Do Betta Fish Need A Heater? (Top Picks and Reviews) 2021 is supported by our readers. When you buy through links on our site, we may earn a commission.

You may know the betta fish as Siamese Fighting Fish. They are popular household pets because of their bright colors and easy maintenance. Although they are easy to care for, these brightly colored fish have specific needs in order to thrive.

Surprisingly a lot of people think it’s okay to house their bettas in a bowl or vase. Yes, the fish will survive in these conditions but that doesn’t mean they are doing well. If you look closely you may notice those fish are stressed out which causes them to pass away sooner than a fish in the right environment.

Betta fish are tropical fish so they don’t do very well in cold water. Especially if that cold water is dirty. If your Betta gets too cold(water temperature is below 74°F), your betta becomes more stressed. Sometimes, you may notice that your betta avoid eating as his immune system is weakening because of the stress. 

If you want your bettas to remain healthy then your fish need a heater. The heater is one of the most important pieces of equipment you can get for their tank. 

Remember that bettas are used to tropical waters so they will always do best when their water temperature is warmer than room temperature. The temperature of your home isn’t reliable for your fish tank because it fluctuates throughout the seasons.

A heater will ensure the betta fish’s environment always has a steady temperature. This will make up for the difference in temperatures in your home, especially if you use an air conditioner in the summer. 

What You Need To Know About Betta Fish Heaters

When it comes to betta fish heaters, the first thing we should talk about is your tank. If you use a tank that is too small then you could overheat the water with a heater and likely kill your fish. Always make sure you use a tank that is 5 gallon tank or larger.

(Check out the best tanks for betta fish.)

That being said, you should also monitor the water’s temperature and the heater’s settings just to be on the safe side. This will help you make sure your fish is happy in their environment. Here are some things you should know about betta heaters before buying:

do you need a heater for a betta fish

What Is The Best Temperature For A Betta Fish Tank?

Bettas are happiest and healthiest when they live in water temperatures between 74 and 82 degrees Fahrenheit. This is closest to their natural tropical environments and easy for betta to adjust to. Temperatures outside this range will affect the fish’s lifespan. To put this in perspective for you, the average house has room temperatures between 66 and 72 degrees which is way too cold for a betta. Not to mention a lot of people allow their house to drop in temperature at nighttime to the 50s or 60s. One more thing you should know about the temperature of your betta fish’s water. It needs to be kept consistent, so avoid keeping it around 73 one day then 79 the next. That will cause the fish just as much stress as cold water. Remember, massive stress will weaken your betta’s immune system. (If you need to know more about the ideal temperature for bettas, such as what happens when it becomes too hot or too cold.)

Figuring Out What Watt Size You Need

In order to keep the water in the tank consistently warm enough for the betta you will need to find a heater that has sufficient wattage. The ideal heater will have 3 to 5 watts per gallon of water. 

If you have a larger tank it’s recommended that you use two small heaters instead of one larger heater. This way you can provide a more even flow of heat at both ends of the tank. 

Avoid Cheap Heaters

You will notice that there are a lot of different heaters to choose from out there. It’s a good idea to get a high-quality heater for many reasons, but one in particular is adjustability. Adjustable heaters are a must-have, especially if you live in a climate where it gets really cold in the winter.

Easy To Read

Your heater must have a readable temperature scale. This makes taking care of your betta fish’s environment a lot more simplistic. You will always know when your fish’s tank is at the right temperature and can adjust it if it’s not. 

It’s a good idea to keep a thermometer near your tank too. Sometimes the water sitting around your heater is warmer than the rest of the tank, so the heater doesn’t always display the correct temperature. Using a thermometer in another area in the tank can give you a better reading.

Easy To Use Too

You don’t have time to waste messing around with a confusing heater. To make sure your heater is never going to play complicated games with you, always choose one with a large-sized control knob. This way you won’t be fighting with it to get the right setting when it’s submerged. 

Make sure your heater is easy to set up by looking for either a hanging feature or suction cups. They will help your heater stay in place once it’s in the water. 

Must Be Safe For You And Your Betta Fish

When you are picking out a heater for your bettas, always choose one that has been rated to be safe for full submergence. If you can’t submerge it in water then there is a good chance that both you and your betta fish could get electrocuted.

Another key safety feature that good quality betta tank heaters have is a safety-off feature. If anything happens when you are not there to deal with it, such as water dropping below the heater, it will automatically shut off. 

Accidents can happen, so it’s a good idea to make sure your heater is both shatterproof and shockproof. Most heaters are designed to be both. These features are lifesavers if you ever accidentally drop the heater.

