E 100 Watt Electronic Heater

The Fluval E200 electronic heater has been rock solid in my aquarium. What really sets it apart is the temperature stability and accuracy. Once set, it maintains the water temperature extremely well without noticeable swings, which is critical for fish health. The digital display is clear and easy to read, and I appreciate being able to adjust the temperature precisely instead of guessing with a dial. The heater reacts quickly when the temperature drops and shuts off properly once the target range is reached. Build quality feels premium and well thought out. The protective casing adds peace of mind, especially in tanks with active fish. It also feels safer than traditional glass heaters thanks to its internal safety features. Pros: • Very accurate temperature control • Clear digital display • Stable heating with minimal fluctuation • Strong safety design and quality build • Ideal for medium to larger aquariums Cons: • Higher price than basic heaters • Takes a bit of space in smaller tanks Overall, this is a reliable, high-quality heater that’s worth the investment if you care about consistency and safety. Perfect for anyone upgrading from basic heaters or running a larger, more sensitive setup.

When I upgraded my aquarium from a 25 gallon high to a 30 gallon my old E100 was no longer powerful enough (despite the E100 indicating it was good up to 30 gallons). I purchased a E200 which works great. This is an excellent heater that is easy to set and monitor. Note: the digital display on the E200 that was sent was faulty and so I returned it and the replacement has no issues.

I have been using this product for about 4 months and it has worked great. I got this one compared to the E200 just because it was a buck or two more. I have a 55 gallon Texas Map Turtles / Guppy Kingdom / and some lucky large snails. The E300 says it's made for anything 100 gallon and under so it handles my task well. I have read other negative reviews about this heater from people using tanks over 100 and even 150 gallon and even installing it wrong....if you read and follow directions this will work for you. I like the casing it has around it so no animal or anything can get close to the heat tube. It had suction cups that attach directly to the heat casing and they suction really well. I have not had to move mine at all even though I have 4 ninja turtle climbing and jumping off of it hourly. So structure wise its made pretty well. As far as heating the tank it has met my needs. I know this from a couple things. I also use some old school suction cup mercury thermometers and they are in line with the correct temp readings. Also since I had hatchlings I wanted to raise my temp to 81 instead of the 77 it was staying at (I got it in december the cold months remember) it always kept it at 81 and now that the warm has come and there has been some really nice days I appreciate it even more because it flashes a differerent color and lets me know the tank is higher than the level I wanted it at. I set it for 81 but the sunny day made it a lil higher so it let me know. I clicked it down to 78 and it does the job still. I'm going to buy another one for my 75 gallon tank eventually. I will let you know how it performs for 75 gallons maybe at another time but for a 55 gallon it has worked perfect. It may work well for me because I have a tank 100 gallon and under. i positioned it under the water with just the temp. change click showing a little but you can put it deeper if you like (thats what sh....ahhh never mind) and I also put it in the path of my cannister filter flow out put. Heaters and filter work better with water flow not stagnant. This is what has worked well for me. I also might add I am using a cascade 1000 and two cascade 600's so I have constant water movement in the tank and on the heater. Like I said before water movement helps heating and filtration. For me....

It looks good in the tank especially with the digital thermometer. However, I feel when I first set this up, it felt underpowered in my 40gal. I questioned if I had setup correctly and watched videos. Now it’s working okay. Temperature do range throughout the day. With my ac on, I feel it struggles to keep temp up even though it’s about 12feet away from the ac unit. I’d say, I’d recommend for smaller fish tank.

I received this product in a damaged and used condition, which was disappointing. The item clearly showed signs of white minral deposit on black plastic, and the packaging was in poor shape. I expected a new and undamaged product, so this was a letdown. I would advise caution when purchasing from this seller to avoid a similar experience.

I was having problems keeping my new tropical aquarium temperature stable, even though I was using the correct sized heater for my tank. So I did some research into my fluctuating heat problem. I found on the internet that my problem might be caused, by my house being too cold, due to me living in the countryside. It recommended that I used the next sized heater up from mine or to use 2 heaters to stabilize the temperature. Being that my heater I had was a 200 wat I decided to go for a 300 watt heater. My next problem was, which make to go for.. For this again I turned to the internet, on the reviews done on the different makes. I was guided towards the "Fluval E300" by being one of the top recommended by the review web sites. From there I went on the Amazon web site. I checked the customer reviews. They were very mixed, in their opinions. So I was unsure but noticed there was a couple of reviews that stated that if you followed what they had done, all was well & that would rectify those problems the other reviewers were having, while using this item. So it was at this point I ordered it, even though it was quite expensive compared to some others at Amazon. It arrived the next day via Amazon Prime Delivery. I eagerly unpacked it and swapped it over. I followed what some of the other reviewers had stated to do, just so I could get the best out of this heater. 1st; I placed it at a 45° angle in the aquarium, as per the other reviewers advice. 2nd; I made sure it had a good water flow over it 3rd; adjusted the temperature to what I required. Then left it alone to hopefully sort out my heating issues. The next day I went straight to the aquarium, to check the temperature of it, against my other thermostat placed on the opposite side of the aquarium to the heater, I was very skeptical at this point. Well low & behold it was within 0.4°c difference. Since having this "Fluval E300" heater I have checked the temperature on numerous occasions and the temperature hasn't changed, even during the night, when it is at it's lowest room temperature. I would definitely recommend these "Fluval E series" heaters but just be guided by the above advice and other helpful reviews please, and it will be a great product for you, just as it is for me 5++ highly recommended item time has moved on now and at least 6month & still the heater is perfect keeping good temperature

The best heater I’ve ever bought for my 200 litters aquarium. Incredibly accurate! Well designed, and perfectly safe!

Bundan önce farklı bir marka kullanıyordum. Onda kalibrasyon gerekli olduğu için biraz uğraştırıcı oluyordu. Bu ısıtıcı tak, ayarla ve istediğin ısıya ulaş tercihiyle ön plana çıkıyor. Aynı zamanda çok dayanıklı görünüyor. Dijital ekranı ise onu rakiplerinden bir adım öne çıkarıyor.

Very well made thermostat. The outer protective casing is great to avoid fishes being scalded. Nice feature from Fluval. Setting the temp is also very easy with the toggle switch to increase/decrease temp value. The display is large enough for easy readout under water and is very clear. Would reccommend it to all. Been using it for just 2 weeks now. No issues as of yet, fingers crossed. Will update review if anything more to be reported for a long term review.