🐠 Best 5 Gallon Fish Tank Heater, Freshwater Aquarium

The best 5 gallon fish tank heater is a must have for any hobbyist. There are many different types of heaters, but the safest bet is a submersible, which will be placed inside of the water and work to circulate through it with an impeller. This allows for safe, efficient heating without worrying about electrical hazards. It’s important to maintain good water quality so that your fish stay healthy and happy!

What is The Best 5 Gallon Fish Tank Heater

Preview Product Price
  Cobalt Aquatics Flat Neo-Therm Heater  Check Price on Amazon
  Eheim Jager Aquarium Thermostat Heater  Check Price on Amazon
  FREESEA Aquarium Heater Fish Tank  Check Price on Amazon
  Tetra HT Submersible Aquarium Heater  Check Price on Amazon
  Penn-Plax Aquarium Heater  Check Price on Amazon
  Fluval Marina Submersible Heater  Check Price on Amazon
  Hydor Slim Heater  Check Price on Amazon

Best 5 Gallon Fish Tank Heater Revied and Buyers Guide

Cobalt Aquatics Flat Neo-Therm Heater

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The Cobalt Aquatics Flat Neo-Therm Heater is the perfect heating solution for Aquariums and Terrariums. Get a more accurate, one touch system for your flat neo-therm heater with small or large tanks. The sleek design allows you to use it inside or outside your tank without modifications!

With a sleek, modern design and efficient energy usage, the Cobalt Aquatics Flat Neo-Therm Heater is great for all types of aquariums. Simply set your preferred temperature with one touch and this accurate thermostat will maintain the tank within .5°F. With an easy to read led display you can monitor both set temperate and actual temperature simultaneously and it includes a reversible holster/bracket that will allow you to face the heater inward or outward on any size tank (Please note product images show compatible sizes).

The Cobalt Aquatics Flat Neo-Therm Heater is an innovative heater that combines the safety, reliability, and polish of a European manufacturer. The exterior impact strength is virtually indestructible: it won’t shatter like glass heaters if you accidentally bump it or drop it on your hardwood floor. But that’s not all! Unlike cheap glass heatsts which mislead consumers with temperature ratings based on raising water 2-3°f above ambient temp., the neo therm has a precision thermostat for accurate temperature control without fluctuation.

It works by automatically shutting down should there be any concern about silicone leakage leading to overheating and possible fire hazard. And last but not least: Made in Poland!

Eheim Jager Aquarium Thermostat Heater

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The Eheim Jager Aquarium Thermostat Heater is a fully submergible heater that has thermo safey control to protect against running out of water, will turn off automatically when the water level dips too low as well as having an indicator light. It is made with shatter-proof glass which makes it safe for fresh or marine water and can be calibrated precisely through the truTemp dial. Whether you are worried about heat being thrown away because of improper placement or looking for a heater that can be installed remotely, this product is perfect for any aquarium owner’s needs!

The Eheim Jager Aquarium Thermostat Heater is the way to go when it comes to zooming in on precise temperature regulation. Fully submersible, with thermo safety control that protects against running dry and will automatically turn off once water level dips too low, this heater has been made of shock resistant and shatter proof glass for fresh or marine water, along with an On/Off indicator light for at-a-glance monitoring. What more could a fish want?

FREESEA Aquarium Heater Fish Tank

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For those of you with a small tank, or eccentric aquarist friends, we’ve got an excellent and affordable heater. Thermostatically-controlled to maintain a consistent temperature level in order to keep your fish from getting chilly, it’s designed for tanks up to 10 gallons in size. Sleek touch button makes it easy to set the desired water temperature while preventing any accidental overheating (great for safety). With Fahrenheit reading, this would also make a great gift.

Designed for a long-lasting life in water, this heater is perfect for any fish. It has been tested by the manufacturer to ensure that it retains the temperature as advertised and holds up to its promised years of usage. This product has been provided with excellent safety features so you can trust your fish will live happily. As an added advantage, our FREESEA Aquarium Heater Fish Tank provides 12 months of warranty coverage so contact us if there are any issues or concerns and we’ll be more than happy to help you fix them.

Tetra HT Submersible Aquarium Heater

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The Tetra HT Submersible Aquarium Heater does not need to be adjusted with an electronic thermostat for 78 °F. It is perfect for temperatures 2-10 gallons and can be left in the aquarium with no worries of leakage. The built-in heat sensor has a red light when heating and green when reach temperature is reached. A welcome feature would be the ability to attach it with suction cups (similar to how you would attach any phone or camera)

The Tetra HT Submersible Aquarium heater is the perfect heater for your tank because it’s sturdy and easy to use. If you often forget about your heaters or have other pets that might be interested in chewing on wires, then this one is for you! All of our heaters feature an indicator light that lets you know when they’re running – so there’s no guessing as to whether the temperature is being kept just right inside.

Penn-Plax Aquarium Heater

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Heating your tank can be difficult: the AQUARIUM HEATER makes it easy. Featuring both Fahrenheit and Celsius temperature scales, you’ll know exactly what the correct water temp is for your fish! It’s fully submersible and can be set either horizontally or vertically in your tank- so do whatever works best. You get that 1 degree accuracy too! Easy to read gauge with red alert light let’s you know when to turn off heater sooner. The Penn-Plax Aquarium Heater takes care of heating from now on!

