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Best Heater For 20 Gallon Aquarium 2022

best 20 gallon aquarium heater we will discuss in the article obviously  Your aquarium’s temperature is a significant factor in the comfort and well-being of your fish. Fish do not create their own body heat, unlike humans and other mammals. They are dependent on the water’s temperature for maintaining the temperature of their body. This makes it very critical that you keep your tank for your pets at the right temperature. This heater tutorial for the aquarium covers what you need to read about heaters.

20 gallon aquarium heater
aquarium heater

best 20 gallon aquarium heater

It’s not hard to choose the type of heater to use in your aquarium as long as you know the differences among heater varieties. Aquarium heaters are available in four basic types: immiscible heaters, submersible heaters, substrate heaters, and filter heaters. 

Submersible Heaters 

As is clear from the term, it is possible to fully submerge these heaters in aquarium water. These are long, thin tube-like heaters that you can attach through suction cups to the inner aquarium walls.

With the aid of a few clips, you can also attach them. This heater is completely covered in water, which is why it is more powerful than any other heater type.

This system can be positioned at any angle, but it is easier to position it horizontally so that the thermostat can operate at its best level.

You will be able to read the real heater temperature quickly and turn it on and off at the right time. 


Immiscible Heaters

Immiscible ones are the second type. These heaters consist of a glass tube, wound into a ceramic or glass insert, with a heating coil in it.

Some of the types of sand in it are submersible, whereas other types are hanging heaters. They have an aquarium on one side, and they heat the water.

Although some are only immiscible on the device to the waterline level, they require nearly 50 to 300 watts.  


Substrate Heaters

  • As is easy and accurate, people bury this heater beneath the aquarium surface. It’s either sand or gravel, but under them, this heater gets a high-temperature result.
  • To achieve the desired results, they come up with a flexible cable with a heating material in it that you put underneath the gravel.
  • To raise the temperature of the aquarium water, the cable emits heat radiation. This is the best equipment for planting aquariums, but not enough for fish aquariums.
  • Providing a high or warm temperature, it is not so good. It is only useful to keep the fish sitting on the dirt, which is sufficiently warm because of the heated wire.
  • But every fish, even if they are, is not so intelligent; they won’t stay in one place all the time, because fish love to swim all over.
  • When the surface is wet, plant roots get real comfort; they grow and cultivate well in this situation.   


Filter Heaters  

There are not a proper filter and heater overtime mixture for both heaters. Although they’re two in one, supplying ample heat is not so much better.

They are like filters for cans and power. This heater’s mechanism is that it filters water in the aquarium along with the heating process.

So, not only is there clean water coming out of the filter, but it’s also hot. In this way, the double action of this heater works.

These are all four types of heaters for water. Any other one that you like the most can be selected. Underwater heaters are, in my opinion, the strongest ones.

As well as asking us about everything, they send us the best performance. They are new and also suited to safety requirements. We sometimes use underwater heaters rather than the other ones in my aquarium.

Finding the Right heater size for 20 gallon aquarium

  • The tank heater (or heater) size is dependent on the tank’s water volume, the average temperature in the room where the tank is located, and the water temperature needed for the tank.
  • The general rule of thumb is to use between 2.5 and 5 watts per gallon of actual water volume in the aquarium for the heater wattage. Sometimes, however, depending on how much you want to increase the temperature, more wattage is needed. The total heating power of all the units together should add up to the necessary voltage if you are using more than one heater. 
  • Subtract the average room temperature from the target temperature for the aquarium water in order to adapt to the room temperature. The amount of heating required, calculated in degrees, is the result.
  • Find the size of your aquarium in the left-hand column using the aquarium heater size chart below, then switch to the column that indicates the number of degrees that the aquarium needs to be heated. Moving up to the next larger size when the heating allowance is between sizes.



  • Room temperature on average: 68 degrees F
  • The temperature of target water: 77 degrees F
  • Heating necessary: 9 degrees F (77 – 68 = 9)
  • Tank size: 20 gallons
  • Size of the heater needed: 50 watts

Things to consider

What kind of fish are you stocking?

What kind of fish do you stock up on? Some animals, such as neon tetras, guppies, angelfish, and bettas, like their warm and highly stable warm water all the time. Others are a little stronger, such as barbs or swordtails, and can handle certain changes in their water temperature.


How many heaters do you need?

When you want a hang-on or submersible heater, many fishers often consider using more than one heater. If one fails, this ensures you have a backup and will help ensure that your fish do not get a shock from the water that cools around them easily. Tropical fish are particularly sensitive to water temperature changes. This can cause problems for your fish if the water temperature varies by even a few degrees, such as if it is warm during the day but then cools at night.


Are there cracks or other damage?

Unplug and let your aquarium heater cool for at least 30 minutes before removing it from your aquarium. This involves flat heaters and tubes coated with plastic. Replace the heater if it detects any signs of harm or wears. To increase efficiency and decrease the danger of overheating, remove mineral deposits or algae build-up. Wait for at least 30 minutes after returning your heater to the aquarium before plugging it back in.


Is your heater placement right?

To ensure even distribution of heat, place your heater near a drain inboard or a circulation pump. For better performance, submersible aquarium heaters can be installed horizontally near the bottom of the tank. If that is your choice, they may also be placed vertically. Keep decorations away from the heater to enable water to flow around it freely.


Is the indicator light working?

