Does this heater keep stable temperature? I've heard horror stories about preset heaters cooking the betta because temp went way too high .
1075809
Only if your room temperature is stable. It's always on, with no temperature sensor.
1075810
I use these heaters with my bettas and betta fry and the work great. Keeps water warm and does not over heat.I definitely recommend.
1075811
Yes, have had 2 in separate bowls for +/-1year. I have each on an outlet timer; 1.5hrs ON & 2.5hrs OFF 24/7. The suction cups don't hold for long, so I just keep them submerged vertically in the back behind some decorative plastic plants.
1075812
No, probably not in the sense you mean. This is an eight watt "always on" type of heater, it has no thermostat. The heater will continue to emit eight watts worth of heat whenever it is plugged in. With very few exceptions all small "bowl" or "betta" heaters work this way, the only difference is the wattage. They are available in 5 to 15 watts, you need to match tank size, ambient temperature, and other variables to heater wattage. A thermometer and monitoring is essential, especially at first to determine what temperature a particular heater keeps a particular tank, and if room temperature rises so will the water temperature. The term "preset" is not really applicable to these heaters, preset heaters have a thermostat that is permanently set at a certain temperature. If a heater description uses the term preset without stating a specific temperature (usually 78) then it is NOT a thermostatic heater- it is an always on type. In too small of a tank or too warm a room these can overheat the water. Bettas are very heat tolerant, which is why using these heaters is feasible, but care is still needed. In anything under 3 gallons I think eight watts may be more than needed unless in a fairly cool room.
1075813
Mine seems to keep it about 10 degrees above my room temp. It's not like you can set it at a temperature and it'll adjust itself up or down accordingly.
1075814
It heats the water to about 10 degrees above the temperature in the room. If the temperature in your house is stable, you should have no problem, but if it goes up and down, like it does in my stupid dorm room, you might want to get a thermometer and monitor it. If it starts to go a little over, just unplug it. This is not at the fault of the heater, however, I love this little thing and have no complaints.
1075815
It does remain stable at around 85'ish, which is pretty warm. If your tank is big enough, I'd suggest an adjustable heater for around $5 more so you can tweak the temperature.
693308
It is not a practical tank for adding a heater. Bettas usually do not need heater.
1227276
I breed bettas and would never recommend this heater. I had these in 2 1/2G tanks and found it to be very unreliable. You are so much better off getting a heater that you can set the temperature on.
1464506
Don't do that this heater is meant to be inside water or it will over heat. I use this with my betta fish and i change the water every week and when i change the water i pull the little suction cup off and put it in glass of water so you don't unplug again and again, then put it back in when you're ready and make sure to clean it once in a while just clean inside the water you're gonna throw away use your fingers you'll know hen its clean.
41957
This heater keeps the temperature in your tank a little above room temperature. If your house temperature fluctuates, then so will your tank temperature. For example, if your house is warm in the summer and cold in the winter, your tank temperature will be higher in the summer and lower in the winter. Also, my heaters red light does not flash on anymore but I know it is still working because I keep a tiny thermometer in my tank to monitor it, so don't worry if you don't see the red light.
233944
I use the 50watt in my betta tanks. (One gallon) and since its preset it shouldn't be to hot.
2073190
I've had a Betta Tank for 2 years and this thermometer has worked great so far. Between 50 and 90 degrees. I keep my Betta at 76 to 80 and it stays within 1 degree all the time. You would need some moister to keep the thermometer sticked to the tank however. A great tool anyway.
756595
I have this heater fully submerged in a 5.5gal betta tank and I have had no problems with it. When you get the heater and actually see it you can tell it is sealed very well.
703232
It is fully submersible. I use it in a 2 gallon tank for a betta, shrimp, and dwarf frogs. Also extremely accurate.I just took a look at the reviews. First of all, this heater is for a small tank, maybe max of 2 gallons. The room it is in stays about 68 degrees, and this heater maintains the water temp at 78 degrees. Secondly, it has a minimum water line, but the entire unit can be submerged. One reviewer said that he didn't know what the factory preset was, I put it, started it up and then adjusted it up to 78 degrees. I think the preset was probably 72. This was the smallest heater I could find that was controlled with a thermostat. It is fully submersible. I use it in a 2 gallon tank for a betta, shrimp, and dwarf frogs. Also extremely accurate.I just took a look at the reviews. First of all, this heater is for a small tank, maybe max of 2 gallons. The room it is in stays about 68 degrees, and this heater maintains the water temp at 78 degrees. Secondly, it has a minimum water line, but the entire unit can be submerged. One reviewer said that he didn't know what the factory preset was, I put it, started it up and then adjusted it up to 78 degrees. I think the preset was probably 72. This was the smallest heater... » Read More It is fully submersible. I use it in a 2 gallon tank for a betta, shrimp, and dwarf frogs. Also extremely accurate.I just took a look at the reviews. First of all, this heater is for a small tank, maybe max of 2 gallons. The room it is in stays about 68 degrees, and this heater maintains the water temp at 78 degrees. Secondly, it has a minimum water line, but the entire unit can be submerged. One reviewer said that he didn't know what the factory preset was, I put it, started it up and then adjusted it up to 78 degrees. I think the preset was probably 72. This was the smallest heater I could find that was controlled with a thermostat. « Show Less
1951251
When the room temperature is close to the optimal temperature for bettas (75 to 80F or so) leave the heater off. All it does is add heat to the water so if it is on the tank will get too hot.
2095954
You can't set a temperature. It has a "preset" temperature. Supposedly it should shut off when that temperature is reached, but it does not. It raised the temperature in my 2.5 gallon tank to 90F ... Almost killed my fish and my plants ... I don't recommend this heater.
265793
Yes it will work. I have on in my 5.5 gallon filtered tank and this heater has been consistent with 80 degrees temperature for my betta tank. I got it seven months ago and it is still good. I highly recommend this heater! :-)
1859536
really depends on how much you need to raise the temperature. This model burnt out on me after a month, the glass cracked and when that happens, usually you loose all of your fish and sometimes even the tank (it can in some cases blow out the fish tanks glass as well). I'd recommend the aqueon pro models. they are much more accurate, and being housed in a high density plastic there is little risk of them blowing up your tank. Aqueon Pro Heater
866338
There are 2 temps, high or low. I only use the heaters in the bathroom as needed and don't keep them on longer than an hour. They have never overheated, but I wouldn't trust any electric heater left alone for a long time. Excellent heater
646369
I have this heater in a 3 gallon picotope. It is set to 76F. I haven't watched it for fluctuations, but I have had Endler's Live Bearers in the tank for several months. They are thriving, lots of fry. Hope that helps.
349593
I am unsure about heating a Fluval 5 with this heater. I had no problem with the same scenario (set up heater at 78 degree in a 68 degree room), however I have a Fluval Spec 2.5 gallon tank.
1560140
I have a one gallon tank for my betta. My room temperature was around 66 degrees F so way too cold! This keeps it around 78 degrees F steady though a betta should be in a desired 80 degrees F. You can assume it will raise your temp about 10-12 degrees so if your room temperature is anymore than 70 degrees, you run the risk of over heating the tank. Be sure to keep a close on the temp with a thermometer if your room temperature is higher and be sure to unplug the heater if too much.