4 Best Betta Fish Tank Heaters for 1, 5 & 10+ Gallon Tanks – 2024 Reviews & Top Picks

Betta fish are tropical fish that require tank heaters to maintain an appropriate and stable water temperature. Room temperature water is rarely warm enough or stable enough to meet their needs. Choosing the right heater for your Betta’s tank is important to ensure the temperature stays at a safe, comfortable level for your Betta fish.

Regardless of the size of the tank your Betta lives in, there’s a perfect heater to meet your needs. A heater that’s too powerful can result in the death of your fish, but a heater that’s too weak can result in illness, so choosing the right heater will help keep your Betta safe. Here are reviews of the best of the best heaters for your Betta’s tank, no matter the size.

A Quick Look at Our Favorites in 2024

Rating	Image	Product	Details
Best for 10-Gallon Tanks		Fluval Glass Aquarium Heater	Shock-resistant casing Heats tanks up to 15 gallons Temperature range of 18˚	Check Price
Best for 5-Gallon Tanks		Cobalt Aquatics Aquarium Heater	Shatterproof case Built-in thermal protection circuit Suction cup attachments included	Check Price
Best for 1-Gallon Tanks		Marina Betta Submersible Aquarium Heater	Durable polymer case Fully submersible Automatically restarts	Check Price
Best for Tanks Over 10 Gallons		Eheim Jager Thermocontrol Aquarium Heater	Accurate within 0.9˚ Dry run shut-off mode Can heat tanks up to 264 gallons	Check Price

The 4 Best Betta Fish Tank Heaters Are:

1. Fluval Submersible Glass Aquarium Heater 50-Watt – Best for 10-Gallon Tank

The Fluval Submersible Glass Aquarium Heater is the top pick for a 10-gallon Betta tank. This heater can heat tanks up to 15 gallons and is accurate within 1 degree. It is encased in shock-resistant borosilicate glass, reducing the risk of cracking, even if bumped. It attaches to the inside of the tank via suction cups.

You have an adjustable temperature range of 18 degrees, allowing you to set it to the perfect temperature for your Betta fish. It’s made with a unique reflective casing that helps camouflage the heater within your tank, making it barely noticeable.

This heater is quite tall at 11 inches, which may be too tall for some 10-gallon tanks. There is a fill line mark on the heater itself and the water must at least hit this level to ensure the heater does not break.

2. Cobalt Aquatics Electronic Neo-Therm Submersible Heater – Best for 5-Gallon Tank

The best heater for a 5-gallon Betta tank is the Cobalt Aquatics Electronic Neo-Therm Submersible Aquarium Heater. This compact heater can heat tanks up to 6 gallons and has an adjustable temperature range of 30 degrees. It includes a one-touch setup and has a shatterproof case, preventing breakage if bumped. It attaches to the inside of the tank via suction cups.

This thermometer is accurate within 0.5 degrees, making it a great pick to keep your Betta fish safe. It also sets itself back to the previously set temperature after turning back on after a power outage. It features an LED display that shows you the set temperature and the current tank temperature. It also has a built-in thermal protection circuit that causes the heater to shut itself down if it senses itself beginning to overheat.

Although slim, this heater is black and noticeable, especially in a small tank. The bottom of the heater should always be submerged to prevent the heater from breaking.

3. Marina Betta Submersible Aquarium Heater – Best for 1-Gallon Betta Tank

The best heater for your 1-gallon Betta tank is the Marina Betta Submersible Aquarium Heater, which is intended to heat tanks between 0.5–1.5 gallons. It is preset to approximately 78 degrees F to maintain your Betta’s tank at the perfect temperature. It’s encased in durable polymer to prevent breaking and uses suction cups to attach to the tank.

This heater is fully submersible, so you can put it just about anywhere in your small Betta tank. After a power outage, it will automatically turn itself back on and begin warming to the pre-set temperature.

Since this heater has a pre-set temperature you cannot adjust, it’s a good idea to invest in a thermometer to ensure the water temperature is staying within a safe range. It’s encased in a black casing, making it noticeable, especially in a small tank.

