6 Toasty Betta Tank Heaters (no affiliate links :)

Unless your house is kept at 78 to 80 degrees Fahrenheit, you need a Betta tank heater to keep your Betta active and healthy.

Fluval Marina Submersible Heater for Aquarium, Mini

This Fluval Marina Submersible Heater for Aquarium is a small yet powerful heating provider for both freshwater and saltwater aquariums. This heater comes in a 25 watt model for up to 5.5 gallons and a 50 watt model for 10 gallons tanks. It is an inexpensive submersible heater that at only at 6 inches length can find a home in one of the smallest and oddly shaped Betta fish tanks.

It includes bracket and suction cups which makes installing it a breeze and can be easily adjusted to heat the tank to your desired temperature. Moreover, it comes with an impact-resistant glass design along with a waterproof sealing.

FREESEA Aquarium Fish Tank Submersible Heater

The FREESEA Aquarium Fish Tank Submersible Heater with LED Temperature Display is available in 50-, 75-, 100-, and 200-watt models. This heater offers a good display that offers accurate temperature readings. There is no need to buy a separate thermometer. Furthermore, it features a constant temperature function that turns off the heater when it reaches a predefined temperature. This helps in preventing the water from overheating.

Tetra HT Submersible Aquarium Heater

The Tetra HT Submersible Aquarium Heater features a helpful indicator light. The light is red during heating and green when the suitable temperature has been achieved. This heater comes with a built-in electronic thermostat that maintains the temperature of water at 78 degrees. No, it's not adjustable, which may be a plus or minus depending on your needs.

The Tetra HT Submersible Aquarium Heater works ideally for aquariums between 2-10 gallons size. It can be put both horizontally and vertically in an aquarium. Since it has a reasonably small size, it does not take much space in your Betta fish tank.

Eheim Jagger Aquarium Thermostat Heater

The Eheim Jagger Aquarium Thermostat Heater can go down to 65 degrees, perfect for those who live in hot areas where the goal of their heater is primarily to keep the temperature of water consistent. It comes in a variety of different power ratings, with the 300-watt version being rated for up to 100-gallon tanks.

At 20 inches, this heater requires a tank that can accommodate its dimensions. It features an easy-to-read temperature dial that can be adjusted in 0.5-degree increments. 

Aqueon PRO Submersible 50W Heater

The Aqueon Pro Submersible Heater features an adjustable heating setting that ranges from 68-88 degrees. It features an LED light that is red during heating and green when the desired temperature has been achieved. You don’t need to worry about overheating, since it automatically turns off when it is at the set temperature.

This Aqueon heater is fully submersible, and comes with an electronic thermostat. Moreover, it can be used for both saltwater and freshwater tanks. It can be positioned both horizontally and vertically.

ViaAqua 50-Watt Quartz Glass Submersible Heater

The ViaAqua 50-Watt Quartz Glass Submersible Heater includes fully adjustable temperature and a clear display. The quartz glass construction makes it durable and high quality. At 8.2 inches length, this heater is fit for a tank size of up to 13 gallons. It comes with a built-in thermostat that allows a temperature range of 68-93 degrees. This heater does a great job of maintaining a consistent temperature.

It may require a separate thermometer, as the built-in thermostat may need to be double-checked for accuracy.