Amazing for nano tank By Mike on 3/29/2015
Mike would recommend this product to a friend
I have this on my bio cube and it fits perfectly in the back chamber the low-profile give me great room for filter media. I've had it running continuously for around eight months now with zero issues been able to keep constant temperature of 78 which I've checked with secondary thermometers on my apex unit
Malfunctioned after a month....May have had a lemon. By Chris on 3/27/2015
Chris wouldn't recommend this product to a friend
I had the 75w for a 20 gal frag tank. Kept it set at 80 deg which kept the tank around 78.5 deg for about a month. Came home one night to find my acros in serious distress. Tank temp was 70 deg. There had not been a power outage. Heater was still set at 80 deg. Put the acros in my DT. Unplugged and plugged the heater in and reset it to 80 deg. Water came up to about 79 degrees that night. Came home the next night and the tank temp was 72 deg. I won't use this heater any more.
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.