The Aquarium Guide

The Complete Guide to Selecting Best Betta Fish Heater

Red Betta Fish on a black background

Whether you’ve seen them in somebody’s living room or in the fish tank in your dentist’s waiting room, betta fish are well known for their bright, vibrant colors and their tales which resemble flared ball gowns.

While betta fish can survive in most environments, there are certain measures you can take to prolong their life. Selecting the right sized tank with a proper heating and filtering system is essential.

Note: The average lifespan of a betta is around 3 years, but with proper care, your fish may stay alive for around 4 years or more!

The Ideal Temperature for a Betta Fish Tank

Betta fish thrive in warm water and tropical climate. The temperature in your house constantly fluctuates based on the local climate and due to artificial heating and cooling systems you may have installed.

Bettas thrive in water which is between 78-80 degrees. They can still survive if the temperature is a few degrees above or below this, but their lifespan will be considerably shorter. Even within this range, it is vital to keep the temperature relatively constant because frequent fluctuations will stress out the betta.

Getting a tank heater for you betta fish will keep the water temperature constant, but it is important to get the right heater. Some heaters look amazing in their advertisements but are unable to regulate the water temperature in reality. Others are too expensive and not worth it, especially if you have single betta fish.

So how exactly do you choose the best betta fish heater for your tank?

Preview
Best for Small Tanks
Fluval Marina Submersible Heater for Aquarium, Mini, 50-watt
Best Nano Tank Heater
Marina Betta Submersible Heater for Aquarium
Best for Large Tanks
EHEIM NORTH AMERICA - JAGER HEATER 150W (13"") "Ctg: AQUATIC PRODUCTS - AQUATICS - TANK HEATERS"
Best All-round Tank Heater
Hygger Submersible Aquarium Heater, Adjustable Fish Tank Heater Compact Reliable Betta Heater, Heat-Resistant Milky Quartz Made, with External Temp Controller, 50W/100W/300W, 7-60 Gallon (300W)
Product
Fluval Marina Mini Heater
Marina Mini Betta Submersible Heater
EHEIM Jager Heater
Hygger Submersible Aquarium Heater
Wattage Range
25w - 50w
8w
25w - 300w
50w - 300w
Temperature Range
76º - 91º F
~78º
65º - 93º F
76º - 91º F
Tank Size Range
5 - 10 Gallons
Up to 1.5 Gallons
10 - 100 Gallons
7 - 60 Gallons
Prime Eligible
Best for Small Tanks
Preview
Fluval Marina Submersible Heater for Aquarium, Mini, 50-watt
Product
Fluval Marina Mini Heater
Wattage Range
25w - 50w
Temperature Range
76º - 91º F
Tank Size Range
5 - 10 Gallons
Prime Eligible
More Information
Best Nano Tank Heater
Preview
Marina Betta Submersible Heater for Aquarium
Product
Marina Mini Betta Submersible Heater
Wattage Range
8w
Temperature Range
~78º
Tank Size Range
Up to 1.5 Gallons
Prime Eligible
More Information
Best for Large Tanks
Preview
EHEIM NORTH AMERICA - JAGER HEATER 150W (13"") "Ctg: AQUATIC PRODUCTS - AQUATICS - TANK HEATERS"
Product
EHEIM Jager Heater
Wattage Range
25w - 300w
Temperature Range
65º - 93º F
Tank Size Range
10 - 100 Gallons
Prime Eligible
More Information
Best All-round Tank Heater
Preview
Hygger Submersible Aquarium Heater, Adjustable Fish Tank Heater Compact Reliable Betta Heater, Heat-Resistant Milky Quartz Made, with External Temp Controller, 50W/100W/300W, 7-60 Gallon (300W)
Product
Hygger Submersible Aquarium Heater
Wattage Range
50w - 300w
Temperature Range
76º - 91º F
Tank Size Range
7 - 60 Gallons
Prime Eligible
More Information

What to Look for in a Betta Water Tank

Here are all the factors you need to look at when getting a betta tank.

The Right Power Based on the Tank Size

The Wattage of your tank should be sufficient to heat the entire tank consistently. Ideally, the tank heater should provide around 4 watts per gallon of water.

