10 Best Heater for 5 Gallon Betta Tanks (2021 Reviews & Guide)

A large number of fish species require warm water to survive so if your fish tank water is too cool, you will probably need an aquarium heater. There are five main types of aquarium heater; submersible, immersible, substrate, in-line and filter. This guide presents to you 10 of the most loved aquarium heaters you can find on the market. It also guides you on how to choose the Best Heater for 5 Gallon Betta Tank, explaining to you in detail all that you need to clinch the right heater for your tank. Check it out to learn how to make a sounder decision.

What exactly is a heater for fish tanks?

Aquarium heaters are appliances used to warm aquariums and keep the water temperature within the required level at all times for the sake of the aquatic animals. It is used to create a conducive environment for Flora and fauna to live in. It does so by warming the water in the tank to the most appropriate temperature considering the typical amount of temperature needed by the aquatic animal in the tank to survive. To get the water in your aquarium to the right temperature for betta fish, for instance, you need the best betta tank heater.

Do betta like the heaters?

It depends. Some heaters are better than others in several ways. Betta needs these heaters to help create a conducive environment for them. However, when the heater is too large or has rough edges, it may make the fish uneasy or even injure it. You should choose a heater that will not malfunction and possibly electrocute your fish. Also, the smaller the heater the less distracting to the fish it will be. Some heaters can be hidden among the contents of the tank to make it fit in. That way, it will not lie on the fish path and cause discomfort to them.

You are about to find out which betta tank heaters for 5-gallon tanks rule the market. These are 10 of the best of these gadgets and they have so much to benefits from as an aquarist. Each is unique in some way, and it takes a lot of keenness to choose what best suits your needs.

One of the things that make this SZELAM aquarium heater stand out is its intelligent circuit board. The board helps in integrating the temperature sensing board with a constant heating system. It means you do not need a thermometer to know the water temperature. This heater is also easy to use and way better than a manually adjustable heater.

What I like

This heater is energy efficient. You will be impressed with how much it saves energy without interrupting the optimal performance. It functions in intermittent operation mode with the ability to turn on/off automatically. You can use it straight out of the box, thanks to its general ease-of-use. With an automatic temperature regulation of between 73-degrees Fahrenheit to 82 degrees Fahrenheit, this heater does not need to be set. That way, it gives you an easier time. It is ideal for small tanks and amazingly takes up little space.

What I don’t like

It has a limited temperature range which I believe is unacceptable. For a heater of its class, it should have offered a wider temperature range. Also, durability is limited. You could expect more from such a quality-looking heater.

  • It is energy efficient
  • Safe for the user and the fish
  • It takes up little space
  • Automation allows you to set it and leave it
  • Easy to use in every sense of it
  • Does not lasts as long as you would expect it to.

It allows you to get exactly what you need. The heat setting ranges from 68 to 88 degrees Fahrenheit. Betta typically prefers a water temperature of about 78 degrees Fahrenheit which is right in between what this heater offer.

What I like

This heater is shatterproof and very durable. It can survive falls and never lose its effectiveness over years of constant use. Also, this heater never disappoints with a betta. It gives the fish the environment it needs to thrive and live happily. And since it is also dully submersible, this heater does a great job of warming your tank.

What I don’t like

Despite the lots of impressive characteristics that this heater boasts of, it still has things that taint its rather great reputation. For instance, the suction cups do not stick easily to the side of the aquarium at first but later on, they behave. Also, it takes a while to heat the tank to the desired temperature.

  • Fully submersible
  • Warms the aquarium better
  • Shows when the tank reaches the optimal temperature
  • Automatically detects the water temperature
  • Shuts off automatically when the temperature is right
  • The function cups do not attach to the walls of the tank at first

With its super flat design, this heater fits in many tanks very well and takes up a small space. It is fully submersible and has been created to save energy while still giving the best heating performance to your tank. You can use it in aquariums and terrariums and it still heats one just as well as the other.

What I like

There will not be any need to replace it with another sooner. The company also stands out as very helpful whenever you have a problem with your new gadget. They respond faster to their customers’ problems and that makes their products even more valuable. This heater also provides ultimate safety and durability.

What I don’t like

It is pricey. If you are on a budget, you may not make it buy this amazing heater. Also, I have realized that you can only adjust the heater by an increment of 2 degrees Fahrenheit. That is a difference that can be too much for some fish other than Betta. It should have had an increment of 1-degrees Fahrenheit like in a normal case.

  • Super-flat design is convenient
  • Accurate one-touch system
  • Virtually indestructible
  • Safe and reliable
  • Long life
  • Heater is pricy

This is one of many aquarists’ favorite heaters. It is an advanced version of most of many of its competitions. You would be comfortable all the way knowing well that this heater is doing a lot of good to your tank and the aquatic life in it.

