Comments: This heater is the best on the market. I was using another brand but always "felt" that it was giving false readings. Set this one up and I was right. It was running my tank 2 degrees warmer than I had it set for. This heater immediately corrected the issue and has been working flawlessly. I also invested in back up temp monitoring and it confirmed that this Fluval heater is the exact temp its set for. Awesome product, only wish I have is it didn't use suction cups. Would have been better off with some sort of magnets to hold it in place. Still it's a perfect heater and would recommend it!

Comments: I have four of these 2 X 50W, 200W and 300W and they're all doing great especially at night time. Easy to read the temperature and very accurate readings. ( I still have the original basic thermometers also installed and compare them just to make sure readings are correct.

Comments: This is an excellent heater. The integrated LCD is great and the color coding lets you know at a glance if the temp is correct. Love that the glass in covered and that it is easily disassembled for cleaning. I have the heater horizontal near the substrate and it keeps the temp to within a half degree. Use the wattage rating only as a guide, ALL aquarium heaters can only raise the temperature of the tank a certain degrees above room temp, so instead of relying on the number printed on the box do a bit of math before you purchase. I needed the 100 watt to heat a 9 gallon tank (actually 7.5 gallons when you calculate the thickness of the glass and the fact that you don't fill it to the top)

Comments: I love this heater and actually had it for a year and baught another for a frined, I like having the temperature displayed with the LED and the fact that it changes color when the temerature is too high, too low or jsut right.

Comments: Extermely weak heater..Will not heat 4 gal of water...

Comments: I had been eying these heaters for some time and finally decided to purchase three; a 50 W, 100 W, and 200 W for a 6 gal, 29 gal, and 37 gallon aquariums respectfully. They were to become my primary heaters thus relegating my current ones to backup. I liked the fact that the plastic housing would protect my invertebrates from being fried and the color-changing, lit-up, digital thermometer would be highly visible for instant feedback. The 50W and the 100W were the first to arrive so I put the 50W into a 4-gallon bucket destined for a water change. The heater was not able to get the water up to 79 or 80 degrees. It could only maintain the 4 gallon bucket at 77 degrees. I thought that if I added a Coralia Nano to the bucket, the added water movement would help, but it didn't. The 100-watt heater went into my 29 gal aquarium to replace the $17 standard variety heater that everyone is familiar with (It is made by Penn-Plax and called Cascade Heat...it has a lifetime warranty by the way). I was extremely disappointed to see that the temperature began to drop when I unplugged the standard heater. The Fluval E 100-Watt couldn't maintain the 79-80 degrees that my old 75-watt had no problem handling with ease.With the definition of insanity being trying the same thing over and over again and expecting a different result, I decided to stop the insanity when I received the back-ordered Fluval E-200 a week later. I had absolutely no confidence that it could relegate my current 200-watt heater to backup duty, so it and the other two Fluvals' went back to whence they came. These heaters are great concepts, but if they don't perform their primary function, then they aren't worth squat. It is like buying a cell phone that has all kinds of nifty features but can't make a phone call. At nearly 3 times the cost of a standard heater (and an increase in size) they should be able to do more than lesser wattage heaters can. They should also have a lifetime warranty in

Comments: I have it in a seahorse tank and don't have to worry about them hitching and getting burnt. Easy to use.

Comments: Heater works great as advertised. I replaced the original stealth heater I had for 4 years with this unit. Works well and holds the temp in the tank to within 1 degree.

Comments: Since setting this heater up in my 55 gal tank, the temperature is continually steady and only varies slightly if at all. So far a very reliable product.

Comments: easy to use and solid as far as function and ease of use.

Comments: I just moved a mature mini reef system from a 15 to a 25 gallon tank. I had to upgrade my heater and wound up purchasing this E Series Fluval.
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<br />I am very impressed. The build quality is exceptional and the features are second to none. The digital display takes the guesswork out of setting the temperature and makes it easy to monitor any changes that may occur during the day. At the moment, I am using a 70 Watt Metal Halide which tends to push the temperature up from the 75 degree setting to just shy of 77 during the day. Just a quick glance at the digital display is all I need to monitor it. Also, at some point, (1 degree difference?) the display color goes from green to red. If the temp droppeds, it would change from green to blue.
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<br />Set temperatures match my old school floating thermometer. While I don't have the tools to say that's right on the money or not, I tend to believe in these old analog thermometers so I'm thinking the Fluval is accurately providing the desired temperatures.
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<br />It's just a heater but it's a critical component any system and this particular model appears to do the whole job including letting you see current temperatures at a glance. I highly recommend it.