The Best Aquarium Heater in 2020

One of the most critical factors you must consider in keeping the well-being of your fish is the temperature of the aquarium. Unlike humans and other animals, fish cannot regulate their body temperature. They depend on the temperature of the water to keep up their internal heat level. This makes it significant that you keep your aquarium at the best possible climate for your pets.

Picking the type of warmer to use in your aquarium isn’t troublesome as long as you are aware of the differences between the assortments of heaters. There are four fundamental types of aquarium heaters: immersible heaters, submersible heaters, and substrate, and filter type heaters.

Best Aquarium Heater Reviews

Our team has spent a lot of team researching and testing the best heaters to make your life a lot easier.

1. BOEESPAT Submersible Aquarium Heater

This is one of the best tank heating products on the market. It highlights a built-in thermostat adjustable from 68 degrees Fahrenheit to 93 degrees Fahrenheit that is easy-to-adjust to achieve the best temperature for your fish. It also comes with a sensor to deliberately avoid hazardous heat. With its double seal feature, your fish is protected from electricity leakage. Additionally, it includes an anti-scald system with high-quality ABS guard keeping your fish away from the surface to prevent scald injury. This heater is ideal for aquariums that can accommodate 40-80 gallons of either fresh or saltwater. It is also explosion-proof, made with 2 mm thick quartz glass. The measurements are 14.5″, 110-120 volts with 37.4 feet power cord.


With the above-mentioned features, this is one of the aquarium heaters that is ideal for your pet fish. It’s a worry-free product that keeps your fish free from injuries and maintains its optimal well-being.


  • Built-in Thermostat
  • Can use either fresh or seawater
  • Dual Seal
  • Anti-scald system
  • Easy to install
  • Explosion-proof


  • Short power cord
  • Not submersible

BOEESPAT 300W Aquarium Heater, Submersible Fish Tank Heater for 30-60 Gallon Tank, with Adjustable LED Digital Temperature Controller, Memory & Overheat Protection Function

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2. Aqueon Adjustable Aquarium Heaters

This flexible unit comes with a programmed shut off for when it overheats. It comes in 50W to 250W, so there will be something that fits each tank size. It is made with a non-corrosive shell. The Aqueon Pro has a flexible setting that enables you to control the temperature of your aquarium in the middle of the range 68 and 88°F. It has an LED light that is continuously on. This light is either red when warming the water or green when the water is at a suitable temperature. It also has an auto shut off highlight when it overheats and resets when it cools down. This makes it ideal for both fresh and saltwater.


This shatterproof heater made from a non-corrosive material is a wise choice for your aquarium. With its adjustable thermostat, it would be hassle-free for you to adjust its temperature to your liking. Additionally, it has an LED indicator to prompt you whether the heat it is producing is good enough to keep the fish warm.


  • Auto shut-off feature
  • Adjustable temperature
  • Fully submersible
  • Red/Green indicator light


  • Short lifespan
  • Limited warranty

Aqueon 100106252 Preset Heater,Black, 100W

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3. Tetra HT Submersible Aquarium Heaters

A variety of non-adjustable heater fit for aquariums from 2 to 55 gallons, ideal for those just starting out with fishkeeping. If you are on a strict spending plan, then it is most probably the best aquarium heater for you.

This is one of the least expensive, yet most dependable aquarium heaters available in the market. It has a marker light that tells you when the warmer is on; it will be red when it is warming the water and green when the water is at the correct temperature.

This heater is instinctively set to 78 degrees Fahrenheit, which is the perfect temperature for most tropical fish. The Tetra HT Submersible are ideal for tanks somewhere in the range of two and ten gallons as it is little and easy to hole up behind plants and different adornments. In case you have a giant fish tank, you can find Tetra products accessible with higher wattages.


The Tetra Submersible is budget-friendly and is ideal for those who are just starting to pet fish. Fully submersible, so you don’t have to worry about electrical short circuits. Ensure that the heater is inside the aquarium before turning it on.


  • Affordable
  • Small, easy to hide
  • Easy to install
  • Red/Green light indicator


  • Non-adjustable temperature
  • Doesn’t work well with lidless Fish tanks

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4. Marineland Precision Heater for Saltwater or Freshwater Aquariums

This brand is renowned as the prime brand of state-of-the-art equipment for customers wanting to make an optimum aquatic environment. This unit can give you explicit control of your aquarium temperature. With an adjustable temperature dial, high-permeability temperature indicator, The Marineland Precision makes it easy to maintain your freshwater or saltwater aquarium water at the ideal temperature. A flattened mesh heating element surrounds a mica core for superior heat transfer. Highlights a thermal safety switch that averts major issues during use – the heater consequently switches on if the heat transcends an inner pre-set and automatically switches on once it cools down. A mounting brace is added to fasten the glass safely. It comes in the lifetime warranty.