Our Penn-Plax Aquarium Heater is the perfect solution for anyone who lives in a colder climate with an aquarium that doesn’t naturally heat up enough on its own. It’s also conveniently set at 76 degrees Fahrenheit and can be easily programmed to bring your water temperature closer to optimal levels. This heater has power settings, which is perfect if you’re planning to use it inside of a tank smaller than 5 gallons of water size.

You’ll appreciate the high safety standards we ensured in creating this product from start to finish as well, including protection against leaking and overheating with long wires that keep you safe while providing just enough juice to get those pesky fish tanks warmer and ready for relaxation during cold weather months!

Fluval Marina Submersible Heater

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The Fluval Marina Submersible Heater is a 25-watt energy-efficient system that uses only one watt per gallon of water. This submersible heater has an easy to read temperature setting dial, impact resistant glass design and waterproof sealing. It also includes brackets for the suction cups which attach securely to most aquariums; as well as a bumper guard to protect fish or other aquatic creatures from bumping into it while they swim in and out of the area near this device. Just plug in this powerful little machine when your home’s power goes out during those cold winter days!

The heater also has an easily-read temperature adjustment feature with the range listed on the device itself so you can find just the right setting without any guesswork. With a bumper guard as well, this product makes it easier than ever to keep your fish alive – no matter where they live!

Hydor Slim Heater

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Different tanks provide different ranges of water temperature. Keeping a steady level is important to ensure your fish’s health. The Hydor Slim Heater allows for easy control over your tank’s aquarium and comes with an array of benefits to optimize the livestock’s well being. Never again will you need to worry about adjusting the thermostat, as this product is ready for use in just seconds! Put it under gravel at any point in the bottom of your habitat, plug it into a power source and enjoy instant gratification from stable temperatures while keeping up with those other neccessary jobs around the house.

Our Hydor Slim Heater is perfect for keeping an area of your home toasty on those chilly winter nights. It isn’t just any heater, it is a UL listed Hydor Slim Heater that remains safe and easy to use. No glass components make this particular model incredibly safe from what we call “heating accidents” when little children or babies stumble into overfilled ashtrays.

The energy efficiency of the Hydor Slim Heater also makes it competitive with regular electric heaters off the shelf; while some models take up more space than this one or create too much excess noise, the designer took these features into account when making sure that this was not only affordable but quiet and small as well!

How to Choose the Best 5 Gallon Fish Tank Heater for Your Betta Tank Buyer’s Guide:

You’ve got your very own 5 gallon fish tank, and now you need to keep it alive with a heater! Or perhaps you want to be able to keep your 5 gallon tropical fish tank warm all year round? Whatever the reason for choosing a heater for your pet tank or aquarium, there are some important factors to take into account before making your purchase.

Otherwise, you may end up spending more than necessary on something substandard. For many people (such as myself) having a 5-gallon fish tank is the start of their journey in the hobby. Those who choose an adjustable heater must be sure that it includes information about its settings in the owner’s manual. This will help you know what type of tank it is designed for and at what temperatures your new 5-gallon fish tank should be kept.

Wattage and Tank Size:

Smaller tanks need smaller heaters. Bigger tanks need bigger heaters. A 5-gallon tank with a 15-watt heater will be underpowered whereas the same heater in a 10 gallon tank might be overkill. So when it comes to power, follow your fish tank size and apply that information to your heating unit choice.

Temperature Setting:

The water temperature of some tropical fish species changes daily based upon their environment and activities, so an adjustable aquarium or 5 gal fish tank heater is essential for keeping them alive and healthy long term. If you live in colder temperatures or want to keep more than one variety of tropicals (seriously?) then you should consider at least getting an adjustable heater so you can alter the set point as the seasons change.

Adjustable Temperature:

A good heater will have an adjustable temperature control to accommodate any type of tropical fish. It’s also important to note that these should not be used for Koi or other coldwater species. These are usually sold in settings ranging from 75-82 degrees Fahrenheit. Many online reviews will stress issues with the on/off switch and how long it may take your water temperature to rise after turning it on…so if this is a deal breaker, look elsewhere!

Thermostat Adjustability & Readability: The problem with many heaters is that they do not provide the ability to adjust them once they break down (which is very common). You should look for something with positive feedback on the internet to ensure that replacement parts are available and affordable. These can be especially useful if you live in a cold climate with temperatures below freezing during the winter months, or enjoy keeping tropical species throughout the year.

Temperature Readability:

Knowing how accurate your thermostat is will be one of your most important considerations when buying a 5-gallon fish tank heater. Buyers who need specific temperature control for their tropical fish or other water creatures should opt for something that has clear readouts that they can depend on daily. Many people are turned off by heaters that have an inaccurate reading which may lead them to overheat their tank too much!