If your tank is very large, it’s a good idea to attach to small heaters for even heating. For instance, with a 10-gallon heater, you can attach two 20 watt heaters at opposite ends of the tank.

Adjustability

Tank heaters may fall one of the following two categories:

  1. There is a fixed temperature which can never be changed
  2. The temperature is variable and can be adjusted

Normally, the lower cost tanks are likely to have a preset temperature. This can be inconvenient if you want to adjust the tank temperature to account for changes in the weather.

Ease of Use

Here, you need to consider how easy it is to understand the temperature scale and the overall functioning of the tank heater.

Reading the Temperature

Being able to read the temperature scale of your tank is necessary if you want to make adjustments. If you want to keep your tank at a specific temperature, you need to be able to read the scale easily.

It is important to note that the temperature scale of the tank may not be a hundred percent accurate. For greater accuracy, you can get a thermometer for your tank to double-check the temperature of the water.

Overall Use of the Betta Tank Heater

Keep in mind that the tank heater will be completely submerged in the water so the design should be such that you can use it easily even then. Heaters with large knobs are ideal.

Most heaters will have either suction cups to attach them to the tank wall or a hanging mechanism to submerge them in the water.

Safety First

Make sure that you read the fine print to ensure that the heater is safe enough to be completely submerged in the water. If it’s not and you didn’t check in advance, you are at risk of getting electrocuted when handling the heater in the tank.

The heater should have a fail-safe mechanism which makes it turn off if the water level is below the heater.

The better the quality of the tank heater, the more resistant it will be to damage. Choose wisely so that your heater is strong enough to withstand a few falls or electric currents.

The heater should be insulated or have a protective coating of some sort to prevent your fish from getting hurt if they accidentally bump into the heater. The whole point of the heater is to give your fish a better space to live, not to kill them.

Top Picks for Betta Fish Tank Heaters 

Here is a list of the best tank heaters for bettas.

Best Betta Fish Heater for Small Tanks – Fluval Marina Mini

Why it’s Great 

What You Need to Look Out For

Make sure that the tank you buy is completely sealed and get it exchanged if the seal is broken from before.

Best Betta Fish Heater for Nano Tanks – Marina Mini Betta Heater

This one is suitable if you have a mini tank with a single betta fish.

Why it’s Great

Even if the outside temperature changes, the heater will regulate the water temperature on its own.

What You Need to Look Out For

Overall, this heater is fine for a tank of around 1.5 to 2 gallons. Anything smaller and it is likely to overheat the water and affect your betta’s health.

Best Betta Fish Heater for Large Tanks – EHEIM Jager Aquarium Thermostat Heater

The EHEIM offers a number of variants suitable for different sized tanks.

Why it’s Great

What You Need to Look Out For

If you do end up getting an EHEIM heater, it is ideal to keep an eye on the water temperature and maybe use a thermometer as well just as a precaution to avoid overheating.

Best Betta Fish Multipurpose Heater – Hygger Submersible Fish Tank Heater

This one is similar to the EHEIM Jager in the sense that it offers many variants that are suitable for different sized tanks.

Why it’s Great

What You Need to Look Out For

As with most heaters, this one runs the risk of overheating and killing your fish. The fact that it doesn’t have an automatic shutting off system or an emergency light means that you can’t just turn it on and leave it. You have to keep an eye on it to avoid any disasters.

Only the Best for Your Betta Fish

Bluish purple betta fish

These small, vibrant fish can make your home or office look inviting and comforting. Bettas will keep you company for a few years if you take care of them properly, so it’s okay to splurge on a good quality water heater to keep them happy.

We’ve covered a wide range of betta tank heaters for tanks of all sizes so you have plenty of options to choose from. Make sure to choose the best betta fish heater for your particular situation.

One thought on “The Complete Guide to Selecting Best Betta Fish Heater

  1. I really liked this post on heaters. My 10 gallon Aqueon usually registers 2 slightly different temps at opposite ends 79-79.6 degrees. I have a submerged heater that came with the tank set up as a package. “Blue” my betta & “Finn” my Mystery snail seem to be doing ok w/it at this temp. but I always am looking for one that will keep the WHOLE tank the exact same temp. at both ends. Thanks for the infol

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