Avoid By Paul on 3/23/2015
Paul wouldn't recommend this product to a friend
Nothing here warrants the price of these heaters. The shape is convenient for a sump. They are reasonably accurate. I have owner three and none have lasted more than 24 months. Each has gone with an audible pop and the acrid smell of burning insulation. One of the three tripped the GFCI. None were kept full submersed.
Good but expensive and weak By Patrick of Bay Area Coral on 3/16/2015
Patrick of Bay Area Coral would recommend this product to a friend
I purchased the 150W on NOVEMBER 22, 2014 and have been using it since. I sleek design and digital temperature sensor is great, but it was not enough to keep my 50 gallon aquarium warm during winter. I had to supplement with another 150w heater. I am looking forward to the new line of 300w+ dual heaters!
Fried my corals By Chris on 2/9/2015
Chris wouldn't recommend this product to a friend
This heater worked great for the first six months or so but then I came downstairs one morning to find my anemones, corals, and clam in obvious distress. Put my hand in the water and got a serious shock. The bottom seam of this heater had split and was electrifying my livestock. Managed to save about half of them, but will stay far away from these in the future.
Blew up! By Flannigan on 2/8/2015
Flannigan wouldn't recommend this product to a friend
I had the 200 watt heater and thought it was great for the first six months of use, until it blew up in my sump. Five minutes after I got home from work, I heard a loud band, like a firecracker. I wasn't sure what it was until I noticed my dogs smelling the fish tank stand. I walked over to the tank and started smelling a very bad burning plastic/electrical smell. By the time I got to the tank, so much smoke was around it. I opened up the cabinet to see the the heater had blown up and was bubbling smoke into the water. I quickly unplugged the heater and opened all my windows and doors. There was so much smoke, I could barely see anything in the cabinet. On top of that, the heater released a gooey black tar like substance into the tank that was next to impossible to clean up. If i wasn't home, my whole house would have filled up with toxic smoke and possibly made my dogs sick or something. This was my experience and have noticed from internet searches that I'm not alone. Think twice before getting one of these.
works great so far By Nate on 1/31/2015
Nate would recommend this product to a friend
Have had it about a month and it's keeping a constant temp. I'll repost if anything changes.
Nice Heater By RNMIke on 1/21/2015
RNMIke would recommend this product to a friend
So far, I really like this heater. It works well, and I'm happy I'm not adding a glass tube to my tank. It seems nearly impossible to break this thing. I gave 4 stars because the temp numbers are a bit off on the thermometer dial. I have the dial set to 76 degrees, and the tank is staying at a rock solid 77.6.
works great By walter on 1/2/2015
walter would recommend this product to a friend
A slim design and it fits nicely in the back of the tank. Keeps the temp steady, no complaints other than price
Good heater, if you don't mind the price or lack of fine tuning By Bruce on 12/14/2014
Bruce would recommend this product to a friend
Got a little 50w that I used in a 10g for baby Banggai and have also used it in 5g buckets for rotifers. Easy to use and holds temp well. Have used other brands that forget the setting if power blinks, these remember.
What I don't like is that it is only adjustable in 2 degree increments and it is a little pricey compared to some similar functioning and equal quality units.
4 stars for quality and performance, lost one for adjustability and price.
Heater blew up in sump and filled house with smoke, nuked tank By Exxon Valdez on 12/3/2014
Exxon Valdez wouldn't recommend this product to a friend
This heater exploded in my sump and filled my house with smoke that smelled like an electrical fire. A black, sticky, tar like substance was floating on the surface of the water that smelled like road tar mixed with gasoline or paint thinner. I lost half my fish and corals and had to use a degreaser on the sump and all equipment to get the foul smelling tar out. I thought I was getting the best heater on the market. I have contacted the company, but I am not happy with their response. The guys who own Cobalt Aquatics were associated with the stealth heater explosions and recall. You'd think they would have learned. Do not buy these heaters.
Great design By CTReefer on 9/15/2014
CTReefer would recommend this product to a friend
Have this for my Nuvo16, fits great in the rear chamber. No issues with keeping my tank at 78degrees.
Blew up in my tank after 3 months By Daniel on 9/1/2014
Daniel wouldn't recommend this product to a friend
I bought a 200W heater for my 40G tank because it was supposed to be one of the best on the market after 3 months it could no longer regulate the temperature, than after about a week i woke up to a burning smell and it had cracked the casing and was burning up inside my sump, i don't know if anything has died yet but if they do i will make another post, i emailed their customer service waiting on a response.
just put in tank 4 days ago.... By Timothy on 8/28/2014
Timothy would recommend this product to a friend
bam! just plugged in after letting sit in cold tank for 15-20 min, per instructed, and checked back on it later in the day and has sat at 78 degrees on the dot every since plugging in. i used 2 on my tank for a back up and to help share the work load so i can increase longevity of heater. pick a few up. look modern, sleek, sexy, and feels like nice balance/weight = quality. enjoy
Nope By Everett on 8/17/2014
Everett wouldn't recommend this product to a friend
I would not buy one of these again. As mentioned in other reviews this heater stops working and takes out anything else its plugged into. For me it was my heater controller. it also leaked voltage into the tank.
