7 Best 10 Gallon Fish Tank Heater Ideas

This article is about finding the best heaters for a 10-gallon tank. We’ll help you find the right one for you and share a few tips and tricks when looking for an aquarium heater.

We decided to take a closer look at some of the best heaters for a 10 gallon tank available to find the best models out there. Of the many models we’ve seen, these are the best 10 gallon fish tank heaters to buy in 2021:

  1. Best Overall: Fluval M50 Submersible Glass Aquarium Heater
  2. Most Reliable: Eheim Jager Aquarium Heater
  3. Best Submersible: Aqueon Aquarium Heater

Just like you, I care about fish and as experts, we know that fish depend on proper water temperature for thermoregulation and seek out proper temperatures that optimize their well-being.

Some fish even seek out warmer water when they are fighting an illness, like parasites. This is known as “behavioral fever” and has been documented in fish and reptiles.

So water temperature is vital to keeping your fish healthy.

Pro-Tip: When adding a new heater to your tank be sure to keep an eye on the tank temperature for the first few days to ensure it is functioning properly.

Given that a water heater is an essential piece of equipment for your tank, we have spent some long hours looking into a few heaters for you.

Out of the list of the seven best heaters for a 10-gallon tank, I recommend the Fluval M Submersible Aquarium Heater as our top pick, it is safe, versatile, budget-friendly, and does the job. You can see it in my 10-gallon planted tank.

But the other six in the list for the seven best heaters for a 10-gallon tank don’t disappoint either.

Further Reading: Learn How To Use An Aquarium Heater Properly (Everything You Need To Know About Setting Up, Installing & Regulating Your Aquarium Heater)

Our Picks For A 10 Gallon Fish Tank Heater

The 7 Best Heaters for a 10 Gallon Tank

So, here is our in-depth research on the seven best heaters for a 10-gallon tank. These products have been handpicked and reviewed so that it will help you choose the right heater.

  1. Tetra HT Submersible Aquarium Heater:

Coming in at #7 is the Tetra HT submersible aquarium heater. It is a safe and easy to use heater. The heater helps to provide the right temperature for most tropical fish by maintaining the water at 78°F. This is possible because it has a built-in thermostat for automatic maintenance of temperature.

If you have an aquarium that has a capacity of two to 10 gallons, this model is ideal. If you have an aquarium that has a larger capacity, you can include more than one heater to keep your fish comfortable.


  • It has an indicator light to show that the heater is on. This eliminates the need for taking the heater out of the water to know whether it is working or not.
  • The built-in thermostat maintains the water temperature at a proper 78°F.
  • The HT heater can be placed in any position, and it is small enough, which makes it easy for you to conceal.


  • A rarely reported malfunction, which can happen to any heater, is the possibility to overheat. Always check your water regularly.

Pro-Tip: If you are going to choose this heater, consider buying two at the 50W setting. Since they auto-regulate, having two acts as a failsafe should one fail. If one gets hot, the other will not turn on, and being only 50W, it will not overheat the tank. Because at some point, all heaters fail. Always monitor your tank.

  1. Orlushy Submersible Aquarium Heater:

Orlushy Mini Aquarium Heater 100W,Small Fish Tank Heaters with LED Digital Temperature Display and External Temperature Controller for Betta Frogs Newts Turtles(100W)

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Another one of Amazon’s favorites, this model is available in 100W, 150W, 200W, and 300W, and you can choose any one of them depending on the capacity of your aquarium.

The 100W is what we recommend for a conventional 10-gallon tank. But for others, the 150W heater is suitable for 15 to 30 gallons. The heater has an outer shell of 2mm thick quartz glass and is completely shatterproof.

The Orlushy aquarium heater can be used in both freshwater as well as saltwater. You can select precise temperature maintenance anywhere between 68°F to 89°F. The aquarium also has a built-in thermostat that turns off the heater once the desired temperature has been achieved.


  • It has a reliable built-in thermostat that has an automatic shut down.
  • A separate corded thermometer that hangs on the outside of the tank to a suction cup.
  • The heater is also shatterproof and can be used in both freshwater and saltwater.


  • Takes some time to heat the water.
  • It is reported that the dial is a bit tough to turn with one hand.
  1. Freesea Submersible Aquarium Heater:

Rated as Amazon’s Choice for Betta Fish, this submersible water heater has an excellent, broad temperature range. It can warm up your aquariums between the temperatures 59°F and 94°F. It can also display temperature in Celsius with a touch button and includes cyclic adjustment temperature.

