8 Best Aquarium Heaters to Ensure Your Fish Thrive

It doesn’t matter whether you plan on keeping freshwater fish or tropical fish in your aquarium, the temperature of the water in the tank is one of the utmost importance you need to be thinking about. After all, remember how it feels when you’re too cold; and now imagine what it must be like to feel like that as a little fish.

In the cases where you don’t consider the temperature of the aquarium water, this can lead to so many problems including stress and health-related issues, fatalities, and all other aspects of your tank will be affected, including your plant life. However, while this is such an important point to think about, the solution is simple. Invest in an aquarium heater.

By buying and installing a heater, you can effortlessly regulate the temperature of the water in your tank and completely avoid any of the temperature-related issues we’ve listed above.

Whether you’re buying a heater for the first time, or you simply looking for a great heater to replace or upgrade your existing one, we’re here to help. We’ve searched across the market at what’s out there and narrowed down the best to just the best of the best.

Fluval E 100-Watt Electronic Heater

Fluval E 100-Watt Electronic Heater

Starting off our list, we’ve chosen the Fluval Electronic Heater, easily one of the most popular aquarium heaters available on today’s market, and for a good reason. This particular line balances quality, performance, and price, making it an all-around great heater for any tank or basic temperature control purposes.

While this particular model is 100-watt, if you’re looking for more power, there are both 200 and 300-watt versions available. However, what we really love about this heater is the built-in color-coded LED display. This shows the temperature in both Celsius and Fahrenheit and comes with a leading range of 68-93°F.

What’s more, you can trust this heater is accurate thanks to the dual sensor technology which always provides you with the real-time temperature at a glance. Furthermore, in the case that you’re changing the water, there’s even a quick heat function with an auto safety shut-off feature to ensure the water is always perfect.

Despite having all these features, the Fluval heater is incredibly easy to use and built to protect your fish from burning themselves thanks to the simple casing. In short, there’s really nothing bad to say about this heater that guarantees to get the job done!

  • Comes with a premium 5-year warranty
  • Color-coded LED screen to show if the temperature is suitable
  • Fast-Heat feature with auto safety shut-off
  • Protective casing to stop aquarium life from becoming burnt
  • Temperature can fluctuate a couple of degrees

Tetra HT Submersible Aquarium Heater with Electronic Thermostat

Tetra HT Submersible Aquarium Heater with Electronic Thermostat

If you’re looking for a super-affordable option for an aquarium heater, but you still want access to a quality product that’s built to last, the Tetra heater, another household name in the world of fish tanks, could be the perfect option for you.

This heater is designed with smaller tanks in mind, usually around the 35-gallon or less mark. There are both 50-watt and 100-watt versions available, allowing you to choose the one that’s right for you. Both come with all the features you’ll need to heat your tank accurately.

Most importantly, there’s an electric thermostat built right into the heater, so you won’t have to worry about buying it separately, and for the most part, this heater can be automated to stay on a certain temperature range.

There’s also an indicator available, so you can check whether the heater’s on, which is indicated using a red light, and green when the water is at the desired temperature. What’s more, this heater can be fully submerged into your tank without the worry of water damage.

In short, this is one of the most popular fish tank heaters out there. The heater has a long lifespan, has a ton of features to use that can give you a great experience, and for such an affordable price tag, what more could you ask for?

  • Available in 50 and 100-watt varieties
  • Heating operational indicator light (red/green)
  • One of the most affordable aquarium heaters available
  • Completely waterproof design
  • Doesn’t last as long as other heaters on the market

Aqueon Pro Adjustable Heater (250-Watt)

Aqueon Pro Adjustable Heater (250-Watt)

The final aquarium heater we’ve chosen to list here today comes from Aquaeon. If you’ve been in the aquarium world for some time, there’s no chance you won’t have heard of this game-changing brand. Renowned for their quality products, this pro heater is everything you’ll need.

Firstly, while this is the 250-watt version, there are plenty of options available ranging from 50-watts to 250-watts, which is ideal for all aquariums around the 35-gallon mark and under. Built into each heater, you’ll be able to adjust the overall water temperature anywhere between 68°F and 88°F.

Perhaps the best feature that everybody loves this heater for, however, is the fact that it’s basically indestructible. The heater itself is designed and crafted using shatterproof glass, and it’s completely submersible, so you can put it below the water line without fear of it breaking.

With a limited lifetime warranty to back this up, this could even be the last aquarium heater you ever need to buy!

  • Comes with a limited lifetime warranty
  • Perfect for all aquariums under 35-gallons
  • Adjustable temperature readings and settings
  • Virtually destructible design
  • A bit more expensive than other heaters on this list

Anvava Aquarium Heater Stainless Steel Submersible Fish Tank Heater with Thermostat

Anvava Aquarium Heater Stainless Steel Submersible Fish Tank Heater with Thermostat

Next up, we’ve chosen another fantastic heater, this time from Anvava. In terms of affordability, it doesn’t get much better than this; yet it still retains the quality and performance rating you would expect from a much more expensive heater.

This completely submersible heater can be dropped into your tank, and since it’s made from stainless steel, it’s protected against corrosion and ensures it’s anti-scold to stop you or your fish from burning yourself through touching it.

The temperature is also easily adjusted using the top section and provides you with a brilliant range of 64-93°F. The only real downside to this heater is that you will need to charge it, but you’re more than welcome to leave it plugged in; a red light will show when it’s charging.

This particular model even comes with built-in suction cups, so you can effortlessly attach it to a tank of any size,
although it is recommended your tank is around 45-75 gallons. Since the heater also comes with a built-in thermostat, you can ensure the temperature is kept regularly, although there’s so no screen so you can’t see for yourself. All in all, this heater is really well made, highly durable in all kinds of water, protects your fish and gets the job done.