4 heaters. product FAIL. By Subodh on 8/6/2014
Subodh wouldn't recommend this product to a friend
An otherwise neat looking product; This **was** what I once thought the best heater in the market. On my 200 Gallon with a 50 Gallon sump, I've tried almost every other brand and they all eventually fail within 6 months. This one lasted a bit longer than that (about a year). Average life of the heater seems to be around 6-8 months. I've had 4 of these (200 W) explode in my sump and trip the GFCI.
Yes, I understand salt+electricity is a bad combo to begin with itself but I hate the smell/stink when these blow. They aren't cheap by any means so I might as well switch back to the glass heaters. At least they visibly get dirty and don't explode like these.
For those who're interested, these heaters all fail at the bottom plastic edge with a big crack (weird considering the top is what most people would assume to fail first) and if you're not running a GFCI + probe on your aquarium, these heaters (and most likely most all other brands) can leak serious voltage.
So Let Down By Aaron on 7/8/2014
Aaron wouldn't recommend this product to a friend
The heater exploded in my sump. All the fish are dead. All the shrimp are dead. The coral looks very bad.
I have never felt so let down my a product.
like the flat design (150) By shawn on 7/2/2014
shawn would recommend this product to a friend
Keeps temp in my Nuvo 38 gal within 1degree of setting. Nice flat design with snap in suction mount. Working well and would recomend.
Love this heater By Lionel on 4/10/2014
Lionel would recommend this product to a friend
Although the cost is slightly higher than other models, after having 4 glass heaters fail on me within the first 6 months, there is good value with a 3 year warranty.
Also nice to have a heater that has the indicator and sleek design
So far works great By Ryan on 4/7/2014
Ryan would recommend this product to a friend
Have only been using it for 1 week but the product has been working as advertised. Currently using the heater to heat a tub to cook rock in m,y garage and the temp has bee really steady even in the morning when it's pretty cold.
Busted within 2 months of purchase By Kailua-Kona on 3/24/2014
Kailua-Kona wouldn't recommend this product to a friend
The 200W Neo-Therm is a great product when it's working. The plastic shell busted within 2 months of service and now the heating element is dead.
I have tried to contact Cobalt customer service, but I am still waiting for a reply.
These are very solid units!! By Sean on 3/20/2014
Sean would recommend this product to a friend
Cobalt has done a fantastic job with these heaters. I got two 200W units and am very impressed with how solid they are built. The only thing I could ask for would be better suction cups that hold them to the inside of your sump or tank.
Great product! By Luis on 2/24/2014
Luis would recommend this product to a friend
Great product! My temperature used to swing +-1 degree with my old heater. Ever since I put my new neo therm heater in my swings dropped to +-0.2 degree. Very accurate, indestructible, small footprint and easy to read thermometer.
Leaks Voltage By Worm5406 on 1/21/2014
Worm5406 wouldn't recommend this product to a friend
I bought 4x 200 watt versions of these. I have now had 2 of them die and leak voltage into the tank. They not only leak voltage they both would not light their own lights and even show they were on. I took a voltage meter and tested it numerous times, and replaced it and the 90VAC in the tank disappeared. I would understand one... but two within a week time span in unacceptable.
I have had one get a thermal barrier around it in bubbles and stop heating.
I do NOT think these are what they are cracked up to be. I had high hopes for them but with 50% failure, I am sure I will be sending them all back and switching to the old standby, glass... Even though I do not wan to, I can not stand being shocked.
After I left the two bad ones outside the tank they turned back on and stop leaking voltage.
Great product By jarodw45 on 1/13/2014
jarodw45 would recommend this product to a friend
100 watt heater works quickly and keeps water temp perfectly Set at your desired set temp.
Very happy! By Leslie on 12/20/2013
Leslie would recommend this product to a friend
I am very happy with this heater! Easy to set up and I like that it shows if the temp of the tank is above/below the desired set temp. As always,great service from bulkreef!
Worth the cost over other heaters By Chris on 12/9/2013
Chris would recommend this product to a friend
Love the Cobalt heater- although it's rather expensive in comparison to other heaters like it, the quality is 10x better and it's a small investment for keeping your animals healthy. It's also the first (and only) heater that I wouldn't mind seeing in the DT, it's super sleek!
This thing is great! By James on 11/26/2013
James would recommend this product to a friend
This is hands down the best heater ever. Compact, accurate and so easy to use. The display is clear, the slim design fits in tight spots, and it seems to be indestructible. It is not a fragile heater!
Great little heater! By Chad on 11/9/2013
Chad would recommend this product to a friend
I bought this heater because of its dimensions. But it turned out to be one of the best heaters I've owned. This fits perfectly in the inTank Aquaclear 70 media basket. It holds the best steady temp of any heater I've owned. It's also built to last!
Super Tight Range By dac on 6/15/2013
dac would recommend this product to a friend
Use a 50w for a 6gallon pico. I picked it up because I was in a pinch when I thought my Aqueon heater broke, and wanted a stronger product. I did not want to pay $55 but it was what it was. I can definitely say it's worth the price. The temperature swings are so stable and tight compared to the Aqueon, which swung around over 1.2 degrees/day. The cobalt is more like 0.1 degrees. And it's nice to have a built in thermometer right on the heater. I use that side by side with a digital, and the redundancy is comforting. It's also basically indestructible, so you dont have to worry about a rock falling and breaking it like with other heaters. I will certainly pay up and stick with this heater series when I upgrade to my 57 rimless.