Safety Features: Along those lines…it’s very important to know what safety features a 5-gallon fish tank heater offers. Buyers need to know that the heater has a safety mechanism in case of power surges or other issues that could lead to dangerous water temperatures. Again, online reviews can be helpful here by offering specific examples and reports about the breakdowns they encountered with their 5-gallon fish tank heaters over time.

Temperature Safety Features:

Buyers should look for a thermostat on any heater purchased which will prevent the temperature from getting too high when these units malfunction, which is very common! Buyers should also opt for digital thermometers as opposed to analog designs just be sure you understand how they work and what may interfere with their accuracy.

Ease of Use:

Some people are extremely invested in the of their 5-gallon fish tank heater, and hold them to the highest of standards. Buyers should look for heaters that will not only provide accurate temperatures but also be easy to install or adjust. Buyers can often find these online in “how-to” videos which demonstrate how these are installed as well as their maintenance requirements (some need far more work than others).

Types of Small Aquarium Heaters:

Buyers can choose from five different types of heaters that have been specifically designed for 5-gallon fish tanks! They are:

Immersible Heaters:

Buyers should look to purchase an immersible heater which is made with a glass tube. These are smaller than submersible designs, and therefore more efficient when it comes to how they heat your water. Buyers will need to purchase a thermostat adapter or other safety mechanism on these in order to ensure maximum safety. Buyers may also want to consider adding a thermometer so as not to overheat or underheat their aquarium; changing the temperature by just one degree can make all the difference to your fish’s survival.

Sump Heater:

Buyers looking for a 5-gallon fish tank heater with far more power than regular immersible heaters will want to consider purchasing a sump heater. These are designed to fit into the sump of your aquarium, and can actually be attached to an outside wall or other part of your fish tank’s frame if necessary. Buyers should also consider these if they have multiple tanks that they’d like to keep at consistent temperatures.

Under-Tank Heater:

Buyers who simply need something compact but effective may prefer an under-tank heater, which is relatively inexpensive and easy to install on top of or underneath their existing 5-gallon fish tank space! Buyers must remember that this design does not provide water circulation…so it is advised that they purchase a thermostat in order to minimize temperature fluctuations and provide the most consistency possible.

Undergravel Heaters:

A 5-gallon fish tank heater that is more like a classic aquarium filter will be considered an undergravel heater, which essentially rests below the gravel flooring of your tank (not necessarily underneath the actual 5-gallon fish tank). Buyers should make sure their heating device has enough power to meet their heating requirements throughout all parts of their water habitat! These can take up quite a bit of room under the gravel without being incredibly efficient…but they will still do well with smaller tanks or bowls. Buyers should also consider purchasing an “extras” kit if one isn’t provided with his purchase.

Commonly Asked Questions:

What is the best betta tank heater?

Buyers who are looking for the best betta tank heater will want to consider purchasing a compact, affordable unit that is tailored for their 5-gallon fish tank. Buyers can look to purchase an under-tank heater or one of the more powerful sump heaters if they have multiple tanks in separate areas of their habitat

Can you put a heater in a betta bowl?

Buyers should first check the wattage and temperature rating on any 5-gallon fish tank heater which they plan to use with a betta bowl. Buyers must also remember that some heaters simply cannot be used with bowls at all! Those who wish to find out whether or not this is possible may want to contact the manufacturer directly.

How do you put a heater in a betta tank correctly?

Buyers should first make sure that their heating device is compatible with their 5-gallon fish tank! Buyers can also check to see if the manufacturer has any recommendations for how long they should leave it before placing any of their fish into the water.

Do I need to do any maintenance to my 5 gallon tank heater?

Buyers must remember that keeping proper temperatures within their tanks does more than provide a more hospitable home for their Betta (or other species)! Buyers must have the right temperature and chemistry levels in order to keep Bacteria thriving…which keeps your water clean, healthy, and safe for all of your aquatic pets! Buyers who want these healthy conditions will want to make sure they are cleaning their 5-gallon fish tank heater regularly, as well as checking the temperature settings to ensure that they can meet your needs. Buyers may also want to consider purchasing an air stone or other filtration system, which will help keep water oxygenated and healthy for your little pet!

Why Should You Use a 50 Watt Heater?

Buyers who want more power (and precision) from their 5-gallon fish tank heater will be happy to know that there are many units that provide up to 50 watts of heating power! Buyers should also note that higher wattage heaters tend to cost less per watt than lower ones…which means you get more bang for your buck!

Why Should You Use A Submersible Heater?

Buyers who want the most versatility from their 5-gallon fish tank heater will be happy to know that there are submersible tanks available! Buyers can literally drop this heating device right into their water habitat and keep it there without worrying about it taking up space under a gravel flooring, and without having to buy any additional filtration systems. Buyers should remember that this sort of waterproof heater is usually only ideal for smaller tanks (under 10 gallons), as keeping a larger aquarium or bowl at the appropriate temperature may need something bigger.


If you’re looking for a 5 gallon fish tank heater, Mem Fish have compiled the top five best products on Amazon to help make your decision easier. We decided not to include any bad or low-quality heaters because why would you want to invest in one of those? Our list includes only good quality models that are worth investing it. Which product is going to be right for you and your needs? Take some time now and see which item matches up with what you need!

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