Best Aquarium Heaters Review 2020

A comprehensive guide on why you need Aquarium Heaters and which one suits your aquarium the best.

You are sitting down in your chair, couch, idly lying around in your bed and reading this, a detailed and comprehensive guide to aquarium heaters. Let that sink in for a minute. Did you ever think for one minute in your life that someday, someday, you would be reading about aquarium heaters for Pete’s sake?  But, here you are. And here we are. So, let me welcome you to this wonderful, sometimes mundane, sometimes quirky world of the technical side of owning an aquarium in your home. It may get boring and tedious at times and we will do everything to make it simple and fun but trust us, you will be better off with all the knowledge and information you get here and you will be a better informed pet owner. The application will still depend upon you, you see, you can bring a horse to a pond but you cannot make it drink the water. So my dear horses…I mean, friends, let’s leave this babbling behind and delve into the topic.

The science behind temperature regulation in a fish tank

Bro, do you even science?

If you find the biological details of homeostasis and internal temperature regulation in fish to be too boring you can immediately skip to the next topic. But rest assured, this maybe a tad bit boring but it isn’t unnecessary.

The relation between environmental temperature and the temperature of the organism:

What is the weather like outside? Is it bright and sunny or is it cold and windy? Either way, your body temperature right now must be around 98.6°F/37°C. No, I am not some astrologer but it is a simple fact that human body temperature remains in an around 37°C unless you are sick. This is because humans, including many organisms, have to keep their core body temperatures within a narrow range. Not all organisms need to keep their body temperature in a narrow range but every organism on Earth has to regulate their body temperatures. This is because most portion of an organism’s body is made up of water and if the temperature of the body of the organism were to fluctuate with the environment it leads to various problems inside the body. Too cold a temperature and this may lead to the water inside the cells to freeze or too hot the temperature, and the body will heat beyond a safe level. Also, there are various metabolic enzymes inside the body of organisms that get denatured or stop functioning properly incase the body temperature rises. Hence, the requirement to maintain the core body temperature to a certain fixed point irrespective of the environmental temperature.

Animals broadly can be divided into two groups depending upon how they regulate body temperature.


Endotherms are organisms that use internally generated heat to maintain a static core body temperature. If it gets cold outside, they increase metabolic heat production to keep their body temperature constant. Thus, the body temperature of an endotherm is more or less independent of the environmental temperature.

Humans, polar bears, dogs, birds, basically aves/birds, and mammals are endotherms.


Ectotherms like all living organisms generate metabolic heat but just not enough heat to maintain constant body temperature. Thus their core body temperature depends upon the external heat sources in the environment.

But we read a few minutes earlier that an organism doesn’t have the liberty to let its body temperature fluctuate with the environment’s. So, the ectotherms use other strategies like behavior: seeking the sun, shade, try to find an environment within their environment that meets their needs.

Fish, amphibians and reptiles are ectotherms.

Thus, this brings us to our first point. Fish are ectotherms. Unlike human beings and unlike most of our pets, they don’t produce enough metabolic heat to keep their body temperatures at a constant point. Their body temperature and consequently their life depends upon the surrounding temperature.

Temperature and it’s effects on metabolism in ectotherms

In 1971, American Zoologist John R. Brett did research on “Energetic Responses of Salmon to Temperature” that looked at the relationship between physiology, the ecology of freshwater Salmon to temperature. He concluded that the ambient temperature is a key factor affecting the entire life cycle of fish and went on to term temperature as an “ecological master factor”.

In addition to these, reviews by Farrell and Jones 1992 and Farrell 1998 also talk about the effects of acute as well as sustained long term temperature changes on fish.

The conclusion for us fish owners is that temperature affects various physiological processes including the overall consumption of oxygen in fish.

Your fish can sense the temperatures of the water and have water preferences.

There are many studies that suggest the fish can detect temperature changes down to 0.03°C. Hence, as we learned before, as the fish cannot produce enough heat to maintain constant body temperature, they negate the effects of fluctuating environmental temperature by behavioral changes that help maintain constant body temperature. One of those changes is the preference of either warm or cold water.