One more thing to consider is your betta fish’s safety. Make sure the heater you choose has some sort of safety guard or even a protective case. This will keep your pet from getting near that heating element which can get very hot. 

Shape Of The Heater

Fish tank heaters come in a variety of shapes and sizes however, the smaller-sized ones are more commonly purchased. The most common style is a torpedo-like shape that sticks to the side of the fish tank. 

That isn’t the only style available. You can find rounded heaters that are designed to stick to the bottom of a fishbowl. Among the many styles, you can also find rectangular and flat heaters. There are heaters designed for pretty much every tank.

Betta in a one gallon tank

Our 5 Best Betta Fish Tank Heaters

Now that you know more about betta fish heaters and what features to look for in a good heater, let’s show you five of our favorite betta fish tank heaters. These safe and trusted heaters are the most reliable ones for creating a healthy and happy environment for your betta.

We know that there’s a vast variety of betta heaters available on the market. When you go shopping you will probably come across so many different heaters that seem like they could be the right choice. We’ve narrowed it down to 5 of the best heaters to make shopping easier for you.

Fluval M 50-Watt Submersible Electronic Heater

This submersible electronic heater from  Fluval is a favorite among customers. It’s best when it’s used with a tank that is around 15 gallon tank. It easily blends into its surroundings so you don’t have to worry about this heater bothering your betta.

Fluval is a trusted brand for fish tank heaters, and this M 50-watt submersible heater is no exception to that. Its exceptional performance will do its part to keep your fish happy with their home. Your fish will most likely enjoy the reflecting colors it creates.

The thermostat is computer calibrated so it’s very easy to adjust. You’ll be able to monitor the water temperature throughout the day. There’s no need for your fish tank’s temperature to drop just because you need temperatures to cool down in your home.

You can set the water temperature from the top of this heater, which makes it very easy to adjust as needed. A blue light in the front will let you know when it is heating, and it will shut off once your betta tank is at the right temperature. 

Fluval M50 Submersible Heater, 50-Watt Heater for...
  • Aquarium heater that blends into the aquarium environment with built-in reflective technology that...
  • Computer-calibrated thermostat and easy-to-adjust temperature control dial
  • Shock resistant Borosilicate glass and high density ceramic heat sick
  • Easy to install with slim profile tube for easy placement
  • 50-watt heater suitable for freshwater and saltwater aquariums up to 15 gallons with a 3-year warranty

Fluval E300 Advanced Electric Heater

Fluval makes our list of favorites once again with their E300 advanced electric heater. This heater has dual temperature sensors which is how it is able to give you the most accurate temperature reading of your betta fish’s tank. 

The thermostat can be adjusted to read in either Fahrenheit or Celcius, making it easy for everyone to read. You can always get the right water temperature because this heater has a range between 68 to 93 degrees Fahrenheit. 

You never have to worry about your betta’s safety because there are integrated fish guards to protect them from the heater. There is also a safety-off feature with fast technology that acts to shut off your heater when it needs to be. 

This heater also comes with a mounting bracket making it very easy to set up. It won’t take long before you get your fish’s house to the right tropical-like temperature. The display alert system lights up, making it easy for you to read too.

The Fluval E300 is a 300-watt heater, making it a great choice for tanks up to 100 gallons. It comes with a 5-year warranty just in case your fish isn’t happy with it. 

Fluval E300 Advanced Electronic Heater, 300-Watt...
  • Aquarium heater with dual temperature sensors provide accurate and real-time water temperatures
  • LCD temperature display available in both Fahrenheit and Celsius; with a range of 68 to 93 degrees...
  • Fast heat technology built with a safety shut-off and integrated fish guard to protect fish and...
  • Equipped with a slim profile mounting bracket and colored display alert system

EHEIM Jager TruTemp 300-Watt Approved Fully Submersible Heater

This heater from EHEIM is simplistic and very reliable. It comes with suction cups, making it easy to attach to the side of your betta tank. Within a couple of minutes, you will have it up and ready to make a cozy environment for your fish.

 This incredibly durable heater is made of shatterproof glass. It’s one of the safest heaters available, as the shut-off feature will kick in as soon as it’s low on water. The running dry protection will ensure that your fish stays safe.

 EHEIM Jager TruTemp 300-watt heater comes with a TruTemp dial and readjustment ring that allows you to adjust the water temperature so it’s always precise. No more fussing around or fiddling with an underwater dial that just won’t co-operate.

Many customers have given this heater a 5-star review and claim that it is the only type that will use since they made the switch. They are long-lasting which is why so many customers trust this model. The extra-long cord of 5’6 is very convenient too.   

