Tetra Submersible Heater 50 watts for Aquariums up to 10gal Aquarium and Terrarium Tools

The water is up to 76. My 10 gallon heater has my 8 gallon betta tank at 76 when a betta needs 76-82 and I cannot raise the temperature. It's the end of 2025 and we still have notices on the box about an app. Not impressed

Light comes on occasionally but water temp is less than 72 degs. Tried several different test thr thermostat inside is set to somewhere around 68 not 78 like its suppose too! I have the 20 gal tank one

The box says it has an app… that is false it hasnt been available on the App Store since August 15 2023. I bought this January 2025. (Please take it off ur box) thanks

None of them broke or stuck. Steady 78f in my reef tanks.

I bought mine today notice it indicates red but doesnt last long on it then turns to green seems to stay in that color. Wondering if thats normal cause its not heating my tank.

Bought this 2 days ago then I heard people are buying two of them no thanks.

I've had my first tetra heater for 10 haply years in my 10gallons. Upgraded tank to bigger one and figured id get the same model as the first one since it wasn't up for it. I set it up and didn't stress much about the fact it took a long time to get the tank to set temp. Day 2 i Noticed it looked humid inside but google mentioned it was normal. Today my most my precious fish are dead. They basically boiled. I removed my air stone and saw the heater leaks tiny bubbles. not only the amount of money gone just like that but i watch thos fish grew and got attached to them. This sucks. 3 days. This morning everything was fine. Couple of hours is all it took to ruin years of trust in the brand. I'm done. This is outrageous

DONT BUY FOR THE PRICE ITS HORRIBLE DOES NOT WORKI HAVE HAD ISSUES HEATING MY AQUARIUM SINCE I BOUGHT THE HEATER YESTURDAY

Woke up to the smell of burning in my room around 3:45am today was concerned it was my new mist system for my gargoyle gecko. Then realize theres little black specks and water all over my room my mirror the ceiling. Then step on something turns out its burning heater parts that burned a hole in my carpet and foot. Wonderful way to wake up when I have a 7am class tomorrow. So now I unplug my two inkbird controllers for my heaters I was only using this heater as a backup since my other one wasnt getting up the temperature I wanted. Try to find the heater which was in the back of a tank with built in filtration and it isnt there. Its laying across the room unplugged itself from the heater about six inches from my head. The rest is on top of my 29 gallon next to the tank that had this heater and whatever else is sprayed on my ceiling and bed or burning into my carpet. Absolutely ridiculous that a practically new heater exploded I bought it two months ago but it had only been running two weeks. Was keeping the tank at 76° fully submerged and I cannot come up with a reason for this happening other than it being a crap product. These heaters often come back into the store I work at with complaints of them stopping heating the tank after a few weeks but never this so far. I now get to enjoy the smell of burnt carpet and finish cleaning up the mess of the explosion before I get up at 5:30. Thanks Tetra!

I bought the 50 W for a 5 gallon. After 3 days our fish died the water temp was cold never heated properly even with the signal going green for three days save your money buy another brand..

Put into my fish tank. Works awesome I love it I put 2 into my 70gallon tank fish are happy

I've got a graveyard of ten of these. The last two I've gotten didnt last two months. That's not counting all the ones I've returned. I've lost so much money on these. Kept giving them the benefit of doubt but sadly my mistake. Dont waste your money or time.

I bought the 100w and didn't heat my 10 gallon tank.

Ive had the tetra 2-10g heater in my 5g betta tank for about a year now it works great it keeps the water at 77° The heater does need to be completely under water at all times unless you unplug it I think that could be why theres so many bad reviews

Doesn't work lost 2 fish tank is cold total waste of money would not recommend

I got this a 10g submersible heater from petco about a month ago. It kept the temperature of my tank at 77. Now fast forward a month later my tank is maintaining a temp at 72.

I have the 50 watt one it keeps my tank warm and my fish happy!

Don't buy it killed all my fish cook them to death

I have been using the Tetra 50 Watt heater in my 8 gallon tank for several months and the temperature stays at 78 as advertised. I like that the green light indicates power and the red light indicates heating.

I bought one 2 weeks ago and it has done absolutely fabulous at staying right at 78° in my 2 gal. Bought another one a few days ago for my 5.5 gal. The light turns red and green but the heat won't go above 74° and my poor betta is staying cold. He stays right by the heater all day and idk what to do:( Now I'm worried if the first one that works well won't do well in the 5 gal I bought to upgrade her tank.