Tetra HT Submersible Heater Review

Tetra HT Submersible Heater Review

The Tetra submersible heaters are one of the most popular choices for new aquarium keepers. This is probably because they are easy to use and often available at large retailers such as Walmart. The heaters come in several sizes.

HT10 (50 watt) – 2-10 gal
HT30 (100 watt) – 10-30 gal
HT40 (150 watt) – 30-40 gal
HT55 (200 watt) – 40-55 gal

Over the years I have owned many of these heaters in all of its sizes. From the first aquarium I stared nearly 15 years ago to recently picking one up in a pinch. I still own 2 or 3 that I occasionally use to heat saltwater for water changes.

Tetra submersible heaters all come preset at 78 degrees. There is no way to adjust that temperature. This may be viewed as a pro or a con. 78 degrees is a typical temperature for most aquariums so this generally is not a problem. Being preset from the factory does save the hassle of trying to set the proper temperature yourself.

Tetra HT Submersible Heater Review


Reliabiity is the most important factor when considering a heater. In my experience I have only had one of these heaters fail. The heater what about 5 years old and was the primary heater in a 29 gallon. It failed off and the tank slowly cooled down. I noticed the drop in temperature soon enough to swap out the failed heater with no adverse effects.

Tetra has a 2 year warranty on its heaters. Given mine and other friends experience with this heater I would suggest replacing it every 2-3 years regardless.


  • Preset to 78 degrees.
  • Indicator light. When the aquarium is at the proper temperature a small green light illuminates. When the heater is on a red light illuminates.
  • Affordable.


  • Shaky reputation for reliability.
Tetra HT Submersible Heater Review


A heater is one of the most vital pieces of light support equipment in an aquarium. For that reason you should purchase the highest quality heater you can afford. If your budget only allows for a heater in this price range then buy this heater. Overall it is reliable and does the job it was designed for. Always have a thermometer in the tank and monitor it regularly however just in case.