If the fish is having trouble extracting enough oxygen from the water, it prefers to move to colder water because colder water retains more dissolved oxygen, as well as colder temperatures, mean that the fish don’t have to have higher metabolic rates.

If the fish are ill though, they choose to move to warner water which increases it’s body temperature as it means a difficult time for the parasite in it, a concept that is similar to the human temperature going up when sick.

Phew! That was some boring-ass info to write and read. But I hope we learned how the temperature of the water in the tank does affect the fish indirect ways.

Do you really need an aquarium heater?

Or is it just another marketing ploy to sell you stuff?

A short and sweet answer: Yes. You absolutely need an aquarium heater.

Here is something you might not have expected to hear in a fish keeping blog: fish are naturally not supposed to be kept in an aquarium. Fish belong to the wild. The lifespans, health, and size of the fish vary drastically when kept in artificial ecosystems as compared to the fish in their natural habitat.

But we have decided that we want to keep fish as pets. So the best we can do for them, infact, it is our duty that we should construct a habitat for them that mimics their natural habitat as closely as possible.

One of the most important factors in their natural habitat is temperature. Thus water heaters become essential in replicating the natural heat content of the fish you have.

Fish need a consistent temperature

The water in your aquarium or the temperature of your whole aquarium will eventually become equal to the temperature of your house. Tropical fish need a temperature of about 24°C to 27°C. Let’s suppose you keep the temperature of your home at 25°C, that does give you a loophole to not buy an aquarium heater. But the temperature of your home is going to drop at night. And so will the temperature of your aquarium. The same thing will happen during monsoon or winter. Drastic changes in temperature and fluctuations in temperature cause a lot of stress on the fish leading to many diseases and may also lead to death.

Having a heater becomes more important if you have tropical fish

If you have tropical fish like bettas, Barbs, Tetras, Guppies, a heater to keep the water consistently warm becomes even more important. Larger volumes of water in big tanks lose heat more slowly, whereas smaller tanks lose heat quicker. If you have a betta fish in an unheated one-gallon tank, he is living in a very stressful environment of constant heat fluctuations.

 Some other fish species, like goldfish, zebra dandelions, white cloud minnows can tolerate a temperature fluctuation to a larger extent than the tropical varieties.


Some fish require certain higher temperatures for breeding. And heaters come in handy.

Hence, we can conclude that aquarium heaters are worthy investments and nit just some marketing ploy to make you buy some fancy gadgets.

Types of Aquarium Heaters

There can be various reasons to choose between tank heaters. Size, breed of fish, placement, cost. That we shall discuss further into this blog. For now, we will see the types of Aquarium heaters you have in the offer:

Immersible heaters:

These heaters Hang over the top of your aquarium and have the heating element inside the tank most probably enclosed in a glass tube. for this reason the immersible heaters are also called hanging heaters

If you are a beginner and haven’t handled an aquarium before this is the best choice for you. The hanging heaters generally come along with the aquarium as a part of the starter pack in many aquariums.

If you do not have an open top aquarium, you will be needing a hole in the hood of your tank for the heater to hang by

These are most probably the most basic and hence the least efficient heaters. But this will still do the job.

These kinds of heaters are not recommended for brackish or saltwater setups.

 Submersible Heaters:

As the name suggests, the submersible heaters are submerged inside the water in the tank.

As with every other heater, the heating coil of this heater is also placed under some kind of protective covering. The covering maybe glass or hardened plastic. And as common sense dictates the glass can be prone to cracking in case of overheating where does the Harden plastic is much more reliable.

These submersible heaters are a bit more fancy then you normal immersible heaters and thus keep that water in the tank at a more constant and stable temperature then you normal immersible heater.

Substrate heater:

substrate heaters are often kept under the substrate of the tank. hence it is important that you have a certain substrate in your tank. These substrates heaters generally come in the form of wires And I fixed onto the base of the aquarium.

These eaters will in huge practice during the 90s and we’re generally used In addition to other heaters. these were believed to help in promoting growth of plant roots as they give off gentle heat.

These are not so common nowadays and are also quite expensive.

In line heaters:

Just like the submersible heaters these are fitted along with the filter because they heat the water on the way back to the tank.