The built-in thermostat cuts off the power once the water reaches the required temperature and also turns it back on once the water goes below its desired temperature. This model is available in 50W, 75W, and 100W, where they are suitable for a 1 to 10-gallon tank, a 5 to 15-gallon tank, and a 10 to 20-gallon tank, respectively. This heater was designed with aquarium hobbyists in mind because you can change the temperature without having to get your hands wet.


  • The cyclic adjustment temperature helps keep your aquarium healthy and clean.
  • The automatic turn off and turn on feature makes sure that your aquatic pets and plants get all the needed comforts.
  • It is compact and would fit in any shape, landscape, or portrait, aquarium design.
  • Rounded shape if you don’t want the cigar shape of most heaters.


  • The cord is not very long, around four feet, so you might need an extension cord depending on your tank location.
  • Tiny fish have been reported to get stuck in the slots of this heater leading to death.
  1. HITOP Aquarium Water Heater:

This heater has better scores than the others mentioned so far. With this heater, you can set your temperatures anywhere from 61°F to 90°F. But what’s great about this heater is the fact that it comes with an extra thermometer, just in case you needed a second opinion on the temperature of the water.

The exterior of this model is also made from a 2mm thick quartz glass and is 100% explosion-proof. It has a ten multi-slot heating ceramic frame, which creates better heat dissipation.

The manual on/off switch, in our opinion, is a plus. It keeps owners from relying too much on automatic sensor controls, which can be faulty.


  • The add-on thermometer makes sure that your water is at the right temperature.
  • The heater is also explosion-proof because of the 2mm quartz glass.
  • It also comes with an extra suction cup.


  • There is no automatic switch off. So, you will have to make sure that you turn the heater off after it reaches the desired temperature.
  • It has been reported to arrive in a bubble-wrapped envelope. Make sure to check for damage upon arrival.
  1. Aqueon Aquarium Heater:

Coming in at #3 is the Aqueon water heater. This unit provides precise water temperature, which can be anywhere between 68°F to 88°F.

This is also one of the safest models to use for beginners because of automation. You should still keep an eye on the temperature.

It has an automatic shut-down feature for when the water reaches its desired temperature and an automatic turn-on feature when the water is below its required temperature. It also has an indicator light to show that the heater is on. The heater is also shatterproof as it is made of quartz glass and is also fully submersible.


  • It is equipped with shatter-resistant technology.
  • It has an automatic shut down and turn-on feature.
  • The power indicator turns on to show that the heater is on.


  • Some units heat water unevenly. It seems to heat best when placed horizontally.
  • Reportedly does not work well above 10-gallon tanks.
  1. Eheim Jager Aquarium Heater: 

EHEIM Jager Aquarium Thermostat Heater 100W

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This state-of-the-art heater is excellent for your aquarium as it has the TruTemp feature, which recalibrates the temperature of the aquarium to its desired temperature. The Eheim Jager aquarium heater will turn itself off if the water dips lower than the set limit. It will also turn it back on once the water level rises to its required temperature set point.

The heater is suitable for both saltwater and freshwater and is both shockproof as well as shatter-resistant. The power indicator light is perfect for monitoring the heater from outside the aquarium. There are eight optional sizes of watts available from 25 – 300W.


  • TruTemp temperature is an excellent way of ensuring that your aquarium remains at its desired temperature without needing to turn it on or off repeatedly.
  • It is suitable for both marine and freshwater aquariums.
  • It is a safe instrument as it is shatter-resistant as well as shockproof.


  • Some reviews are claiming that Eheim customer service isn’t the high quality it used to be in the 40 years they’ve been in business.
  1. Fluval M Submersible Water Heater: *Our Top Pick*

Fluval M50 Submersible Glass Aquarium Heater (50 watts)

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Fluval entered the aquatic scene in 1975 by pioneering the world’s first 3-stage filter with synchronous motor technology – a game-changer that is still applied in the industry today. Fluval M has been in the aquarium business for a long time, so they know exactly what the customer wants. This is a stylish model, where one of its most defining features would be the camouflaging feature. It includes mirrors that can mimic the surroundings of the heater to conceal it.

