Mini Aquarium Heater 2020 – A Thorough Review & Buyer’s Guide

We bring you a review of the 10 best mini aquarium heater which will help choose the best product to keep your fish safe and sound.

Running water is often cold and aquarium water is fresh therefore, it is alright for us but for aquatic fishes it is very cold. For fish to survive in aquarium, water in it needs to be warm.

Normal water or freshwater is good for fishes. But gradually water temperature decreases which are almost negligible for us but in fact, it can affect fish’s health. Hence, to keep fishes healthy and energetic a heater is required for aquarium.

Mini Aquarium Heater 2020

Moreover, what you need for your small fish tank is a mini heater that doesn’t occupy too much space.

Mini Aquarium Heater

You have set up an aquarium and decorated it with stones and aquatic plants. Additionally, there is only space for fish to spend time. But as everyone who keeps fishes take well care of them so their top priority is fish health, therefore, a heater is a must.

First, Due to the small level of water in small tanks temperature changes rapidly. Then, tropical fish like betta need warm water to survive. Finally, you need a heater that warm-up water accordingly and doesn’t take too much space to hurdle fish movement.

Best Heater for a small aquarium

So, here is a review of the 10 best mini aquarium heaters keeping in mind that it takes little space and warm-up the water. For warming up water for 1-20 gallons of water, these 10 mini heaters are best for your aquarium. So, without further wait let us get straight to reviews.

Aquarium Heaters RATING PRICE
Orlushy Digital Smart Aquarium Heater ⭐⭐⭐⭐⭐ Check Price
Fluval Marina Submersible Heater for Aquarium, Mini ⭐⭐⭐⭐⭐ Check Price
Aqueon Mini Heater for Aquariums,5W ⭐⭐⭐⭐⭐ Check Price
Aquatop Nano Aquarium Heater, 15-Watt ⭐⭐⭐⭐⭐ Check Price
GOOBAT Mini Betta Heater for Aquariums ⭐⭐⭐⭐⭐ Check Price
Cobalt Aquatics 31020 Mini-Therm Heater ⭐⭐⭐⭐⭐ Check Price
SZELAM 25W Smart Mini Aquarium Heater ⭐⭐⭐⭐⭐ Check Price
DaToo Aquarium Heater Mini Betta Flat Fish Tank Heater ⭐⭐⭐⭐⭐ Check Price
ATP Heater Nano 25W ⭐⭐⭐⭐⭐ Check Price
Mini Aquarium Heater ⭐⭐⭐⭐⭐ Check Price

1.     Orlushy Digital Smart Aquarium Heater

Orlushy aquarium nano heater is fully submersible 2 in 1 unit for mini tanks. This is the best nano aquarium product of small tanks because it is a compact product of heater and thermometer. It can be installed vertically and horizontally but need to completely sink into the water to warm it.

Orlushy Digital Smart Aquarium Heater

This product comes for micro to the small fish tank with 50W 100W 150W. 50W for 3-10 gallons of water.100W for 10-20 gallons.150W for 20-30 gallons. The temperature range varies from 65°F~93°F.

LED display design so you can easily set temperature and check the real-time temperature of the water.  It’s safe and easy to install. Heater and thermometer are installed into one product.

Product Details

Item Dimensions: 4 x 2.8 x 1.6 inches.

Product Weight: 8.6 ounces.

Main Feature: Led display and 2 in 1 thermo-heater.

Package Included: Product bag

Extra Features: 50W-100W-150W for different aquariums, the temperature range of 18°C~34°C.

2-1 Thermo-Heater

This heater comes with both thermometer and heater composed into one product. For the miniature aquarium, vertically or horizontal installation with an external temperature controller. So, you can alter the temperature of water by using an external controller.

LED-Display and Indicator

LED-display design for miniature fish tank makes this temperature easy to use. It warms up water quickly and maintains heat for a long time. When the heater is running and when it isn’t an indicator is installed so you can see.

Pros
  • 2 in 1 Thermo-Heater.
  • LED display design.
  • External Temperature Controller.
  • Easy to install and use.
  • Heating light indicator.
Cons
  • Not great for micro aquarium.