What I like

The fact that it is fully submersible makes it in a position to deliver optimal performance. I also love its thermos safety control features because it protects against running dry, which is very important. It shows some light that indicates whether it is heating the tank or not. It makes monitoring the tank so easier. Amazingly still, you can set the temperature in about 0.4 degrees Fahrenheit intervals, which is way better than most. This makes it sui5table for various types of aquatic animals.

What I don’t like

The fact that it is so colorful may be a good thing but when you consider that it draws attention from the elegance of your tank and the beauty of your betta fish, it becomes a disadvantage. The different colors make you want to look at it more. Which may be a problem for some.

  • On/off indicator light
  • Shatterproof design
  • Made of shock-resistant glass
  • The temperature setting is accurate
  • Provide precise temperature regulation
  • May not fit in smaller tanks because it is tall

Technology seems to have taken a new toll on this one. Featuring some very unique characteristics, this heater is more promising than you can imagine. It provides a more modern way to keep your aquarium at the right temperature for your fish to survive or just thrive. Besides its cool features, you will love the look of it. Most aquarium owners would love it or just acknowledge its good value.

What I like

It is little and very convenient since it has an automatic temperature function that frees you from some stress. Due to this function, it maintains a constant temperature and only turns on when the temperature falls below the set point. What it requires from you is as simple as plugging it I, setting the temperature and placing it in the water.

What I don’t like

It is not the most durable heater you would want for your tank. Since it has limited durability, many users would drop it for just that. The cord is also not long enough for some functions.  Apart from these downfalls, everything else about this heater is worth applauding it for.

  • Temperature is adjustable from outside the tank
  • Very accurate
  • Takes little space inside the tank
  • Keeps the tank at a consistent temperature
  • Provides a wide range of temperature
  • Limited durability

From the shape, size to the indicator light, this heater can serve as a great addition for your aquarium. It is a nice option for small and medium-sized aquariums. You will have an easy time knowing whether it is on or off and to determine how the heating is progressing. What makes this heater even cooler is the fact that it can be placed both vertically and horizontally in the tank. So you choose whichever position is convenient.

What I like

It is easy to install and will not make you sweat doing it. It has a suction cup that attaches steadfastly to the aquarium wall. I tend to see its lack of many features as an advantage too. It has a basic design that makes it simple.

What I don’t like

It does not have temperature settings, and that can be a great inconvenience for many aquarists. You will also be disappointed by the fact that it comes with just one suction cup. This makes make things a little difficult for you since it is hard to keep stuck in one place.

  • It is reasonably priced
  • Small and discrete
  • Easily concealable
  • No adjustment required
  • Can be placed vertically or horizontally
  • Has just one temperature

This is a 24-watt heater that would be great for your aquarium if it falls within this capacity. It sets and maintains the temperature in aquariums within one-degree accuracy. There are so many things about it that set it apart from the normal heaters that you can come across on the market today.  It comes in several other versions that are suitable for larger aquariums.

What I like

Once you plug it in, it will safely and efficiently raise or lower the temperature of water in the aquarium to your set level. There is no much work for you to do when you have this heater installed in your aquarium. That is because most of the functions are automated. Though it has a preset temperature of 76 degrees, you can program it to colder or warmer.

What I don’t like

This heater has a fairly short lifespan. It is a weakness that many aquarists would dread it for. People like to invest in durable gadgets and equipment, and that is partly the reason why this heater may fall short of many aquarists, expectations.

  • Saves space
  • You can program it
  • Simply set it and let it work on its own
  • Ideal for both salt and freshwater
  • Very accurate
  • Not the most durable heater around

This heater is classified as a mini heater. As you can see, it very small, though the size is not proportionate to its effectiveness. You can invest in it and never regret it for it is designed to deliver just what the manufacturer promise. The size makes it suitable for space preservation.

What I like

Since it is fully submersible, this heater features a waterproof seal that ensures that the internal components are completely protected from water damage. What you get is a heater that can stand the test of time, delivering nothing but the best without any interruptions. Together with its impact resistant design, this heater can survive all the harshness that it may be exposed to.

What I don’t like

I do not like the fact that this gadget can only be mounted vertically even though it is not a big deal. Some people might find this very inconvenient. Also, I have noticed that this heater is not always accurate. That is to say, it is accurate but sometimes it loses that accuracy.

  • Setting temperature dial is easy
  • Used in salt and freshwater
  • Easy to install
  • Saves a lot of space
  • Durable
  • Loses its accuracy some times

Fish like tetras thrive well in environments with well-regulated temperatures. There are so many reasons why this heater stands out as the best. Among other things, it features an adjustable heat setting that easily responds to your directive. It is a pretty small-sized fish tank heater with the qualities that are also found in its pricier counterparts. Many people love it not only for its size but also for the way it functions and delivers the best possible performance in regulating the temperature of your aquatic tank.