With its features, these aquarium heaters are ideal for both starters and fish experts alike. It comes in various wattages suitable for any aquarium size. One of its highlights is an automatic shut-down system when the temperature reaches its hazardous level making the aquarium safe for the fish.


  • Mounting bracket
  • Easy to view
  • Thermal switch
  • Advanced heating element


  • Reports thermostat doesn’t work properly

Marineland Precision Heater for Saltwater or Freshwater Aquariums, 200-Watt

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5. Eheim Jagger Aquarium Thermostat Heater

Accessible in a various range of watts from 25W to 300W, the Ehei Jagger is ideal for every aquarium size. It is a straightforward yet efficient unit and comes in a size perfect to warm tanks up to 220 gallons. It is an entirely submersible heater that is made by a unique glass (free from poisons), which expands the heating surface and goes about as a heat shield.

The pole is totally watertight and has a programmed auto shut-off system, known as thermos-safety control. It has flexible temperature control and can be set somewhere between 64 and 95°F. It additionally has a cable length of 170cm. It also includes a dial for heat calibration.


The unique features make it suitable for any type of aquarium. It is generally safe for you and your pet fish. It’s auto shut-off system gives you a signal when the water level is too low. Also, it is fully submersible and is chemical-free.


  • Fully submersible
  • Shatterproof
  • Auto shut-off system
  • On and Off light indicator


  • Some found settings complicated

EHEIM Jager Aquarium Thermostat Heater 300W

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6. Fluval E Electronic Heater

If you wish to pet a fish, you must consider a lot of things before buying one. Proper heating of the fish tank is among the many factors that you bear in mind. Given this fact, to be sure that the fish tank is at the right temperature, the Fluval E Heater is the right option for you. It comes with a Vuetech technology making it the best state-of-the-art submersible heater today. Also, it always displays the real-time temperature with specific settings with an increment of 0.5 degrees.

Additionally, it includes an adjustable mounting bracket that can be removed or adjusted easily, keeping the screen visible in whichever direction you prefer. It also comes in 4 sizes varying from 50 to 300 watts good for 15 to 100 gallons. The company offers a 5-year warranty for this product.

It is crucial to remember that when installing the heater, avoid setting it off outside the aquarium because it may cause the thermostat to fail and not function properly. If this occurs, the thermostat won’t be able to come up with the right temperature correctly. If it must be removed from the water or while moving or changing the water, detach it from the powerhouse, let it cool for 30 minutes and reconnect it.


These aquarium heaters are considered as one of the up-to-date submersible proucts available in the market today. One of the nicest highlights of this unit is a monitor display of the real-time temperature inside the fish tank. You can deliberately set temperature depending on the sensible heat needed by your fish. Also, you can increase the heat amount with an increment of 0.5. With its 5-year warranty, it indeed is a good buy.


  • Available in 4 sizes
  • Comes with fish guard
  • Precise Temperature setting in real time


  • It has a top rating in Amazon so it is loved by most users. A few reported that it had to be replaced earlier than they felt it should

7. JBJ True Temp Titanium Heating System Kit for Aquariums

This aquarium heater is the total-package and top-of-the-range warming framework, perfect for experienced aquarists or the individuals who wish to take the hobby to the next level. This is a state-of-the-art kit that the company is showcasing.

This titanium, completely submersible heater is erosion safe and has a coordinated thermal shut-off, an advanced temperature controller and calibration setting, protective guard, and magnetic holdings. It has a hassle-free LED indicator and push-button controls to set temperature. Moreover, it has a brilliant memory chip that can re-establish the past heat settings in case of failure.


This brand is a state-of-the-art heater for aquarium system. It is the most reliable heater for experienced hobbyists. It comes with a complete warming system, from a thermal shut-off system, LED display, and memory chip.


  • Easy installation
  • Nice features
  • Suitable for experienced aquarists
  • Includes a memory chip


  • A bit costly

JBJ True Temp Titanium Heating System Kit for Aquariums, 500-watt

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8. Cobalt Aquatics Flat Neo-Therm Heater with Adjustable Thermostat

With a 3-year warranty, this state-of-the-art heater is efficient and looks contemporary and fashionable in any home fish tank. The utterly submersible Cobalt Quatics Flat Neo has an extraordinarily smooth and slim design that fits well with sassy homes; it likewise has a one-touch control framework. I has an LED that showcases where both the temperature the warmer is set to; and the temperature of the fish tank.

You can calibrate the heat from 66°F to 96°F. It has a coordinated thermal protection circuit that turns of the heater down before it can overheat and is likewise made with a shatterproof external packaging, which makes it indestructible. It comes in a scope of sizes from 25 watts to 250 watts, contingent upon the size of your fish tank and the necessary warming needs.

