Tetra HT Submersible Aquarium Heaters
Easy-to-use submersible heaters automatically maintain aquarium water temperature at 78°F (±2°). Tetra HT Submersible Aquarium Heaters feature an electronic thermostat that adjusts heat output to maintain constant water temperature. Preset heater technology reduces the risk of overheating and prolongs the life of the heater.
| Feature | Description |
|---|---|
| Fully submersible preset heaters | For aquariums up to 40 gallons |
| Electronic thermostat | Automatically maintains aquarium temperature |
| Indicator light | Allows easy visual confirmation of heater operation |
FAQ
What is the maximum aquarium size supported by this heater?
The Tetra HT Submersible Aquarium Heaters are suitable for aquariums up to 40 gallons.
Does the heater have a temperature display or control?
The heater features an electronic thermostat that maintains a consistent temperature of 78°F (±2°) without manual adjustment.
Can I see if the heater is working without turning it on?
Yes, an indicator light provides visual confirmation of heater operation.

Gabrielle Mackenzie –
This heater has been running smoothly in my 35-gallon tank for over six months. The temperature stays stable even during colder nights. The indicator light is helpful to know it’s on. No issues with overheating or power fluctuations.
Jessica Mills –
Works well in my planted tank. I appreciate the preset temperature control. It’s easy to install and doesn’t require constant monitoring. A little noisy at startup, but that’s normal.
Victor Black –
Perfect for maintaining a consistent temperature in my freshwater aquarium. The thermostat keeps the water exactly at 78°F. I’ve had no problems with it since installation.