These kinds of heaters are safe as compared to other heaters because they are made of  heatproof plastic.

These heaters are quite expensive and can be used in aquariums that have larger fish that forage and are aggressive with the equipment.

The downside however, is that a lot of components of inline heaters outside the tank which makes it prone two leaking

Filter heaters:

These are not separate heaters but rather are filters that are pre fitted with heaters.

These work on the principle that the water can be heated while it passes through the filter. Some canisters and power filters are fit with inbuilt heaters.

How Do I actually choose a heater for my aquarium?

Factors that shall determine what heater you should get.

Do you generally go for shopping for something, reach the shop and then become baffled by the sheer number of options available to you? Sometimes you just wander off into the wonderful world of online shopping and then become even more confused about what you should buy because of the huge options data presented in front of you on the slightest click of your mouse? Come on, I cannot be the only one.

Aquarium heaters are no different.

If you just go and search for aquarium heaters you will be bombarded by products of all sorts, shapes, sizes and colour and usage. So before moving into the vast array off heaters on display in the market let us first know how to choose what kind of aquarium heater we may need.

Yeah some of the factors that you need to consider in order to choose what aquarium heater is best for you.


Now let’s not kid ourselves, the most important factor in choosing any aquarium equipment is money. Unless you have spare money lying on your couch so as to spend openheartedly, you will want to keep in mind the price of the product.

And it is not just the asking price of the aquarium heater but also factors like reliability, maintenance cost and money you may have to spend if it is broken that determines what kind of aquarium heater you may want to get.

We will discuss these factors of the aquarium heater little later on as we delve into individual products.

Size of the aquarium

Now before beginning we must understand that Joule’s law of rate of cooling dictates that the rate of cooling is inversely proportional to the surface area off the medium. It means that the larger the body of the water, the slower it will lose heat whereas the smaller bodies of water or smaller tanks lose the heat quicker. What it means for a general aquarium owner is that if you have a smaller tank you are in danger of having a more radical temperature fluctuation which may end up harming your fish. Thus you will need a higher wattage heater as compared to a larger tank.

Now the general rule regarding the wattage of heat required is that you need 2.5 to 5 Watts of power supplied per gallon of water volume. This is no hard and fast rule and can depend upon the ambient temperature of the room and the sheer size of your aquarium. This remains closest to accuracy If the temperature to be increased is in and about the range of 10°C above the room temperature and if there is no massive amount of heat loss through evaporation i.e. if the aquarium is closed by a lid.

Aquarium sizes10°C raise in temperature More than 10°C raise in temperature
5   gallons25   Watts50   Watts
10 gallons50   Watts100 Watts
20 gallons100 Watts150 Watts
25 gallons150 Watts200 Watts
40 gallons200 Watts300 Watts
55 gallons300 Watts400 Watts
75 gallons400 Watts600 Watts

Along with the wattage of the heaters used in the tank another thing that that becomes important especially in larger tanks is the distribution of heat. If you have a larger tank it becomes common sense to distribute there source of heat evenly in all parts of the tank. So if you are using a higher power heater say of 200 Watts then it becomes more advisable to use two heaters of 100 Watts each rather than using a single heater of 200 Watts. What this does is it reduces the chances of protective covering cracking as well as reduces the drastic change in temperature in case one heater malfunctions.

Extra sources of heat:

There are sources of heat that radiate heat into the aquarium other than the heater itself. We must also keep in mind the heat radiated by the lightning factor the filtration factor and also the natural light entering into the tank while we calculate the amount of heat we want our heaters to add 2 hour aquarium.

For example, a Fluval FX4 canister filter which runs on 30 Watts of power will definitely radiate some heat into the tank acting as a mini heater.

The lights, used as decorations or higher power all spectrum lights will also definitely add to the total heat output generated inside the tank.

Placement of your aquarium

Another thing to keep in mind is the position of your tank. If your tank is kept in a place where it gets an adequate amount of sunlight then the heat generated through the sunlight will definitely increase the temperature of the water. Or if your tank is kept in a darker colder or moister part of the home then you may need to calculate the amount of temperature to be raised as compared to the immediate ambient temperature rather than the general temperature of the house. There are three ways that heat can be circulated throughout your tank.

