Best Aquarium Heater – Reviews and Buying Guides 2021

Choosing the Best Aquarium Heater for your aquatic buddies is essential. Cause fishes can not manually control their body temperature and feel discomfort in the year’s colder months.

So to provide comfort and make them thrive, you should install an aquarium heater in your fish tank.

But, There are a lot of heaters available. It is easy to get confused to choose the best one. We have researched and accumulated a list of the five best aquariums heaters of 2021.

Alongside there is a buying guide which will guide you to pick up the best possible aquarium heater for yourself.

A Quick Comparison Table:


Our RatingPreviewProductView


palashbd 5 starVivosun Aquarium Heaterview on amazon


palashbd 4.5 starOrlushy Submersible Aquarium HeaterOrlushy Submersible Aquarium Heaterview on amazon


palashbd 4.5 starFREESEA Aquarium HeaterFREESEA 25w Heaterview on amazon


palashbd 4 starMarineland Precision HeaterMarineland Precision Heaterview on amazon


palashbd 4 star

Mylivell Aquarium Heater

Mylivell Aquarium Heaterview on amazon



Our Picks

The Best of the Best

Vivosun Aquarium Heater
Perfect in every aspect.

Best Budget Aquarium Heater

Mylivell Aquarium Heater
Filled with features, less in price

Best Heater for Small Tanks

FREESEA 25w Heater
Little in size, filled with precision

Best Heater for Amateurs

Marineland Premium Heater
Easy to use and maintain

Most Durable Aquarium Heater

Orlushy Submersible Aquarium
Heavy-duty and reliable 

Why do I need A Aquarium Heater?

Maybe you will not need an aquarium heater. The hitting issue solely depends on the habitats of the aquarium. Some tropical fishes grow sub-tropical habits and can maintain body temperature.

They can quickly adapt to a 5-10 degree celsius temperature drop or rise.

Also, a factor to consider is that heaters can cost a lot of bills. They consume a lot of power and can easily pump up your regular bill. Get a heater just when it is necessary, not a luxury.

Some fishkeepers use ambient heating like raising the room temperature or even putting up a light bulb over the water to raise the temperature.

But all this will not work if the surrounding temperature of the aquarium is low. However, this is not the only consequence that you will need to install an aquarium heater.

Let us walk through you to pick up the best aquarium heater for yourself. But there are plenty of other reasons that you will need a heater too, let’s see.

  • Cold Climate

Cold climate is the grim reaper of tropical fishes. Some part of the world faces the extremest cold weather possible. In those cases, you can not but need to use an aquarium heater. Or your pets will face death

  • Temperature Control

Temperature control is one of the critical features of an aquarium heater. They keep a consistent temp inside the tank always. They will keep the water temperature as you set up and keep it that way.

  • Fish Spawn

Some fish have a preference for spawning. Like some require a certain amount of warm temperature to grow or maintain a gender ratio.


Top 5 Best Aquarium Heaters 2021

There are tons of heaters available in the market. But not every one of them is worth your time. Also, as each of us is unique, our needs are different too.

Not every heater is suitable for everyone. That is why we have taken the massive task of shorting down some of the best aquarium heaters only for you. Here are the five best heaters you can buy in 2021


1. Vivosun Aquarium Heater

Vivosun aquarium heater comes in 6 different watt models. They offer heaters for medium to large aquariums, even for aquaculture ponds as well. This is a submersible heater.

This means that the best outcome will come when the heater is underwater. In our research in aquarium heaters, the Vivosun Aquarium Heater came out on top.

This fantastic aquarium heater consists of an explosion-proof titanium tube. The heater is made with anti-corrosion engineering for safe usage.

The versatile aquarium heater.

The Vivosun aquarium heater is a versatile one. Whether you want a heater for your fish, lizards, or even for aquaculture, you can pick up this excellent piece of machinery.

The Vivosun aquarium heater is IP68 waterproof and dustproof certified. The heater has a couple more tricks up its sleeves. Firstly, the Vivosun heater offers both internal and external thermometers.

The availability of two thermometers ensures easy operation. Secondly, this heater offers constant manual temperature controls.

Smartest aquarium heater.

Most Importantly, it also consists of double sensing probes on the top of the heater. So that it can deliver precise induction.

Finally, the Vivosun aquarium heater is smart, making variations in the temperature by itself, which can be handy from time to time. But the good things about this heater does not end here.

This great heater has a smart indicator light to show what stage the heating is in.

Above all, the Vivosun Aquarium Heater is built to maintain high-quality control standards. If you require a premium aquarium heater with premium features, do not hesitate to pick this up.

This fantastic heater has topped in every of our test results. It surely will be a fantastic buy.


See The VIVOSUN Aquarium Heater On Amazon


Highlighted feature:

  • Precise Temperature Control
  • Safety Guarantee
  • External Temperature Controller
  • Easy To Setup
  • Wide Compatibility


  • Brand- VIVOSUN
  • Package Dimensions13.86 x 3.11 x 1.93 inches; 14.07 Ounces
  • Best Sellers Rank: #6 in Aquarium Heaters & Chillers


  • stable suction cup angles
  • 1-year warranty on the product.
  • Easy to set up and use.
  • For use in fresh and saltwater


  • Good for only up to 60 gallons of aquariums.