This is an up-to-date innovation of Cobalt Aquatics, which aims to deliver the ideal heating capacity for your fish. Comes in a 3-year guarantee, this product is perfect for expert hobbyists and novice alike. Also, it is suitable for both fresh and saltwater. It delivers an accurate thermostat with a display showing real-time water temperature versus the tank’s temperature. It highlights a one-touch control system making it easier to set up.


  • Fully submersible
  • Modern design
  • Adjustable heating ranges
  • Easy installation
  • 3-year warranty
  • Ability to turn-off before it overheats


  • Suction cups can stop sticking after a short period – need to be replaced.
  • Quite expensive.
  • Reports of short lifespan in malfunctioning products.

Cobalt Aquatics Flat Neo-Therm Heater with Adjustable Thermostat (Fully-Submersible, Shatterproof Design) From 25W To 300W

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9. Hydor In-Line External Heater

An outside the tank heater is perfect if you have a smaller size, and there isn’t sufficient space. This filter is an outside thermal heater which is ideal for both tropical and marine tanks. It has been utilized on the return line originating from canister filters or sumps, back towards the tank, and warms the water up on its way back through. The positive, warm coefficient (PTC) innovation is self-timing to avoid overheating and blowing. It includes piping between 12mm-16mm, contingent upon what size you need.

The external aquarium heaters by Hydor are considered as the first of their kind, and use Positive Warm Coefficient Technology built with the self-timing system to prevent blowing and overheating. Ideal as both saltwater and freshwater heaters for aquariums.


  • Durable
  • Not visible
  • External use
  • Easy installation


  • Makes a slight snap sound as it turns on and off.
  • Turns on and off every now and again.
  • Reports of temperature changes.
  • Some filters will require a connector

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How To Choose the Best Heater For Your Aquarium

The basis for you in choosing the best heaters for aquarium use depends practically on your needs, and your preference. The sort of type that you pick will doubtlessly come down to three fundamental variables; size, cost, and personal preference.


The essential general guideline is that you need somewhere in the range of 2.5 and 5 watts for every gallon of water volume. This can differ upon how cold the room is that your tank is in and how huge the tank is. The bigger the waterway, the slower the water will drop heat, while the littler the volume of water and the littler the your unit, the more rapidly it will lose heat, so a more oversized watt is needed.

To turn out how much wattage you need, subtract the room heat degrees from the desired degrees of your aquarium. For instance, if your room is 66°F, and you need your heater aquarium to be 76°F, you have to warm your tank by 10°F. In case you’re as yet uncertain, manufacturers typically put on the packaging what size of tank the warmer is intended for.


The cost of heating products differs per company. Picking a trending brand will generally give you the top quality. Consider your financial limit and how a lot of that enables you to spend.

Personal Preference

Which heater do you like the appearance of the most? A few people wouldn’t fret the vibe of equipment behind the glass, but others incline toward smaller, less recognizable units, and others would prefer no equipment is noticeable at all. If it doesn’t bother you that your heater will be on view, you’ll no doubt pick a submersible heater. On the other hand, if you do not like it to be visible, you might consider an outside/external type.

Other Important Concerns

Where Should I Place My Heater?

The heater should consistently be put near the filter inlet (or some other warm stream made by powerheads, etc.).

Do I Need Two Heating Units?

If you live in a cold area, ideally, you will have two units to avoid overworking of the heater if you only have one. Additionally, if one fails, you can utilize a reinforcement, like this one, to keep the water at a similar temperature.

Do I Need to Check My Heater?

Heaters overheat frequently. Alongside your other daily checks, which we’ve talked about here, you should also do a daily check on the temperature of your tank. Always incorporate a different thermometer (regardless of whether the your products accompanies one) at the far edge of the tank to guarantee the water is warmed appropriately. By doing this, you’ll get on any issues with your heater swiftly to prevent fatalities. While this may take time, it’s undoubtedly worth accomplishing for the security of your fish.Your perfectly optimized content goes here!

Even under ideal conditions, issues can emerge. One of the usual concerns is heater breakage. If that is a worry for you, maybe you ought to consider utilizing a heater guard.

Another heating challenge is throughout summer when the aquarium water temperature ascends excessively high. At times turning off the heater is not an acceptable way to avoid hazardously high-water temperature, and extra measures are required to keep your fish cool.

Meanwhile, in the winter, the reverse issue can occur. This is particularly true if the heater falls flat during this season, and actions should be taken to keep your fish warm.


We hope all of this information helps you find the best fish tank heater for your needs. We have listed the top products available on the market, but as you can see, many times which one you get comes down to personal preferences of the customer and what is right for them in the care of their fish.

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