  • Conduction:

Conduction is a method of heat transfer from areas of higher temperature to areas of lower temperature in search of thermal equilibrium. Con duction includes the movement of the particles of the material that carry the heat that means the water molecules when can heat through conduction actually vibrate because of the kinds of energy produced by the heat. But conduction mostly effects on solids a new aquarium won’t be heated that much because of conduction.

  • Convection:

In general water bodies convection is the main method of heat transfer. This occurs when the water becomes less dense and rises to the top as it warms creating convection currents when your heater warms up the water around it, the water rises to the top and displaces cooler water, which is denser so it sinks lower.

  • Radiation:

Radiation is the method of heat transfer at all cost you too studies of the sunlight. If your aquarium is pleased in a certain part of your house where it gets a lot of sunlight this will certainly make a difference in the temperature of your water. However, sunlight in normally placed indoor Ike Williams does not play that big of a role. Radiation during the night time can be the main cause of dropping temperature in the water of your tank.

  • Circulation:

Circulation rather than being a certain physical phenomenon is a forced phenomenon due to the presence of an aquarium heater inside your tank. this is the main method of heat transfer inside the aquarium ideally your filter mixes the water thoroughly to prevent any hot or cold zones from persisting inside the aquarium.

Our Choices for the best aquarium heaters available in the market

We as pet owners,fishkeeping enthusiasts and avid readers have gone on to compile a list off aquarium heaters so that you wouldn’t have to scavenge the internet for information that so many times you may not even understand.

Here are our picks for the best aquarium heaters available in the market and a brief study and review of each one of them.

EHIEM Jager Aquarium Thermostat Heater

EHIEM is a leading manufacturer of aquariums and aquarists equipment based in Stuttgart, Germany. So, you can tell off the bat that this is a well-established company. And the products reflect their well-established nature.

The EHIEM Jagger aquarium thermostat heater is a fully submersible heater and is fitted with a TruTemp dial calibration for temperature regulation.


  •  It is one of the most reliable heaters out there in the market.
  •  The protective glass used in the heater is quite thick and can tolerate a good amount of temperature fluctuation.
  • It has a high range of temperatures ranging from the mid-60s to the low 90s and thus is versatile. This makes it a good heater to have in case your fish is suffering from diseases like ICH and also helps if you have fish like Plecos and Discos that love higher temperatures.
  •  It has an emergency shutoff system that shuts the heater by itself when there is no water in the tank or when the water drops off down to a certain level.


  • The first off the bat problems you have with these heaters is that the calibration system can be a bit tricky. In fact, we recommend using a separate thermometer and not to rely on the calibration of the heater itself.
  • These heaters tend to be a bit long. And you have to maintain a certain amount of water level for them to be dipped in completely. So it may not be as handy for all kinds of an aquarium.
  • The suction cups in these heaters may not tend to work all the time.
  • These are a bit expensive as compared to other heaters.


The EHIEM Jager Is a true example of German engineering. It is well made and reliable and if you want a glass aquarium heater then this is one of the best heaters you can get. What makes it so good is its massive temperature range and in case you need your aquarium to be heated or cooled to an unusual temperature then this is really your only choice. The temperature knob and the calibration however can be a bit unreliable at times but the price makes it budget-friendly.

Hydor In-Line External Heater

This is an external thermal heater. So if you don’t like your heater to be visible inside the tank and disturb the aesthetics of the aquarium this could be the product for you. This also can be very useful for owners that don’t have enough room for a heater inside the tank.

Just like a canister filter it sort of rolls on and clamps to some of the hose and this goes on the outbound return of your canister. This way it doesn’t heat the water up and then pushes it through the filter but it just heats it and returns it directly to the tank.

This also has an inbuilt thermostat.

It can be used for an aquarium size ranging from 40 to 66 gallons and has 200 Watts as well as 300 Watts varieties. This also comes with a 12 millimeter cubing.


