I currently have a Zoo Med Betta Therem Mini Size Betta Bowl Heater (http://www.petsmart.com/product/inde...5060&lmdn=Fish) under the marble substrate. It has always kept things at a perfect 81 degrees F. I know the horror stories of bad heaters and have been keeping an eye on it like a hawk. Today the temp dropped a degree. Maybe I'm paranoid, but I think I would be much more comfortable with a heater with a built in thermometer. Any recomendations?
I'm not sure about the biOrb/biUbe heater, but then again, not too many people have written reviews for it. You should probably browse some other sites about the heater and see if it comes out the same or not. I know when I was looking through heaters, I asked some people on this site, and the best one I came across by far was this one:
I don't believe it has a built in thermometer, but overall, out of all the sites I've seen for it, there have been a lot of reviews for it (not just on this site, I just bought it here because it was the cheapest I could find), keeping it at a 4 star rating, but in comparison to most heaters for small tanks, all of them usually have a rating of 3-3 1/2 stars. Essentially from what I could find is that with some of the heaters, there are a few kinks here and there, but nothing major.. And even so, it's manufactured and you're bound to get a few bugs every now and then- it's not a perfect system. Otherwise, I don't recall anyone complaining about the heater and saying they bought/traded it in for another one and saying the second heater was a POS as well... but that's just what I've come across when looking for a heater recently. I've already bought it, and I am waiting for it to come in the mail. If anything, I'll let you know how it works if you'd like ^.^
I was so happy with it that I bought one for my new 2 gallon Spec (10 watt). Works great. Nothing to set, it keeps the tank right at 78-79 degrees, no fragile glass to break, seems to be built well. The 25 watt version that I have in my 6.5 gallon Fluval Edge has been going for over a year now with no problems.
Yes, be sure to get the adjustable ones! I lost a betta in a QT with a non-adjustable Hydor heater that went bonkers. :(
You have to be careful with the non-adjustable heaters. Some of them have no shut off. The Hydor (pad style) heaters don't have one. They just heat depending on the wattage. The Marina, Fluval and Marineland heaters actually have circuitry to shut them off at a certain temperature. It works just like the heaters that you can set, but they are preset.
I have two of them and I have had no problems yet.
I have several 2 gallon Kritter Keepers that I use as quarantine tanks. I use Aqueon Pro 50watt heaters in all of them and they work really well. They are fully submersible, adjustable, and don't have any breakable glass components. They also come with a lifetime limited warrenty. I had one of mine go out a few months ago and Aqueon was really good to work with. They sent me out a new one hassle free and I got it about four days later.
I know you've had enough recommendations, but a lot of people here also recommend the hagen mini elite 25 watt heater. I have ended up with several of them and they are great. And adjustable. You can get them on amazon or here http://www.kensfish.com/hagen-elite-...e-heaters.html