Orlushy Submersible Aquarium Hea... vs Marina Betta Submersible Heater ...

The thermometer alone is $7-10 and you’ll need one of those anyways. First test you're heater in a bucket to dial in you're temps and make sure the heater works. Will continue to monitor the temp.

Completely submersible, accurate and strong. Knock on wood. But i'm impressed with this one working so well.

Bought 2 of these to use in saltwater quarantine tanks. I have a small 5gal quarantine that was at 80 degrees and the thermometer read 78. Used this in my 55 gallon works perfect. The heater is accurate instruction even say that it -3 degree differenc...  Read More

It still puts out a tiny bit of heat, but you can’t get the water to reach 82 degrees, even cranked up to 94. Lots of condensation on the lid. Only reason i kept them is that i found an external thermostat, and an nist certified thermometer that i wil...  Read More

It keeps my tank between 76-82 degrees.

It only heats, and heats, then heats some more. It works by just heating the water in the tank while the heat also escapes into the surrounding air. The water was overheated.

Caveat emptor. I wish i'd spent a little more, & gotten one that would work for a longer period of time. Don't usually even write reviews.