  • The quality of the heater is reliable.
  • This heater is the heater you go for when you don’t want the heater to distort the aesthetics of your tank because it is not visible inside the tank.
  • It is comparatively simpler to set up than other heaters
  • It has a positive thermal coefficient PTC technology which is self-timing and guarantees against overheating and blowing.


  • It has an automatic turn off and on system which unfortunately works on its own a lot of times.
  • Some reviewers report of temperature fluctuations.
  • Some of the filters of this brand will need adapter connections.
  • If your sump or canister filter feels or is turned off, no water is pumped through the heater. This means that the water temperature of your tank is going to drop until the flow returns.
  • Any extra piece of equipment do active the inline heater increases the chance of leaks our leaks are common occurrence even Wendy’s eaters are slightly incorrectly installed.


The hydor inline aquarium heater is a pocket rocket that is capable of feeding your aquarium why did she mean out of you. it is really precise with just a zero point 1 degree of a temperature swing and the setup is easy.

Fluval E Electronic Heater

Fluval markets it’s E line series of heaters largely based on the VueTech technology. This technology helps you clearly see temperature differences of more than 2 degrees Fahrenheit than the pre-set temperature by changing the color of the readout.

While in many heaters as we have discussed earlier, the temperature reading calibrations are a bit sketchy, tedious, or downright nonreliable, Fluval says that their precise temperature setting features enable the user to set the temperature of the water even at 0.5°C increments.

It comes in 100 Watts 200 Watts and 300 Watts and it’s packaged you know tall rectangular packaging.

The temperature ranges from 68 to 93 degrees Fahrenheit.

This is an internal heater.


  • This heater is particularly useful for those with a 3D background as it is included in a bracket that allows you to detach the heater and an adapter enables the heater to be set at 45 degree angle. This gives you the access to the visual display while it’s still being mounted on.
  • This heater as a consistent reading off temperature as compared to other heaters.
  • It shows the temperature in both Celsius and Fahrenheit.
  • Adjusting temperature is easier and is controlled by a push lever that allows you to adjust the temperature even by 0. 5 degrees centigrade.
  • Setting temperature is comparatively simpler. All you need to do is plug in the heater and wait while itself tests.


  • you cannot look at the heater and tell if the heating element is actually being warmed up unlike other heaters that have a light that tells you that the heating element is being eaten.
  • The cost of the heater may be prohibitive for buyers with a tight budget.
  • It requires a high water flow around it to function at its best.
  • Some users complain of it being a bit underpowered.


This is a quite sophisticated heater that has a precise temperature reading temperature increment and a best in class 5 year warranty. However, it comes at a price that tight pocketed buyers may not be able to buy.

Cobalt Aquatics Flat Neo Therm Heaters

The cobalt Neo Therm is a Polish product and is one of the most popular submersible heaters out there in the market. And with good reason.

This heater comes in a wide array of wattage ranging from 25 Watts up to 200 Watts.

The physical size off the heater also ranges from 6 1/2 inches to almost 11 inches

It is a very long power cord and the temperature ranging from 66 degrees Fahrenheit to 96 degrees Fahrenheit.


  • The design of this heater makes it look like it’s wider than your normal heaters but it actually is one of the sleekest and thinnest heaters out there. It comes with this flattened rectangular box kind of design which makes it easier to just place on the table while cleaning without worrying about it being rolled down and shattering into hundreds of pieces.
  • The covering of the heater is made up of hard plastic and contains no glass units which makes it less prone to accidents.
  • Cobalt claims that their Neo Therm thermostat is accurate to the increment of 0.5 degrees Fahrenheit and it actually is pretty accurate when it comes to measuring temperature differences it in fact is one of the most accurate aquarium heaters in the market.


  • It is not a very pretty heater to look at.
  • It is also very heavy on the pocket.
  • It comes with a 3-year warranty but many users report of short life span in malfunctioning products please stop
  • The temperature said setting unit can be a bit quirky and difficult to understand and it may take time to get adjusted with.


This actually is our editors pick when it comes to the best aquarium heater out there available in the market good stop it is a fully submersible heater and it blends into the background of your aquarium unquietly does your job it’s accurate and reliable a bit expensive and has a few quirks in the temperature setting but we highly recommend this heater.