In the end, this is an ideal product of a mini aquarium or a small aquarium. It contains all the features essential in the best small fish tank heater. So, if you are looking to buy an aquarium heater then this is the best recommendation you ever going to get. It warms up water accordingly.

2.     Fluval Marina Submersible Heater for Aquarium, Mini

For instance, your betta fish only stay at bottom of the aquarium. Also, you check to see if fish is doing alright. You found your fish is feeling cold because the low level of water changes temperature rapidly. So, you need the best mini aquarium heater to keep your water warm.

 Fluval Marina Submersible Heater for Aquarium, Mini

Fluval Marina 25W is a fully submersible heater for a small aquarium that can warm up water of up to 5.5 gallons. This best small heater is practically easy to use and install. This heater was manufactured keeping in mind the safety and convenience of the user.

This heater is made of durable high-impact glass. Bumper guard for fish safety with an easy to dial-in temperature. On/off light indicator when the heater is working and when it isn’t.

Product Details

Item Dimensions: 1.3 x 5 x 10.5 inches.

Product Weight: 6.4 ounces.

Main Feature: Fully submersible heater with bumper guard.

Package Included: Product bag

Extra Features: Up to 10 gallons heat up, on/off indicator, easy to use and install.

25W 50W Submersible Heater

25W and 50W submersible heater for fresh and saltwater in the miniature fish tank. It can heat up to 10 gallons of water. Waterproof sealing and includes bracket for easy installation. It has a 1.8-meter electric cord.

Impact Resistant and Bumper Guard

Aquarium Nano heater with impact-resistant glass and waterproof sealing. A bumper guard is available so that fish fins don’t get stuck in the heater. The impact-resistant glass if due to some accident heater doesn’t break.

Pros
  • The fully submersible heater of 25 and 50 Watt.
  • Bumper guard and waterproof sealing
  • Impact-resistant glass
  • On/off indicator light
  • Horizontal or vertical installations using suction cups.
Cons
  • Set temperature or else It will be heated up too much

For a miniature fish tank, this product is the best for a mini tank or aquarium. Waterproof sealing and bumper guard for protection make this heater the best choice. So, if you are looking to buy a small heater for your fish tank then this is one of the best products to get your work done.

3.     Aqueon Mini Heater for Aquariums,5W

Aqueon smallest heater is a fully submersible ideal product for small glass or acrylic desktop aquariums up to 2.5 gallons. Additionally, this mini heater is best for the warmth of tropical with an aquarium with at least 1 gallon and a maximum of 10 gallons.

Aqueon Mini Heater for Aquariums,5W

Whatever heater you are looking for must be best in warming and maintaining the environment of your aquarium. It should not hurdle any movement of fish that’s why this product is one of the best Nano aquariums heater.

Nevertheless, this best smaller heater comes with suction cups so that it can be installed vertically and horizontally. To sum up, this Aqueon mini heater aquarium is fully submersible and easy to use and install with suctions cups to mount it to either wall of aquariums.

Product Details     

Item Dimensions: 1.1 x 0.9 x 3.1 inches

Product Weight: 5.6 ounces.

Main Feature: Effective heating and shatterproof construction.

Package Included: Product bag.

Extra Features: Up to 2.5 gallons heat up, easy to use and installation, suction cups.

Effective Heating with Easy Installation

One small heater with quick and easy installation when comes with effective heating then you need nothing more to make your aquarium water warm. This Aqueon mini heater is best for effective heating and comes with easy and quick installation.

Suction Cups and Shatterproof

Aqueon mini heater has suction cups. So, you can install it on either side wall of the aquarium for effective heating. Due to this placement fish movement doesn’t get stranded. Due to small misplacement or mistake, this mini heater doesn’t break because of shatterproof construction.

Pros
  • Fully submersible.
  • Effective heating.
  • Suction cups for horizontal or vertical placement.
  • Easy to use and install.
Cons
  • You should avoid using it for less than a 1-gallon aquarium.

To conclude, this mini aquarium heater is an ideal product for aquarium from 1 to 10 gallons. Effective heating and suction cups make this product the best safety product. Shatterproof construction makes this product durable. So, you must consider this product if you are looking for a mini heater.