Eheim Jager TruTemp 300 Watt Fully Submersible UL...
  • TruTemp dial with readjustment ring allows the user to calibrate the heater for a precise temperatur
  • Thermo safety control - enables running dry protection; heater will shut off when out of wate
  • Made of shatter-proof glas
  • Precise temperature regulatio
  • Extra long cable of 5`6

Hygger Submersible Aquarium Heater

This submersible aquarium heater by Hygger is great for betta’s tanks. It is a 300-watt heater that is best suited for tanks that are between 30 and 60 gallons. 

If any faults occur while you’re away you won’t have to worry because of the automatic safety shut-off feature. You can also make sure your betta tank is at the right water temperature because it will stop heating up once it reaches the temperature you have set.

The temperature range is between 75 to 91 degrees Fahrenheit. You can easily set the temperature by adjusting the dial, which allows you to set it at odd numbers within the temperature range. The built-in thermometer will help detect your water temperature.

This waterproof heater needs to be fully submerged when it’s on. It is heat resistant and explosion-proof, making it one of the safest heaters to put in the betta fish’s tank. The reliable and durable design is one of the most trusted heaters out there.

Aqueon Adjustable Pro Aquarium 50-Watt Heater

The Aqueon Adjustable Pro Aquarium 50-watt Heater is the most accurate heater on this list. It is so precise that it can get the correct water temperature within 1 degree. You will never have to guess if your betta fish is in the right temperature. 

The design is shatterproof and nearly indestructible. To guarantee this, they offer a lifetime warranty. Although betta fish aren’t destructive fish, it’s still nice to know that this shatterproof heater will remain safe when getting moved around. 

One of the greatest things about this heater is that once you set the temperature and the water reaches that heat it will automatically shut-off so the water doesn’t overheat. To make it better, the heater will kick back on when the water cools off. 

This slim betta tank heater has a simple, but safe design. It is easy to set up and doesn’t take up a lot of space. The non-corrosive shell provides extra strength and an even heat distribution. 

You will know when this heater has kicked on because the LED power indicator will light up red.  This 50-watt heater is best when used in a 20-gallon tank.

Aqueon Adjustable PRO Aquarium Heater Up to 20...
  • Adjustable heat setting 68 to 88°F, Electronic Thermostat accurate to +/- 1°
  • Shatterproof and nearly indestructible
  • Fully submersible; Auto Shut-Off when over-heats, resets when it cools down
  • LED light is always on: red when heating, green when not heating
  • For fresh and saltwater aquariums

How To Pick Out The Best Betta Fish Heater: Which One Is The Best One?

You don’t have time to shop through every type of tank heater on the market, so we narrowed it down to the top 5. Of course, they can’t all be the best heaters and only one can best take the top spot. When it comes to positive customer experiences, the Fluval E Electronic Heater is the winner.

It is by far the most outstanding fish tank heater you can buy today. Not only do they offer a wider temperature range, but you can also adjust it to temperatures within 0.5 degrees. Many of the other leading heaters don’t allow you to get such a precise temperature.

This heater is also much more sleek and smaller than the other heaters. It isn’t bulky in the fish tank so it looks good without getting in your betta fish’s way. 

Since keeping your fish’s water at the right temperature should be one of your top priorities, this is the best heater because of the color-changing system. It lets you know when the water gets warmer or cooler. This will help you keep your fish comfortable.

Other Things You Should Know About Betta Fish Heaters

The pH Levels

Did you know that betta fish are at their best when they are living in water with pH levels between 6.8 and 7.5? You can make sure your fish have the right pH balance by keeping the water temperature in the right range. This is another reason why you don’t want the water level to drop below 75 degrees Fahrenheit. 

Just Like Home

Your betta fish need a heater to keep the tank’s water warm so it is closer in temperature to the water where these fish originate from. Bettas are native to Malaysia, Indonesia, Thailand, Vietnam, Cambodia, and Laos. All of these are very warm countries. 

The shade in their natural habitat helps to keep the heat in. When in nature, a betta fish thrives in areas that are covered by shrubs and trees. That shade helps to keep a consistent heat for their environment, similar to what the heaters do for the tank.

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Michele Taylor
Michele Taylor

Hello, fellow aquarists! My name is Michele Taylor, and I am a homeschool mother of six children, which includes five boys and one girl. My kids range in age from five-years-old to eighteen-years-old.

Growing up, our family had a large aquarium with angelfish, goldfish, and lots of different varieties of neons. We also had a “suckerfish” that grew to be about six inches long.

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