What I like

It makes water accurately warmer, and just warm enough for fish to live in. you should not take chances with the lives of your beautiful aquatic pets. This heater is capable of making the animals calm and happy. It also helps make their metabolic process efficient. The suction cups make it easy to install and to put into place in the right position.

What I don’t like

When it malfunctions it can kill the fish. That is why you must check the heater for breakages to ensure that it does not cause destruction. You can save the day and harbor yourself from the loss if you act on time whenever it shows any signs of malfunctioning.

  • Suction cups make it easy to install
  • Creates ideal condition for fish
  • Keeps check of the temperature
  • Boasts very tough exterior
  • Improves the health of fish
  • The suction cup may malfunction and refuse to stick

Coming from a top brand such as Aqueon is an added advantage. The company is known to produce some of the best aquatic tools and equipment, and this is just one of them. From it, you should expect value for your money. It has some of the best features geared towards making it highly effective in regulating temperature in tanks.

What I like

This heater comes with a thermostat that you can trust to keep the temperature within the desired level. Since it has preset temperature, you will not have to be there to adjust it every time such adjustment is required. It has a small footprint that is very space-saving. That way, it also does not divert attention from the fish and the tank. It has a design that also keeps it well adapted for the aquatic environment. That is partly the reason for its superb durability.

What I don’t like

It lacks the option to adjust the temperature. That means it maintains just one maximum temperature and nothing more. Also, this heater can short circuit in the tank if not properly installed or if you do not analyze it to before install it and it happens to have breakages.

  • Comes with instructions that are easy to follow
  • Space-saving design
  • Automated
  • An indicator shows you the status of water
  • Durable
  • Can be installed vertically or horizontally
  • No temperature options

Things to Consider

Most fish depend on their surrounding water to regulate their body temperature. This is because they are cold-blooded animals and choosing the best aquarium heater would be the best thing to do. Some of you may think that there is no need to buy an aquarium heater but trust me, if you are keeping tropical fish then you will need a heater because it ensures that the fish tank does not get too cold and regulates the temperature of the tank. Here are some tips that will help you on how to choose the right aquarium heater;

Size of Your Fish Tank

The size of your fish tank should match with the size of the aquarium heater. A small tank will need a smaller wattage while a big tank will need a higher wattage. Add 5 watts (W) for every 1 gallon of water in your aquarium, so if you have a 20-gallon tank then the suggested aquarium heater size should be 100 watts.

Type of Heater You Need

The common types of heaters are submersible and immersible. An immersible heater lies above the waterline while a submersible heater operates completely underwater. Most people prefer a submersible heater because it can effectively adjust to the water temperature. You should place the heater right next to the filter output for the maximum flow of heat. Positioning your heater at a degree of 45 is the best way to get a good distribution of heat although some mount it vertically while others prefer the heater in a horizontal position.

The Temperature Required

You should know the kind of temperature your fish requires. If the fish tank is located in a very cold environment, the best heater to buy will be the one with higher watts but if the environment is hotter you might consider a heater with lower watts. Also, if you have a big fish tank, instead of buying one 200W heater you should buy two 100W heaters. This will act as a backup if one heater is damaged hence preventing the water from getting cold. If you choose to buy two heaters, place them at opposite ends of the fish tank.

Do you want the heater to be seen or not?

If you prefer your heater visible, buy an immersible one but if you want it to be invisible so that people cannot see it, you should buy a substrate heater. Substrate heater comes in the form of wires which are fixed onto the base of the fish tank making it less visible. It also heats the aquarium water more evenly.


You should install a thermometer in a corner just opposite the heater. This helps to make sure that the heat is reaching the other side of the tank. The heater should be placed in the water when it is turned on. Do not forget to turn it off after removing it from the water and the best thing is that the aquarium heater does not require special maintenance. I hope that the above tips will assist you in choosing the right aquarium heater.

Frequently Asked Questions

Q: Are fully submersible better than half submersible heaters? Why?

A: Yeas they are better. The fully submersible heaters provide aquarists with more freedom to position the heater whenever they want in the tank. It is you to decide where to put the heater in the tank, and that is an advantage.

Q: How does heat flow from the heater to the rest of the tank uniformly?

A: Due to the flow of water from your filter, heat will circulate faster top the rest of the tank. The filter will, therefore, mix the water thoroughly.

Q: Can the heater burn the fish when it gets into contact with it?

A: Not really. These heaters are designed in such a way that the casing keeps the fish away from the heating element.

Final Verdict

This best heater for a 5-gallon betta tank should be helpful to any aquarist who needs to keep the fish in their aquarium healthy. So if you are looking for a suitable fish tank heater for your 5-gallon betta tank, maybe one of these is what you need. They are all worth giving a try for whatever each is worth. Use the buyer guide above to select the one that best meets your unique needs. You should also learn to take good care of the heater if you want it to continue serving you to the best of its capacity. I hope this guide helps you find exactly what you and your fish need.

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