4.     Aquatop Nano Aquarium Heater, 15-Watt

Aquatop’s 15-watt Nano Aquarium heater is best for a fish tank of up to 4 gals. It is unbreakable with reinforced plastic with a precise thermostat which gets shut down when reaches the desired temperature.

 Aquatop Nano Aquarium Heater, 15-Watt

The thermostat is pre-set at 77 degrees Celsius and temperature-controlled accuracy of +/- 1.8 degrees of Fahrenheit. This mini aquarium heater is best for Nano Aquarium because it warms from 2.5 to 4 gallons of water efficiently.

Suction cups are built-in so that it doesn’t occupy too much space in mini aquarium heater. Nano tank heater with a built-in suction cup for easy and quick installation is what this product is made of.

Product Details

Item Dimensions: 0.8 x 0.9 x 5.4 inches

Product Weight: 5.6 ounces.

Main Feature: Unbreakable with reinforced plastic and precise electronic thermostat.

Package Included: Product bag.

Extra Features: Pre-set thermostat at 77 degrees, built-in suction cups, Temperature Controlled Accuracy of +/- 1.8 Degrees Fahrenheit.

Precise Electronic Thermostat and Unbreakable

Temperature controlled accuracy of +/- 1.8 Degrees Fahrenheit and reinforced plastic makes it unbreakable. Precision is one main feature of this product. 100% accurate temperature heating and the accurate thermometer are installed for precise reading.

Suction Cups and Thermostat

Suctions are built-in for easy and quick installation. When the desired temperature is reached, the heater automatically gets turned off. Temperature is pre-set at 77 degrees.

Pros
  • Unbreakable with reinforced plastic.
  • Precise electronic thermostat.
  • Pre-set at 77 degrees.
  • Controlled accuracy of +/- 1.8 Degrees Fahrenheit.
  • Built-in suction cups.
Cons
  • Short life-span

This is an ideal product for micro aquariums. This best nano heater aquarium comes with exclusive features that are best for your nano aquariums. So, if you are looking to buy a nano tank heater you must consider this one.

5.     GOOBAT Mini Betta Heater for Aquariums

To illustrate, the best smallest heater for tropical fish is the one which warm-up water accordingly and doesn’t occupy much space. GOOBAT Mini heater is a fully submersible heater made of PPC plastic which makes it’s more durable than other glass heaters.

GOOBAT Mini Betta Heater for Aquariums

Furthermore, Red indicator light is present so you can see when the heater is working and when not. Suction cups are available for easy and quick installation.

At last, GOOBAT mini heater is 15-watt and can warm up to 10 gallons. For betta 78 degrees is a must. This product is pre-set at 77 degrees so it can ideally warm-up the water.

Product Details

Item Dimensions: 5.3 in L x 1 in W

Product Weight: 5.6 ounces.

Main Feature: Designed to automatically reach 78 degrees Fahrenheit and maintain it.

Package Included: Product bag.

Extra Features: Suction cups and PPC plastic.

Fully Submersible Heater

The betta tank heater is fully submersible and made of PPC plastic which makes it more durable than other products. Furthermore, it has a red-light indicator which shows that heater is working. The present temperature is set at 77 degrees.

Suction Cups and Automatic Heating

Similarly, suction cups are built-in for quick and easy installation. Additionally, no manual settings are required this mini heater automatically set the temperature at 78 degrees and shut off when the desired temperature is reached.

Pros
  • Fully submersible
  • PPC plastic
  • Automatically heating
  • Red-light indicator
  • Durable
Cons
  • Automatically heating sometimes becomes a hurdle.

To sum up, this product is made of PPC plastic so it doesn’t heat itself but only heat water. Additionally, automatically heating comes in handy. So, if you are looking to buy a mini heater then you should set your eyes on this one.

6.     Cobalt Aquatics 31020 Mini-Therm Heater

Whatever your reasons may be durable product always comes first in your mind. This product is made of thermal-plastic polymer that is shatterproof. This heater is fully submersible and warm water up to 5 gallons.

