Fluval T300 Fully Electronic Heater for Freshwater Aquariums up to 80 Gal.

My cichlid cracked the base of the original while she attempted to attach her reflection. A wild girl and fortunately not hurt. It worked perfect for over 3 years. Excellent and easy temperature control.

I have been using this for 14 months with no issues it holds a good temp. What is more impressive is the Saftey off…. I drained the tank today while distracted and forgot to unplug the heater… I thought it was toast, but to my surprise it is functioning fine and it holding at perfect temperature after re filling the tank. That feature alone would warrant a repurchase if I am in need of another.

I’m a believer in mild overkill when it comes to heaters because I like to keep my house cold. I got the 300 watt heater for a 55 gallon tank. In 3 hours it safely took my (new, uninhabited) tank from 67 to 78 degrees. I like the (mostly) black design that blends into my painted black tank background and the aesthetically pleasing light ring that displays whether it is currently heating or not. The adjustment dial seems to have a lot of little notches if not a continuous spectrum of temps to choose from. One minor annoyance was that when I pulled the product out of the box, the black heater guard that goes on the end was stuck in a bit of styrofoam way down in the bottom of the box. I almost threw the box away and assumed I’d just gotten one without all the pieces. Then when I applied it to the already-wet heater, it popped off a couple of times. It’s not strictly necessary for my needs since my heater is safely tucked away in a vertical position where fish can’t get to it, but still, watch out for that.

This heater almost killed my fish, it would not heat a 30 gallon tank. I tried everything following the directions to the T, would not heat at all. The fluval m series works great compared to this one.

Does its job flawlessly.

I purchased the T300 in April this year. In September I noticed the pilot light was almost to dim to see, Looked like a burning ember. I questioned FLUVAL customer service with a picture. They told me to cut the electrical cord and send a picture of the disabled heater and a photo of the heater label and a photo of my receipt. Since I bought it through AMAZON I had POP. Within a couple days I had a box at my door with a new T300 heater. Now that is service.

Nothing negative to say. It is a really well designed unit and pretty much disappears in my aquarium. Was easy to adjust temperature as well as the indicating light is way better knowing it is working properly even when it isnt actually heating. My future aquariums will have this series heaters from now on.

It is generally known that aquarium heaters of most brands are hit-n-miss these days, so I went for the Fluval T300s for our 75-gallon tank. The first one wouldn't hold the temperature steady within even 10 degrees. The second one just quit working. We sent the first one back. Since the second one lasted just past 30 days, we can't get a return for a refund or replacement through Amazon. It's possible we got 2 duds in a row, but it's just as possible that these were just poor-quality heaters. Update: After reaching out to Fluval, they did exchange the second heater, so credit to them for backing up the product.