The water heater also has a high-density ceramic that has shock-resistant borosilicate glass as its exterior covering. It is a water heater that stands for reliability and safety.


  • The reflective technology makes sure that the heater stays hidden as it can mirror the surroundings of the aquarium.
  • The temperature is so simple to control with the provided temperature dial.
  • It has a calibrated thermostat to recalibrate the temperature of the water automatically.


  • It is quite long for small-sized aquariums.
  • Only good up to 15 gallons.
  • Glass exterior means if you drop it, it can break. Shock-resistant does not mean unbreakable if dropped.

Here is a video review of the Fluval M50 Heater.

10 Gallon Heater FAQs

Features to consider:

With so many products out there, it can be challenging to choose the right one for your aquarium. However, this section will guide you on what features to look for while you are out looking for the best aquarium heater for your 10-gallon aquarium.

It’s also important you understand if you Can You Fully Submerge a Fish Tank Heater which depends on the type of heater you ultimately purchase.

What is the best heater wattage for your aquarium?

You may find the perfect looking model for your aquarium, but the wrong wattage can kill your fish. The rule of thumb is to consider at least 2.5W to 5W per gallon. So, for a 10-gallon aquarium tank, you would require at least 25W to 75W of wattage. For a higher volume, do the math.

What is the best type of aquarium heater?

There are several types of aquarium heaters:

  • Submersible: These heaters are entirely submersible in the tanks, and they are usually shockproof and shatter-resistant. They are also waterproof, obviously. Submersible water heaters work best for smaller aquariums that have a capacity of 1 to 20 gallons.
  • Hang-on tank: they are mounted on top of the aquarium, and they are suitable for larger aquariums. They are also partially submersible and are also great for small-sized to medium-sized aquarium tanks. For larger tanks, it is best to get two hand-on heaters and place them at the sides.
  • Heating cable: The heating cable needs to be placed underneath the substrate or gravel, and they are suitable only for freshwater aquariums.

What is the right aquarium water temperature?

The water temperature depends on the type of fish you have in your tank. But the typical temperatures for most aquariums range from 76F to 86F. Some fish may require warmer temperatures, and some fish may require temperature change during the change of seasons. So, it is essential to follow-up on the behavior and characteristics of the fish once you decide to get an aquarium.

Final Thoughts

Getting an aquarium is not the same as getting any other pet. Of course, you have to feed the fish their food regularly. Still, an aquarium is a mini eco-system, and it is a huge responsibility and goes beyond just feeding and cleaning their waste products. The right heater is also essential as aquatic life is different from terrestrial life.

Out of the list of the seven best heaters for a 10-gallon tank, the best choice is the Fluval M Submersible Aquarium Heater, as it is safe, versatile, budget-friendly, and does the job of keeping your fishes alive. But the other six in the list for the seven best heaters for a 10-gallon tank don’t disappoint either.

We hope this guide will help you in finding a suitable tank heater for your little buddies.

Remember: always watch the tank and your fish’s behaviors. Frequently, they will signal a problem with the way they behave. If you have any questions that we have left unanswered, feel free to send me a message.

More Info About 10-Gallon Tanks

  1. Guide to Setting up Your 10-Gallon Planted Tank
  2. 12 Hungry Algae Eaters For Small Tanks 10 Gallons & Under
  3. Stocking A 10 Gallon Tank
  4. Best Small Catfish for a 10-Gallon Tank Setup
  5. Bottom Feeder Fish for a 10-Gallon Tank
  6. How Much Gravel For A 10 Gallon Tank
  7. How Many Neon Tetras In A 10 Gallon Tank
  8. How Many Guppies in a 10-Gallon Tank
  9. How Many Goldfish in a 10-Gallon Tank
  10. Easy 10-gallon Cichlid Tank Ideas
  11. Best Powerhead for a 10 Gallon Tank
  12. Best Heater for a 10-gallon tank
  13. What Is The Best Canister Filter For A 10 Gallon Fish Tank?
  14. Gravel Vacuum For 10 Gallon Tank & Smaller
  15. Best Stands For 10 Gallon Fish Tanks

Heaters For A 10 Gallon Fish Tank


Mohammed, R. S., Reynolds, M., James, J., Williams, C., Mohammed, A., Ramsubhag, A., … & Cable, J. (2016). Getting into hot water: sick guppies frequent warmer thermal conditions. Oecologia, 181(3), 911-917.

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