6.     Cobalt Aquatics 31020 Mini-Therm Heater

Moreover, the internal ceramic heater provides even and the best heat distribution. Perfect for fresh and saltwater aquariums. Furthermore, it will raise the recommended size aquarium temps up to 10° above ambient temperature.

For instance, this product will maintain up to 10° above the present temperature. Meanwhile, a fully submersible heater made of the thermal-plastic polymer so it doesn’t affect fish health.

Product Details

Item Dimensions: 5 x 1 x 1 inches

Product Weight: 4 ounces.

Main Feature: Thermal-polymer plastic with temps up to 10° above present temperature.

Package Included: Product bag.

Extra Features: Internal Ceramic heater

Internal Ceramic Heater

Internal Ceramic heater provides even and best heat distribution to every part of the aquarium. This makes betta or other tropical fish remain well-reserved. It is made of thermal-polymer plastic which is shatterproof.

Efficient Heating

It warms water efficiently. Furthermore, it will maintain temp up to 10° above the present temperature to make your fish live in a healthy environment. The heater is covered with polymer so it doesn’t heat up and affect fish when fish touches it.

Pros
  • Thermal-polymer plastic.
  • Shatterproof construction.
  • Internal Ceramic Heater.
  • Up to 10° heating.
  • Up to 5 gallons heater.
Cons
  • This heater is not that much durable

In the end, one can say this product is best for mini aquariums. If you are looking to buy an automatic heater then this one is top-notch. So, what is waiting to go on this is one of the best aquarium mini heater.

7.     SZELAM 25W Smart Mini Aquarium Heater

SZELAM Smart Mini Aquarium heater is one of the best there are on market. Special features like smart control, high quality, easy to use makes this product the best mini heater. Its size and quality are assured. Mini size of the heater and easy to install and use makes this product top-notch.

SZELAM 25W Smart Mini Aquarium Heater

Smart Control makes this heater easy to install. Nevertheless, no thermometer and no operations are required. It automatically turns on/off according to the temperature of the water. This setting makes it an energy-efficient product.

Built-in suction cups are available for quick installation. Prevent electric shock and burns to keep fish and your family safe. High quality made by heat resistant ABS housing, sandy quartz filler, and MCH Alumina ceramic heating system. Assured Product by CE, ROHS, FCC certifications.

Product Details

Item Dimensions: 5.3 x 1 x 0.7 inches

Product Weight: 5.3 ounces.

Main Feature: Smart heater with high quality and assured certificates.

Package Included: Mini Fish Tank Heater+ 2PCS Aquarium Decor Artificial Plant.

Extra Features: Suction cups and Electric shock and burn prevention.

Smart Control and Easy Use

Specifically, if we are talking about the easy use of a mini heater then this product tops the charts. Smart control is available meaning it turns on/off automatically and regulates between 73ºF-82ºF. Ideal outlet filter and electric shock and burn prevention make it the best mini aquarium heater.

High Quality and Mini-Sized

Fully submersible heater providing constant warm water to keep your betta healthy. Additionally, it is made by heat resistant ABS housing, sandy quartz filler, and MCH Alumina ceramic heating system, anti-explosion & cracking. Moreover, this product is certified by CE, ROHS, FCC certifications.

Pros
  • Smart Control.
  • High Quality.
  • Mini-Sized.
  • Certified Product.
  • 1-year warranty.
Cons
  • May electrolyzed water sometimes.

To sum up, this product provides constant warm water and keep the temperature in check. Easy to use and automatic control makes it best. Additionally, Assured certificates and the heat-resistant and ceramic heating system make it the smallest tank heater. So, while buying the smallest aquarium heater you must consider this.

8.     DaToo Aquarium Heater Mini Betta Flat Fish Tank Heater

Perfect small fish tank heater is the one that occupies less space so it doesn’t affect the activity of our betta. Therefore, DaToo small aquarium heater makes all this possible. Now, your betta can keep itself warm and roam freely in a miniature fish tank.

DaToo Aquarium Heater Mini Betta Flat Fish Tank Heater

Furthermore, this mini heater maintains a temperature between 75°F and 82°F so, you don’t need to worry about its operations. With no extra work, all you have to do is plug-in and get going. For safety purposes, the output voltage is only 24V. This keeps you and your fish safe from electric shock.