  • Two suctions cups built onto the device for easy installation
  • Heats your water quickly and efficiently
  • A super affordable heater solution
  • Quality build that’s protected from water damage and corrosion
  • Doesn’t come with a screen to display temperature

Eheim Jager Aquarium Thermostat Heater

Eheim Jager Aquarium Thermostat Heater

Whether you own a single tank that you want a heater for, or you own multiple tanks of different sizes, sometimes you need a selection of heaters, so you can find the perfect one for you. With these awesome and affordable heaters, you’ll be able to choose from any wattage ranging from 25-watts, all the way up to 300-watts, ensuring you’ll be able to find the perfect one that fits your tank. But don’t worry, while there’s a lot of choices here, there’s no compromise on functionality.

This heater is fully submersible, allowing it to heat your water thoroughly and quickly, and has a range of built-in features such as the heater turning off automatically when the water level is too low, perfect for if you’re cleaning, or taking the heater out for any reason, and a numbered dial for easily setting an accurate temperature.

What’s more, this heater is highly accurate thanks to the built-in thermostat and integrated TruTemp dial that helps to keep the temperature balanced and consistent; although there’s no screen for displaying the exact reading.

This is easily one of the best aquarium heaters out there. It’s very easy to use, and you’ll be familiar with it in just a matter of minutes. While this is a bit more expensive than your typical heater, the functionality of it is completely worth it.

  • Made from anti-shatter glass for a highly durable build
  • TruTemp technology for accurate temperature setting
  • Built-in thermostat for monitoring the water temperature
  • Automatically shuts off when it detects a lack of water
  • A more expensive option than your typical heater

Hygger Submersible Aquarium Fish Tank Heater

Hygger Submersible Aquarium Fish Tank Heater

Hygger is another awesome brand that produces a high-quality line of aquarium products, including powerful and durable heaters that are renowned for their performance and reliability. This fully-submersible version is no exception to the rule.

As the title suggests, you can fully position this heater into your aquarium, ensuring you’re able to get the best position that’s right for you. Even once submerged, there’s a built-in thermometer, complete with an auto-shutoff feature to stop your water from overheating, and a dial on the power lead so you can easily set the temperature to whatever you want it to be.

This amount of temperature control ranges from around 68°F to 93°F, which is more than enough for any kind of fish in your tank. Of course, being a premium quality heater, this one comes with a clear LED display that helps you see what accurate temperature, adjust the settings, and indicates when the heater is on and working.

Installation is also effortless thanks to the two included suction cups, and there’s even an added plastic heater guard that stops your fish going up to the heater and hurting themselves.

With a great customer support team, a high-quality heater and all for a good price, this is one aquarium heater where you can’t really go wrong!

  • A great customer service team
  • A fantastic range of temperatures
  • Internal thermometer with auto-shutoff feature
  • Clear LED display for seeing all information
  • None!

Soyon Aquarium Fish Tank Heater

Soyon Aquarium Fish Tank Heater

This next aquarium heater from Soyon is another super affordable solution, but this ideal for larger tanks and for those who are looking for something extra. Measuring in at 300-watts, this heater is capable of supporting and heating any sized aquarium all the way up to 80 gallons.

What’s more, it’s capable of supporting the standard temperature ranges of 68°F through to 94°F. It’s also extremely easy to use. Once you’ve set your desired temperature, the heater will automatically test the water with the built-in thermostat and then set the temperature on its own. The entire process is fully automated.

What’s more, while this is a cheaper option, it still comes with a 12-month warranty and is made from 2mm Thick Quartz glass which is renowned for its shatterproof properties, even at high temperatures.

We really love this heater, and everything about it is just excellent. It doesn’t matter what your fish tank is made of or what temperature you’re trying to achieve; this heater will perform above and beyond the call of duty every time.

  • Produced from Thick Quartz shatterproof glass
  • Comes with a 12-month warranty
  • Built-in thermostat for monitoring the internal temperature of your aquarium
  • None!

Cobalt Aquatics Neo-Therm Aquarium Heater

Cobalt Aquatics Neo-Therm Aquarium Heater

The final aquarium we’ve chosen for our ‘best of’ list is a true high-performance piece of equipment. If you’re in need of a highly functional heater that goes the extra mile and provides you with the best experience, there will be no reason to look further than this range.

The Cobalt Aquatics leading feature is the awesome LED light circle that displays the current temperature of your tank’s water. This display is super easy to use (yellow means the water is too cold, green is just right, and red is too hot), and each integer is labeled in Fahrenheit for a precise reading at a glance.

You can then use the dial at the top to select which temperature you want in the simplest way possible. The body of the heater is made from shatterproof materials, which is then complemented by a 3-year warranty, giving you complete peace of mind that this is a heater that’s built to last.

If you’re on the hunt for the best heating experience, it doesn’t get much better than this. The heater works perfectly every time and remains consistent while you’re using it. There are no fluctuating temperatures here; a common problem with some of the cheaper aquarium heaters.

With instructions on how to use and set it up, suction cups for attaching it to your tank, and all the features you’d expect in a premium quality aquarium heater, there’s no reason you’d need to hesitate with this fantastic heater.

  • Crafted from shatterproof materials
  • Comes with a 3-year warranty
  • An incredibly helpful LED color-coded temperature display
  • Comes with integrated suction cups for easy installation
  • None!


As you can see, when it comes to choosing the right heater for your aquarium, there are plenty of different options out there to suit what functionality you’re looking for and your desired price tag. Any of the eight heaters we’ve listed above make perfect choices, and you’ll be well on your way to owning the aquarium you’ve been dreaming of.

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