- 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.
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.
Very Happy Until Now By Michael on 2/7/2019Michael wouldn't recommend this product to a friendI purchased the 75w for my IM Nuvo 20g in Nov of 2016. I couldn’t have been happier with it until recently. I have it hooked up to an Apex jr. It has kept the tank consistently at a temp 76-78. Variations are typically caused by a very specific thing when they occur. But recently I have been getting low temp alarms. When I investigate the setting on the therm is at 70. I reset it back up and all is good. This morning the same thing happened again. This time I can’t adjust the temp, the button isn’t doing anything. This heater should last longer than 2yrs 2mnths.
200 Watt model split open By DBD CA on 12/24/2018DBD CA wouldn't recommend this product to a friendBought two of the 200 Watt models with 8/2017 manufacturing date. One is new in the box to serve as a backup. AThe other one has been used to mix ro/di water and salt mix about once a week for a few hours each time. About a week ago I noticed a chemical smell in my garage when preparing saltwater. I discovered about a 6” split on the face of the heater. I’m certain if this heater failed in my display tank all would have been lost. It’s unfortunate I can’t post the photos of this heater.
Electrical current By joshua on 12/18/2018joshua wouldn't recommend this product to a friendAfter only 3 months I felt a STRONG electrical current in my tank. I sources it to my 3 month old Cobalt heater! These things are junk. Just get a titanium heater and save yourself the trouble. What a let down....
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).