What’s more, is PTC heating which has better thermal conductivity than other heaters. Furthermore, no breakage, no Explosion even your child can operate it. It has a 1-year warranty and can be used in freshwater only.

 Product Details

Item Dimensions: 3 x 2 x 0.26 inches

Product Weight: 7.2 ounces.

Main Feature:  PTC automatic heating.

Package Included: Product bag.

Extra Features: Super small and turn off when not fully submerged in water.

PTC Heating and Mini Size

First, Automatic Heating with no operations with better conductivity. Second, Mini Size makes it easily operable in 1-2 gallons. Then, no breakage and no explosion make it safety top notch. Finally, even a child can operate it all you have to do is fully dip it in water and plugin and you are ready to go.

Safety and Warranty

For safety, 24-volt output prevents electrolyzing water. Furthermore, environmental protection and energy-saving make it a perfect product. It has a one-year warranty which shows how much durable this product is.

Pros
  • Super Small and Thin size.
  • 24V safe voltage.
  • Power off After leaving the water.
  • PTC Heating.
  • One Year Warranty.
Cons
  • Saltwater will collude the shell of the heater.

In the end, this is the best product for nano tanks. PTC heating and safety measures make it one of the best small tank heaters. So, what are you waiting for, this product is best for your betta.

9.     ATP Heater Nano 25W

ATP Nano Aquarium heater provides a warm environment for your fish. Additionally, it is reinforced plastic which makes it unbreakable. Furthermore, it has a quick installation and is completely easy to use.

ATP Heater Nano 25W

For instance, you are away from the house and forgot to check your aquarium temperature. Then, you need to worry because this Nano heater automatically turns off when the desired temperature is reached.

Moreover, it has built-in suction cups for quick installation. ATP heater is ideal for the nano aquarium. To sum up, this is a perfect heater for the nano aquarium as it occupies less space and provides constant heating.

Product Details

Item Dimensions: 8 x 6 x 6 inches

Product Weight: 5.9 ounces.

Main Feature:  Precise Thermostat

Package Included: Product bag.

Extra Features: Suction cups and pre-set at 77 degrees.

Smart Heating

For example, you put a heater in the aquarium and left it open and gone shopping or to the job. Then, you will want to quickly go home so you can set temperature so it won’t overheat. For this heater, you have to forget about this problem because this heater is pre-set at 77 degrees and turns off when the desired temperature is reached.

Suction Cups

For instance, your fish roam freely in the aquarium and you put a heater in it. Then, your fish might touch heater which may or may not hurt your fish. In this case, Suction cups are available so your heater can be placed against the wall of the aquarium and doesn’t hurdle fish movements.

Pros
  • Provides Automatic heating.
  • Temp Pre-set at 77 degrees.
  • Suction cups for quick installation.
  • Precise thermostat.
  • Ideal for nano aquariums.
Cons
  • Not best for 1-3 gallons aquarium.

In the final analysis, this heater is best for nano aquariums. Additionally, features like heater turn off when the desired temp is reached and suction cups are available for quick and easy installation. So, if you are looking to buy a heater for 4-10 gallons aquarium then, this heater is recommended.

10.     MQ Mini Aquarium Heater

It is a fully submersible heater that is made of shock-resistant. Additionally, Shatterproof construction makes it durable and quartz glass which is perfect for fresh and saltwater both. Moreover, it can reach a temp of 94℉ and you can see the temp in Celsius and Fahrenheit as you like.

Mini Aquarium Heater

Furthermore, on/off indicator light is available so you can see whenever the heater is working. Additionally, Safety control is present in case of dry heating. Besides, heating automatically turns off when the water level is too low.

On the whole, smart heating and shatterproof construction with the latest LED digital display. All these features make this product best for mini aquarium.

Product Details

Item Dimensions: 8 x 6 x 6 inches

Product Weight: 5.9 ounces.

Main Feature:  Precise Thermostat

Package Included: Product bag.

Extra Features: Suction cups and pre-set at 77 degrees.