JBJ True Temp Titanium Heaters

The JBJ True Temp heater is not recommended for beginners.  If you are an experienced fish enthusiast and you want a complete and top of the range eating system, this is The product for you.

This perhaps is the most hi tech heating system included in our list.

JBJ market their top of the shelf product on strong features like temperature increment accuracy to 0.5°F, a titanium heating element with thermal shutoff, a smart memory chip, LED heating indicator, magnetic probes, and a lot more hi-tech features.

These heaters come in a wattage range of 150 Watts to 1000 Watts.


  • These heaters have a fully digital controller with a large LED display and are easy to use and read.
  • As the company says, the heating element is made up of titanium which is virtually indestructible inside the aquarium tank and also corrosion-free.
  • The True Temp digital controller in this is fit with Remote quick disconnect temperature probe that can be placed up to five feet away from the heating element.
  • it has a proper safety guard around the heating core.
  • Unlike many other heaters that have Roberts actions to hold the heaters in place, the JBJ heaters have magnetic holders with long-lasting stability.
  • This has a smart memory chip that restores the previous temperature set point and calibration to the last stored setting once the power returns after a failure.


  • Of course with all the range of high tech gizmos deseta has it obviously is going to be quite expensive.
  • Magnets can sleep if pleased closely to the powerhead or other magnet attracting substances.
  • The magnetic probe needs to be cleaned every few months which can be a bit of a hassle.
  • The plastic face screen on the front of the controller sometimes isn’t attached very well and starts to fall off


this is the heater you want to own if you want to take your Fishkeeping hobby to the next level. it is filled with all kinds of gizmos including the noncorrosive titanium heating element and remote control temperature probes how long with Ellie D screens. this however is a bit expensive and doesn’t come in lower wattages and sometimes the quality of the JB J heaters can be a bit questionable.

Aqueon Pro Heaters

Aqueon is an Italian brand and they make these, one of the simplest heaters by usage and by design present there in the market.

These come in the wattage from 50 Watts to all up to 250 Watts ranging from a length of 8 1/2 inches to 15 1/2 inches.

It comes with a power cord of 6-foot length and has a temperature range of 68 to 88 degrees Fahrenheits and the outer casing is made of plastic.


  • It is made of all plastic shell Which makes it non corrosive and shatterproof.
  • The absence of glass also means the absence of condensation inside the heater that may hinder reading and calibration.
  • The design of these heaters is simple and does not attract too much attention.
  • You can place it vertically or horizontally or anywhere in your tank.


  • The temperature dial in this heater is honestly garbage. at times we found it difficult to even determine what temperature we had selected.
  • The markings around the dial make a simple task even more difficult because they are unevenly spread
  • Some users report that the temperature accuracy displayed by this heater can be a few degrees off.
  • The reliability of these he does is not too great they have a short lifespan and known to crack after a couple of years.


The Aqueon pro heater is a heater you go to when you are a beginner and you have a tight budget. it can do the job and every other aspect of this heater is great except for the temperature dial which looks like it is made in quite a hurry. All in all, it is a good heater that does the job it is supposed to do.


  • I have seen some aquariums without heaters. When should a heater be used and is it necessary to use one?

The idea behind having a heater in your aquarium is to maintain a constant temperature in the water of the tank. Drastic temperature fluctuations in the water cause a lot of stress as well as disease bringing conditions in the fish. Hence it becomes of utmost importance to maintain a constant temperature.

That is where the aquarium heaters come into the discussion.

Species of fish that are sub-tropical and tropical need a certain higher temperature to live a stress-less life and aquarium heaters not just allow having higher temperatures in the water but also serve to maintain that temperature throughout.

Sometimes, an aquarium has only cold water fish or species of fish that aren’t sub-tropical or tropical. These do not need to have a higher temperature to live normally. Infact, sometimes we may even need water coolers.

Another factor as to why you may not have seen heaters in some aquariums is that those heaters may be external inline heaters that are kept outside the tank. 

  • How much on an average do aquarium heaters cost?