Related Read: Top 5 Best Fish For 1 Gallon Tank (With Pictures)

4. Eheim Jager Thermocontrol Aquarium Heater – Best for Tanks Over 10 Gallons

The Eheim Jager Thermocontrol Aquarium Heater is the best pick for tanks over 10 gallons. This heater is available in seven sizes up to 300 watts, which means this heater can heat tanks up to 264 gallons. For a large Betta tank, you’ll likely want the 75-watt model, which heats tanks from 15–26 gallons.

It’s adjustable from 68–90 degrees F and is accurate within 0.9 degrees and uses double suction cups to attach to the tank. This heater is encased in special lab glass that helps keep the temperature levels in the tank stable. It includes a dry run shut-off, so if the water level gets too low, the heater will shut itself off before the glass breaks.

The casing is not reflective, so the heater may be noticeable in your tank. It also may be too tall in shorter tanks, so you may have to install it at an angle, making it more noticeable.

Buyer’s Guide: Choosing the Best Betta Fish Tank Heaters

Why Does a Heater Matter in Your Betta’s Tank?

Betta fish are tropical fish that require warm water. They can live in temperatures from 72–82 degrees F but they truly thrive in temperatures from 78–80 degrees F. One of the most important aspects of the temperature in your Betta’s tank isn’t just the temperature itself, but it’s the stability of the temperature. If the temperature is always fluctuating within a 10˚ range, then your Betta will be stressed and become susceptible to illness. Rapid fluctuations in temperature can even lead to temperature shock, which can cause death. Choosing a functional and reliable heater will help you ensure your Betta fish tank stays at a stable and safe temperature.

Choosing the Right Heater for Your Betta’s Tank

Size

Choose a heater that is appropriate for the size of your Betta’s tank. Choosing a heater that is too high wattage for the needs of the size of your tank can result in rapid temperature fluctuations and overheating, which can kill your Betta fish. If you choose a heater that is too low wattage, then you’ll end up with the opposite problem. Bettas that are kept in water that is too cool become susceptible to disease.

Tank Layout

Keep the shape of your tank in mind when choosing a heater and determining where you should put it. If your Betta is in a tank that is 3 feet long, then putting a heater at one end of the tank may cause uneven heating of the water. You’ll want to ensure your heater is able to be in a somewhat central location of your tank to ensure the water is heated evenly throughout the tank.

Features

Some heaters come with features like LED displays and built-in thermometers, which can be beneficial to help you monitor your tank more closely. Some heaters are very plain and don’t include special features, with some not even allowing for temperature adjustments. Choosing what types of features you’re interested in can help guide you in selecting a heater.

Our Betta Fish Tank Heaters for 1, 5 & 10+ Gallon Tanks Selection Process

When it comes to selecting products, Hepper has a committed team of writers and editors who work closely with licensed veterinarians to find the very best in today’s market. Together, they consider customer feedback, brand reputation, veterinary expertise, and whenever possible, hands-on testing. We aim to select and review the highest-quality products to help you make informed choices that meet both your and your pet’s needs.

Why Trust Hepper?

Since 2007, Hepper has been a trusted and growing online brand and resource with the edge of creating and retailing our own line of cat furniture, toys, and gear, and pet consumables, giving us valuable insights into how to choose tank heaters for different tank sizes. Our driven team of pet-loving writers, editors, and veterinarians is dedicated to empowering our readers to make the best decisions for their animal companions. Our priority lies in providing top-notch information and recommendations. Our team is genuinely invested in the health and well-being of all pets worldwide, believing that expert knowledge is crucial for achieving this goal.

Final Thoughts

Regardless of the size of your Betta’s tank, there’s a heater to keep your Betta fish safe and comfortable. For 1-gallon tanks, the best pick is the Marina Betta Submersible Aquarium Heater, since it is intended for tanks 1.5 gallons and smaller. For a 5-gallon tank, the Cobalt Aquatics Electronic Neo-Therm Submersible Aquarium Heater is the best option available, and for a 10-gallon tank, look no further than the Fluval Submersible Glass Aquarium Heater 50-Watt.

Using these reviews, you can start your search for the perfect heater for your Betta’s tank. It doesn’t have to be an overly complicated task to find the right heater, but it is important to choose a heater with high functionality and safety features that will ensure proper water heating and safety for your Betta fish.

See Also:

• 5 Best Filters for Betta Fish Tanks – Recommendation & Top Picks
• How to Choose the Best Substrate for Betta Tanks

Featured Image Credit: Andrej Jakubik, Shutterstock