Safe Tank Heater

What is the most important thing in a mini heater? To make sure it occupies less space and doesn’t hurdle moves of fish. This mini heater can resist shock and is made of quartz glass. It can reach a temp of 94 degrees. Additionally, it is perfect for both fresh and saltwater.

LED Display Design

This mini heater comes with the latest LED-Tech. Additionally, you can easily see the current temperature of the tank. Moreover, there are suction cups for easy use of a mini heater. To sum up, it has every feature that keeps your fish safe and healthy.

Pros
  • Shock resistant.
  • Shatter-proof.
  • Perfect for both fresh and saltwater.
  • Pre-set at 77 degrees.
  • Suction cups.
Cons
  • Not durable for too long.

In conclusion, this mini heater has every feature that is a must for a mini heater. In short, this heater occupies less space and warm-up water just fine. So, if you are looking to buy a mini heater to fulfill your needs then this one is on top of the list.

Buyer’s Guide

For instance, you go into the market to search for the best mini aquarium heater there is to keep your fish safe and healthy. You are looking for a mini heater that is of fair price and fulfills your needs. Therefore, you must know a few things before selecting a mini heater. These few things are important features that can keep your betta life safe and healthy. Those features are:

Smart Heating

For example, you go out of your house to work and won’t come back in 6-10 hours. Then, you have a mini heater that is on in your aquarium. You are worried that it might overheat. Well, all the reviewed heaters have a feature known as smart heating meaning it turns off when the desired temperature is reached.

Suction Cups

The most important thing in nano or mini aquarium is to manage space for the heater so, that it will not affect fish movements. Therefore, Suction cups are present. They provide two advantages. First, they make your heater easy to install. Second, due to suction cups heater can be installed to either side of the wall of an aquarium.

Precise Thermostat

For instance, you placed heater in your aquarium and come back after some time to check on your betta, and the water temp is not increasing it is cold. This problem arises because some mini heaters don’t have a precise thermostat. To illustrate, this feature makes sure your water temp remains between 77 and 79 degrees which is the best temp for a betta.

Latest LED-Tech

All the reviewed products have the latest LED- technology. To illustrate, LED-Tech is easy to use and can be controlled via an external controller. You can easily see the current and set temperature and change it. This advanced tech provides quick and easy operations to set your heater according to your desired settings.

Warranty

Durability is the main feature of every product. For a buyer, it is the main point that how long can a product last. All the reviewed mini heaters are durable and have a warranty of up to 1 year. This shows how durable a product is. Additionally, a mini heater should be able to warm up water for at least 6 months.

Conclusion

Well, all of the reviewed products are unique and have top-notch features to make your betta live comfortably. But some things make a product best among the best. Furthermore, the longer a product lasts the more demand it has. So, whenever buyers go out to buy a mini aquarium heater, they always look for the one that completely fulfills their needs.

In our opinion, Orlushy Digital Smart Aquarium Heater tops the chart. To sum up, this product has every feature that is necessary for betta healthy life. It is a 2-in-1 Thermo heater and warm-up water efficiently. It occupies less space and provides an environment that your betta loves the most.

In the end, we would like to thank whole heartily for going through our reviews of the 10 best smallest aquarium heater. We hope that this review will make you choose the best of the best mini heater that meets your needs.

Frequently Asked Question

Q1. What is the best type of heater that is best for a mini aquarium?

There are many types of heaters. But the best one in mini aquarium heaters is a submersible one because you fully dip it in water and it warms water efficiently.

Q2. How long should I leave the heater on?

Well, you don’t have to worry about turning it off because it automatically adjusts temperature that is best suited for a betta. But while changing aquarium water turn off the heater and after 30 mins change the water and turn on the heater.

Q3. Which size of heater is best for Mini Aquariums?

Well, a mini size of heater is required so that it doesn’t occupy too much space in your mini aquarium.

Q4. Where should we place a heater in an aquarium?

All the best mini heater comes with suction cups so that you can install them vertically or horizontally on either side of the wall of the aquarium.

Q5. How long does a mini heater last?

The best mini heater has a warranty for up to 1 year. A good mini heater lasts up to 1-2 years. But all the reviewed products have said to last up to 3 years.

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