Hydor Submersible Aquarium Heater Aquarium Heaters at Linens 'n Things

On April 27, 2013:
As the title says, it's my third one! I'm so in love with these heaters... The first one, I have now had for about two years! It is the smaller 25w one, but the fact that it has lasted this long (and will probably keep lasting me for a good while) says a LOT! Most smaller heaters are poor quality, defective, and while cheap they only last a few months... and as a fellow betta keeper, I have come across MANY other betta owners that have bought cheap heaters for the convenience of price and it didn't last them even three months. The second heater, I actually bought for a friend of mine who also has a betta- poor thing never had a heater until I got one for it and that betta enjoyed the warm tropical temperature as much as mine does. I'm only buying my third heater because I recently got another fish tank for a new betta... and I know the hydor theo is too reliable and too great of a bargain to pass it up. Heating aside, it also feels durable. I was originally worried I might break it because it's made out of glass or something that feels a lot like it... but once you get past that feeling, you find that it is indeed a durable little thing. I've accidentally banged it here and there and it still works like a charm. The light is very convenient to know the heater is still working. It's very easy to clean if debree like bits of algae or dirt from your substrate gets onto it, and the fact that it's submersible and has FANTASTIC suction cups means it's very easy to move around and position in your tank. As I said, it's been about 2 years and the suction cups are still working great (and that's saying something for suction cups!) All and all I can't help but recommend this to anybody looking into a heater... I know there are some people that have experienced defective heaters, but I'd honestly have to say it's the luck of the draw from the manufacturer. Definitely dig into reviews and see how many actually deal with defectiveness involving a great quality heater such as this.

On December 31, 2012:
I have had this in a Aqueon 2.5g Mini Bowfront for almost a year now and it works great. I have to set the temp lower than what it states on the dial, but that is to be expected due to the small size of the tank. Once I fiddled with the temp setting a bit it holds my Betta tank at a steady 78 deg, which is perfect. I would totally recommend it to anyone with less than a 5 gal tank as long as they knew to work with it a bit to get the temp correct before they state that it is to hot.

On November 11, 2012:
Put this 400 watt heater in service last night. Although turned all the way up; the heater will only stay on for 15 seconds. Temp. had dropped 10 degrees so had to switch for another heater. Since I bought it back in july;it's not returnable. JUNK!

On March 11, 2012:
Ordered two heaters. One of them works great. The other malfunctioned. Indicator light stays on but does not heat...

On May 27, 2011:
Compact enough to fit in corner of my 10g tank to not look cluttered. Nice glassy look and easy to adjust temperature dial. Works great, looks clean, easy to set-up and it generously comes with two suction cups.

On April 24, 2011:
The heater works real well and adjusts good. Submersible feature is very useful since our tank has a cover.

On April 9, 2011:
I purchased the 300 Watt one for my 55g tank - nice looking heater, stays very neat with the suction cup attachment, easy to adjust temperature, sturdy enough to withstand curious bumps and mouthing from my active large goldfish, and best of all, IT WORKS! Keeps the water nice and warm and my fish happy even though the tank is in the coldest room of my house!

On March 12, 2011:
Aquarium heater and thermometer with alert were better than expected and will use Pet mountain again.

On December 14, 2010:
We purchased this heater for a 12 gallon aquarium and so far it seems to be working. The orange light comes on when the heater is on. I don't have a separate thermometer to test the actual temperature, but I have confidence that it's working. The heater was easy to install and it's easy to see the different temperature settings.

On November 30, 2010:
I'd been having problems maintaining an even temp in my fish tank and tried this heater. It does a fine job - stays within 1 degree +/- without fail. I'm very happy with it.

On September 7, 2010:
My wife got the 200 watt hydro theo from a friend. Is still very accurate being used for months. would definitely recommend.

On July 16, 2010:
I bought the 150watt Hydor for a 29 Gal but have always had an issue with it. I set it at it's coolest and it will keep the tank above 84 degrees. It will cycle on and off, seems like the calibration of temperature is off. Judging from other review it's possible this is a rare occurrence. I wish I had paid closer attention when I first got it, so I could have returned it to seller.

On June 27, 2010:
No problems.

On June 9, 2010:
I have only had this heater a few weeks so far, but it seems to be working quite well! It has kept the temperature regulated since I put it in, and does not feel too hot to the touch, which I like because my turtles like to touch it! It also seems to stay in place well. Overall, I like it so far!

On February 19, 2010:
I bought this heater for my 10 gallon approximately four and a half years ago. To this day, the temperature only fluctuates by 1 degree, which seems fairly small and it only fluctuates when I turn the light on and off. Great product. Looking to buy one for a 5 gallon tank for my dwarf puffer.

On November 6, 2009:
This 400 watt heater worked 30 days and then would not shut off.

On February 21, 2008:
I boght this head for my tank 75G, it keeps exactly the temp as I swith to. I recommend this heater for big tank

On November 3, 2007:
Great heater and VERY precise! Can't beat these prices here =)

On June 30, 2007:
I am able to use this heater with my seahorses and not worry about them getting burnt. I would definitely recommend this product to anyone with curious fish!

On November 14, 2006:
It is better than expected for a very decent price. Also, works like a charm!