Check to make sure the indicator light is working if you have an adjustable heater. If the light is off, rotate the control dial slowly until the indicator comes on and gently put your hand on the lower part of the heater tube to see if it produces heat. Once the element is working satisfactorily, reset the dial to the desired temperature.


Is the temperature adjustment correct?

Differentiate the heater set to the reading of your aquarium thermometer. To achieve the optimal water temperature. Depending on the position of the aquarium, ambient room temperature, and water circulation. Controllable heaters will need to be further modified. Do not place your aquarium near a draughty place, such as a fence, an uninsulated wall, or a cold cellar. You will need a second heater if you do so, and you will also need to change it more frequently. Enable several hours before testing the results when making changes to your heater. Do not abruptly or drastically alter the water temperature of your aquarium, as this can stress your fish.


Heating challenges

Problems make arise even the environmental conditions are perfect. The most common problem that can occur is heater breakage. You can resolve or overcome this problem by use of a heater guard.

One of the most often occurring challenges is the high raising of the water temperature of the aquarium during summers. To overcome or manage this problem and keep the fish environment cool, several steps are needed to carry out other than turning off the heaters. 

Opposite conditions may arise during winters due to failing of heaters working and in these conditions, steps are taken to keep the fish environment warm. 


Precautions to follow

  • Before removing the heater from the water, let it cool down for approximately 30 minutes after unplugging. 
  • When the heater is installed in the aquarium, allow it to settle down for 30 minutes before plugging in. 
  • Before plugging in, make confirmation that the cord and plug are dry by using a drip loop. 

            Product                 Description                 Link
Tetra HT Submersible Aquarium Heater Tetra’s 100 Watt Submersible Heater is intended for 10 to 30 gallon Aquariums. Electronic indoor regulator naturally keeps up water temperature. Forestalls overheating, broadening radiator life. No changes essential. The pointer light tells you when the water is being warmed (red light) and when it is at the appropriate temperature (green light). Silicon Carbide gems improve heat appropriation and move. Solid glass tube is warmth and stun safe. Link
Top Fin® Betta Tank Heater Keep the water in your tank at just the perfect temperature for your fish with this Top Fin Betta Tank Heater. This easy-to-install heater is full submersible, and is ideal for desktop aquariums up to five gallons. Only at PetSmart. Link
Marineland Precision Heater for Saltwater or Freshwater Aquariums This 75 watt radiator is for aquariums up to 20 gallons. Customizable temperature dial permits you to set the temperature 1 degree with each snap. Link
EHEIM Jager Aquarium Thermostat Heater 150W Completely submarine 

Thermo safey control ensures against running dry 

Will naturally kill when water level plunges excessively low.

Aqueon Preset Aquarium Heater, 50W Preset to 78F – no change required. Break safe development. Programmed security shut off and overheat insurance. Driven pointer light shows red when effectively warming. Completely submarine. Link

Why do we need an aquarium heater?

As most of the aquarium fish on the market are tropical, the majority of home aquariums need an aquarium heater. You have to have an aquarium heater for your fish unless you live in a hot climate. Otherwise, they would ultimately die either directly from the compromised immune system or from freezing to death.

Even if the fish do not die right away, when the water temperature is too cold, they will become less active. It’s really awkward for the fish and less fun for the owner of the fish.


How does the aquarium heater work?

A heater for an aquarium converts electricity to heat. A heater heats the water around it as water absorbs heat rapidly. But it has to be in the water with sufficient circulation to have a heater running. If they have reached the setting temperature, all aquarium heaters will turn off. If the water is going to overheat, no need to worry. The heater will automatically turn itself on if the water gets colder than the set temperature.

more info about

What Temperature Should My Fish Tank Be?

Are Aquarium Heaters waterproof?

Most of the market’s aquarium heaters are completely submersible. This implies that they are completely waterproof. Without a problem, you can have them fully submerged in the fish tank. In reality, they all have a “minimal water line”. The heater will kill itself if it gets too hot if it does not submerge far enough. You may as well put them entirely in the water for these full submersible heaters.

There are, however, a few heaters on the market that are not completely submersible. On them, these heaters have a “max water line”. Perhaps you won’t want to keep the water above this line. An electrical leak may be caused. We wouldn’t consider getting these heaters. Trouble and possible risk are not worthwhile.


What If We Do Not Want a Heater in My Aquarium?

If you are going to have tropical fish, an aquarium heater is a very necessary part of your fish tank set-up. Many beginners forgo the heater and choose temperate water fish instead. There are a number of goldfish and other temperate fish which at room temperature or sometimes even cooler will do very nicely.


How do you choose the right-sized aquarium heater?

A rule of thumb is 1 watt per liter of aquarium water. There is a manual thermostat in most aquarium heaters so that you can change the heater accordingly, which is important if you are in colder or warmer climates. In order to maintain a safe aquarium, the key is to try to reduce temperature variations.

Buying a quality heater is critical as cheaper ones can fail more often and kill your fish. To shield your fish from burns or secure your tank from excessive touch, you may want to consider a heater guard. You may also position an independent thermometer inside the tank for additional monitoring precautions, just in case the heater detection device fails.


For sea life, aquarium heaters are obviously important. For your tank, make sure to shop around for the best kind and mount it properly to ensure proper use. Keep an eye on your heater and how you react to your fish to make sure you give them a safe and happy life.

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