher than what you need. If the thermostat were to fail in the on state and you had a larger one in the tank it would cause problems faster. I would stick with the 75 watt recommendation.
If you have any other questions please let us know!
Will this heater shut off if it is not all of the way in the water? When doing water changes on my solana, the area that the heater will go in will be out of the water for a few minuets
It won't shut itself off (I don't know of any heater that would). You will want to unplug it before its removed from water (or if you have an aquarium controller you setup something like a feed mode to shut down your pumps, heaters, etc at the press of a button for when you do a water change).
Is there a calculator that helps you determine what sized heater I need for each of my tanks?
There isn't a calculator as each heater is a bit different, but all of the manufacturers do have recomended size aquariums for their heaters. If you look at the full details of this page there is a quick comparison chart to help you match the heater size to how big your aquarium is.
I have a 10 gallon tank right now. I also have plans in the future to expand my tank size to around 20-30 gallons in the future. If I buy the 100 watt heater now and put it in my ten gallon tank with the idea of using this same heater in the future would it be complete overkill? Would putting in this high watt output heater be detrimental on the 10 gallon tank?
Thats not a problem at all. If the heater is larger it just won't run for as long, nothing to worry about!
I am in the process of setting up a 40 gallon hex reef tank, and would like to get a recommendation for a heater. I am not wanting to get the latest and greatest model. Just something reliable and not glass.
Most of us around here use the Neo-therm but the second most popular has to be the finnex HMO series heaters. Assuming you don't have an aquarium controller yet I would get something that has a digital thermostat as they are a lot less likely to fail (in particular in the ON position).
I'm just waiting on the Apex gold to come out. I want to put an 85 gal coral frag/semi show tank together. With the Apex , can I run two cobalts in tandem or do i need a bigger heater than the biggest Cobalt Neo therm? I think its only good to 55 gallons . Plus I have the sump volume aswell do factor in.
I think they should be here this week :-) The different outlets have different amperage allotments but in general unless you are using two very large heaters your not going to run into any issues :-) Just for example, the 8amp outlet would be able to power about a total of 950watts. Should be way more then plenty for a 55g tank!
Once the temperature is set, if my Apex unit cuts power to the outlet (temp gets out of range) does the heater remember the last set temp or does it reset to a default? If it is a default, what is it?
The heater should remember the tem, but that said with a setup like this what you would want to do is set your heater for your desired temp (say 78 degrees) and then set your Apex as an emergency cutoff to cut the power if the temp gets too hot and it appears the heater has failed (say 79.5 degrees). That way the heater is in primary control and you will avoid constantly cutting power to and from it (which may be hard on the heater).