Aquarium heaters like everything else cost as much as you can pay for them. In the list that we have compiled among the best aquarium heaters available in the market, the prices range from $18.00 do as high as $170. The trick with the cost in aquarium heaters is that you Should buy the best aquarium heater that you can afford. Some titanium heaters cost in the mid-hundreds but the quality and working efficiency are worth every penny.

  • How long should I leave the water heater switched on each day?

Most water heaters are thermostatically controlled. A thermostat is a device that automatically disconnects the supply of electricity to the heating element in case the required amount of heat has already been produced. so that means you don’t have to worry about switching on and off your electric heater throughout the day. The heater does that job for itself. The only time you have to worry about Switching off the heater is when you are changing the water in the tank. There are certain heaters that switch themselves off in case the water level goes down beyond a certain level. But still, it is advisable that you switch off a water heater before you change the water in the tank and do not forget to turn it on after you have cleaned the water.

  • Where do I place the heater in a tank?

Well, first of all not every heater has to be placed inside a tank. There are products like Hydor inline heaters that can be pleased or let’s say that can be tucked away behind the heater so that it does not disturb the aesthetics of the aquarium.

But most of the heaters are kept inside the tank and the placement should be decided on the basis of where the aquarium filters are kept.

What we must consider is that the clean water coming from the fish tank filter must be heated so that there is even distribution of heat throughout the tank. It is also advisable to keep the heater near the filter because many heaters need a constant flow of water to operate.

Also, heaters should be kept as such that they do not obstruct the view of the tank or disturb the fish inside. Or else you might toast your fish inside the water.

  • How many heaters do I need and what size if heater do I need?

The size of the heater is not the physical dimension but its wattage. Watt is the power of the heater. What watt of heater should you use primarily depends upon the size of your tank? The basic idea behind the power of the heater to be used and the size of the tank is that you need 5 watts of power per gallon of water if you have to increase and maintain the temperature of the water at 10°C more than the room temperature. It means you would need 25 watts of power for 5 gallons of the aquarium and so forth.

Now if you have a large tank and one heater at one corner doesn’t seem to cut the job, you can and should use two heaters for even distribution of heat throughout the tank. But keep in mind the total power required by the tank. For example, if you have a large tank and you require a heater if 200 watts, make it two 100 watt heaters rather than one single 200-watt heater at one corner.


Brief summary:

It is advisable to have a fully submersible heater rather than one that is partially submersible. This way it gives you more freedom and versatility for the placement of your heater and also gives you room for manoeuvre when the situation calls for. If your heater is partially submerged you’ll have to put a little weight under it to help draw the cool water up to the heat source.

It is also true that money brings in quality. Many submersible heaters don’t last as long as they should when they are installed horizontally so it is a good idea to get your heater checked or replaced at least once a year. In many heaters the inbuilt thermostat and temperature measurement units and calibrations and not fully trustable so it is advisable to have a separate thermometer. And I said before a higher P does assure you a better quality heater consequently a safe environment for your fish.

Price grading:

Instead of giving you exact price details which do have a great chance of being wrong later on, we will give you a range of prices and grading in terms of price.

The EHIEM Jager features the least expensive heater in our list ranging from $18 to $24.

The  Aqueon Pro falls almost in the same range.

The Hydor In-line comes in third with a $35 to $40 range.

It is followed by  Fluvan e line series at $35 to $47

Our editors pick, Cobalt aquatics ranges from $56 at 25 watts fir 6 gallons to $116 for 300 watts for 100 gallons.

The JBJ heaters are the most expensive ones featured in our list ranging from $ 55 to $164 depending upon the wattage and capacity to heat a certain volume of water.

So many times we get caught up in the details about aquariums, like size, build quality, fish, tank mates, and plants that we often overlook the importance of something invisible and non-materialistic like temperature maintaining a constant temperature and choosing the right temperature for your fish is very important for them to have a long and healthy life. It also should mimic the real environment that they grow in the wild. For that, a heater for your aquarium becomes very essential. And choosing heater properly fits your needs but also doesn’t burn a hole in your pocket become super necessary. So, peeps, keep reading, keep. Learning and keep making sound decisions. Until next time, I will have to ask your leave.

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