Zoo Med BettaTherm Submersible Betta Bowl Heater 7.5 Watts

I almost gave up on finding a heater that actually lived up to the standards in their descriptions. Two others that I tried never went past 72 degrees, although the descriptions said they went to 78 degrees. This little BettaTherm heater is the absolute best. It stays at a consistent 79-80 degrees. My Betta, Clifford is just thriving in his 2.5 gallon bowl. He is so much more active since I put in this heater. This heater takes up no room, is flat and covered by your rocks on the bottom of the bowl. There is a suction cup that holds the cord nicely against the side of the bowl. I would say..stop looking at other heaters, this is the best out there.

The heating power of this product is way underestimated.

It says it can raise a 1-3 gallon tank 5-10 degrees above room temp. I woke up the morning after i installed it and found my 2.5 gallon betta tank at 86 degrees with a room temp of 65. I'm glad i didn't buy this product in the summer or he'd probably be dead.

Without any kind of built in thermostat you have to constantly monitor your tanks temp and plug or unplug the heater.

It might be safe for a 5 gallon but if your tank is any smaller than that this heater is too powerful.

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Just want to warn people that this heater is a fire hazard. Mine was only 4 months old when today I walked out to see smoke

coming out of my aquarium. Had I not been home I don't even want to imagine what would have happened. There was quite a bit

of smoke in our home and when we were able to get our Betta out and check to find out this heater was melted. I am still shaking from this

experience and I plan on contacting the manufacturer.

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Bought it , put it in my 1.5 gallon tank for my big healthy beautiful beta. Room temp 65 degrees, went to work, came home to find my fish DEAD and the TANK WAY TOO HOT! If I could give it negative stars I would. Sure it's great, if you're trying to COOK FISH.

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I've had this heater for a few days in my 1 gallon bowl, and it certainly does well at keeping the water warm. You can't set it to a specific temperature, though, so you really need to keep an eye on how hot your water gets. My room temperature is at about 70 degrees, and this heater usually keeps the water at around 80. Sometimes, though, especially after it's been on all day, it gets up to more like 85, and that's a bit too hot for my betta.

Basically, this heater is nice to have, but buy yourself a thermometer to go with it, and don't let it go unwatched for very long.

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