2. Orlushy Submersible Aquarium Heater


If you are looking for a durable submersible aquarium heater, go for this beautiful little heater. The Orlushy Submersible Aquarium is suitable for aquariums of every size and type.

However, You can use this for both salt and freshwater, alongside for hydroponics and aquaculture as well. The Orlushy submersible aquarium comes in 100w-500w variables. Though this is a tough heater, it only weighs 15-52 oz and just 11 inches in length.

Usually, glass aquarium heaters are built with thin 1mm glass. But this is not the case here. The heater glass is over 2 mm thick, which makes it pretty tough immediately.

But the toughness does not end here. This excellent heater is made with explosion-proof technology. So no fear of the glass exploding due to overheating.

An admirable built quality.

Most importantly, The Orlushy heater so not just has an admirable built quality. It handles its assigned task pretty fine as well. This heater guarantees precise temperature control.

It also comes with smart features, like turning itself off when the preferred temperature is reached. The thermostat is exceptionally reliable and sensitive. This is a knob style thermostat, which maintains uniform temperature.

Also got indicators light to show heating status. And as a cherry on top, it comes with a digital display unit to show significant water and heating info.

Top-notch built quality with various safety mechanisms.

Moreover, You can also see the Orlush Submersible Aquarium Heater is a fantastic little gadget to go along with your aquarium. The built quality is top-notch with various safety mechanisms.

Aquarium fishes tend to show aggression on foreign objects like heaters or props. If you have any aggressive fish, pick up the Orlushy heavy-duty heater, which is sure to stay active with any random attack on it.
Orlushy Submersible Aquarium Heater

See The Orlushy Submersible Aquarium Heater On Amazon


Highlighted feature:

  • 300W Aquarium Heater
  • It Shows An Area To Adjust The Temperaturev
  • Explosion Proof
  • Adjustable Aquarium Fish Tank Water Heater


  • Brand-Orlushy
  • Package Dimensions : 12.52 x 3.66 x 2.24 inches; 15.52 Ounces
  • Best Sellers Rank: #3 in Aquarium Heaters & Chillers


  • High efficiency;
  • Auto shut off technology for overheat detection
  • Affordable


  • Takes so much space.

Read More:  9 Coolest Aquariums for Your Home here


3. FREESEA 25w Heater

The FREESEA heater is an attractive choice for small tanks. If you got a gallon ranging from 1-6 gallons, this one is the one for you. Firstly, The FREESEA 25w heater is fully submersible.

You have to set it inside your aquarium. But do not worry about taking out spaces inside the aquarium. Secondly, It is just 5.5″ in height and weighs 4.48oz. This is an automatic heater.

Perfect for betta tanks…

In Addition, the FREESEA 25w Heater Thrives in small tanks. They are perfect for betta tanks. So if you are a Betta enthusiast, you can pick this heater up.

However, if you have a community aquarium, yet small, the Palcao will work fantastic in that situation as well. Though do not assume that this heater lacks features.

You can see its indicator light right out of the box, which will light up while the heater is at work.

You will also get a temperature indicator sticker so that you can quickly check what temperature the water is easy. This little heater can provide 78 degrees Fahrenheit constantly.

This is amusing as it is essential to maintain a consistent temperature of the water. Also, this feature makes it easy to maintain as well.

One of the best aquarium heaters in 2021.

Above all, If your betta tank needs a heater, try this one. This particular heater is perfect for small tanks, especially betta tanks. The heater has a shorter footprint, which helps them to accommodate smaller aquariums.

So, do not hesitate to try the FREESEA 25w Heater. This is one of the best aquarium heaters in 2021.

FREESEA Aquarium Heater


See The FREESEA Aquarium Heater On Amazon


Highlighted feature:

  • Quick And Easy Installation
  • Betta Heater


  • Brand- FREESEA
  • POWER CORD: 4.9 ft
  • APPLICATION:5-15 gallon fish tank
  • Voltage: 110V-120V, 60Hz
  • Heater length: 6.8 inches
  • POWER: 50 Watt


  • 100% submerged into water
  • no need to adjust temperature
  • 12 Month Warranty
  • 24 Hour Professional After-sales Service.


  • 5 gallon tank would not recommend

4. Marineland Precision Heater

This is a heater from famous aquarium supplier Marineland. This Marineland Precision Heater comes in 8 different variants ranging from 50w to up to 400w.

So it does not matter if you have a small or large aquarium or even aquaculture set up. The Marineland heater uses a flattened mesh heating element for precision heating. Also, the heater has enhanced durability.

However, This excellent heater has a mica core heating core, WHich provides the most efficient heating all around. If you want a precise constant temperature in your fish tank, this is the one. But this heater has much more to offer.

Extremely user-friendly heater

The heater is extremely user-friendly. Firstly, it has a smart safety feature that allows itself to turn on or off when needed. This is a wonderful feature to have at your disposal.

Secondly, it has a Triac controller for superior performance. It also got a handy easy to view sliding scale, which tells the exact temperature every time.

Furthermore, there is a high visibility display from where you can quickly get additional information about your tank.

The thermostat dial is situated on top of the heater, which allows its users to set their temperature without getting their whole hands wet.

An easy-to-use and maintain aquarium heater.

Above all, the Marineland Precision Heater is a fantastic easy to use and maintain aquarium heater. If you are starting your fish-keeping hobby and need a heater, this is the one.

You can grab it without the slightest of hesitation. This aquarium heater is a user-friendly heater in general.

Marineland Precision Heater

See The Marineland Precision Heater On Amazon

Highlighted feature:

  • This 300-watt heater
  • Easy to view sliding scale
  • aquariums up to 80 gallons


  • Brand: Marineland
  • Product Dimensions : 94 x 1.63 x 16.44 inches; 11.68 Ounces
  • Best Sellers Rank: 13 in Aquarium Heaters & Chillers


  • Available Up To 400 Watt
  • With Thermal Switch Feature
  • Made Up Of Durable Material


  • Some of the People Think The Thermostat Is Not Completely Accurate


5. Mylivell Aquarium Heater


Mylivell Aquarium Heater is a fantastic budget option. The heater is made of excellent quality quartz glass and equipped with excellent double seal materials.

This heater is fully submersible. And has advanced design elements for safe operations. The heater only weighs 7.2 ozs.

The Mylivell Aquarium heater has a display. So that you can know quickly about the status of the water. Like what is the temperature of the water and the heater and so on?

This is a versatile little thing. It can be used both in the case of tropical waters or freshwaters. Mylivell heater is a reliable piece of machinery. Its quartz glass body is thicker than a lightbulb.

A great heater with decent safety features.

Above all, this great heater has some decent safety features as well. It got polarized caps, which makes sure that the water is not electrocuted. Some budget heaters can electrocute the water and could even kill the fishes too.

The heater also comes along with two suction cups for safe attachments with the body of the aquarium.

So, those suction cups will make sure that the heater will not move a bit. The good thing does not end right there. The Mylivell heater has an automatic temperature adjustment mechanism.

So you do not have to worry much after plugging it in.

Above all, All these at a very affordable price. If you need a decent aquarium heater and do not want to break your bank, the Mylivell could be a fantastic buy for you.

Mylivell Aquarium Heater


See The Mylivell Aquarium Heater On Amazon


Highlighted feature:

  • High-Quality Aquarium heater
  • Adjustable Temperature
  • Fully Submersible
  • Convenient and Safe


  • Brand: Mylivell
  • Package Dimensions : 7 x 2.8 x 1.7 inches; 7.2 Ounces
  • Best Sellers Rank: #7 in Aquarium Heaters & Chillers


  • Constructed for durability
  • Good temperature range of between 65°F to 93°F)


  • Can be tricky to set up

Best Aquarium Heaters Buying Guide 2021

Aquariums are fun hobbies. But it can easily be turned into a nightmare without the accurate pick of some items. Here we have accumulated some tips which will come in handy.

What to Look for before buying an Aquarium Heater?


Look for the guide from the manufacturer to get the exact idea of the heater’s heating capacity. If the instructions in the manufacturer’s guide are straight forward, then follow them without any hesitation.

Or there is another easy role of selecting a suitable heater. The “thumb rule” is that a 1w heater can heat 1 liter of water; similarly, 4w can heat up to 4 gallons.

Above all, If you have a giant aquarium or spaces to spare, always go for the bigger heaters. The bigger ones are much more reliable. And as the heaters come with a built-in thermostat, there is no fear of overheating.



The power of the aquarium heater varies from model to model. Usually, the heater’s power is measured as watts. The larger the heater grows, there the capability of delivering more heat rises. The bigger heaters consume more watts than the smaller ones.



Some fishes need special care for themselves. Like some fish will not stay alive if the water temperature is not suitable for them. Make sure that the heater you are getting can reach your favorite.



There are two popular types of aquarium heaters available in the market. One is a submersible heater, and the second one is an Inline heater. You can guess from the name that the submersible heater stays under the water and inside the tank.

But on the other end of the spectrum, an inline heater stays outside of the water. They are popular among small aquarium enthusiasts as the smaller tanks have less space inside of them.

But the submersible heaters are much reliable than the inline heaters. but, could hamper the natural look of your aquarium.



There are many aquariums in the market. However, the quality product does not come cheap too often. You can get a decent heater in a smaller price bracket.

You need to be sure about your set up. Is it a big one or a small one? How many times will you use the heater? All over the week or just the weekend? No, your priorities first, and then pick up your aquarium.



In short, Aquarium heaters are needed for fishes to thrive inside them, as most aquarium fishes prefer warmer waters. Yet select a heater which suits your fishes the best.

Not just relying on the reviews, choose the best according to your fish and tank size.

We hope our article has provided one or two new things about the best aquarium heater to you. I hope you will have a fantastic time keeping your fish.