Heaters are one of the most important devices to be put inside aquariums.
Keeping the temperature appropriate for the fish is necessary for their survival since they do not produce heat from their bodies.
This buying guide for aquarium heaters contains all sorts of information to help you find the best heater for your aquarium.
There are a number of types that aquarium heaters can be divided into: substrate, filter, submersible, and immersible heaters.
- Substrate Heaters: These heaters work by warming the water from the bottom of the tank and moving upward. As such, they are set up in the ground of the aquarium within the material used (gravel, sand, rocks). Substrate heaters are known for being reliable temperature regulators. As they are hidden at the bottom, they are a good choice if the aquarium has living plants.
- Filter Heaters: Filter heaters are the latest in the type of heaters now available in the market. They contain blocks inside the filter which provide heating as water is being cleaned, keeping the water at a steady temperature. Filter heaters can be more expensive than others.
- Submersible/Immersible: As suggested by the name, these heaters can either be fully or partially submerged inside the water. These are usually of the cheaper variety and serve well for those who want to have a backup heater. Immersible heaters can be completely immersed, which makes them the most difficult to hide. A possible issue with these heaters is that they only heat a certain part of the tank, so if the water is not circulating on its own, the heating will not be sufficient.
An important thing to consider when purchasing an aquarium heater is to see the power it is providing.
This can be checked by looking at how many watts it is offering.
Choosing an Aquarium Heater
Benefits of Aquarium Heaters
These heaters are essential for fish and live plants within the aquarium.
Even if the tank is placed in room temperature with room-temperature water, there is no confirmation that the water will stay that way.
Some fish also require a different kind of temperature, which might be higher than room temperature.
In such cases, a heater is as necessary as the water inside the tank.
Heaters also make sure that the fish do not die because the temperature keeps changing.
Apart from heating the tank, heaters also regulate the temperature and keep it consistent.
Types of Heater Materials
Heaters are made from a number of materials that add to their durability and overall performance.
However, these materials can also make the heater vulnerable to damage or leakages that can be hazardous for the fish inside the tanks.
Here are some materials that are used to make aquarium heaters:
1. Glass Tube Heaters
A lot of heaters are made using glass, especially in the form of quartz which is a sturdy material.
Some glass heaters come with clamps or cups that are used to suspend them inside the tank if they are submersible.
The glass generally is used to surround the heating component and the thermostat in order to provide a protective layer that keeps the water away from electronic materials.
Using high-quality glass ensures that there are no leaks inside the aquarium or harm caused to the fish through electric charges.
There are certain advantages to using glass tube heaters.
They are economical, come with a built-in thermostat and are available in varying power and sizes.
However, there is always a chance of breakage since it is glass, and some heaters may even have faulty thermostats.
2. Titanium Heaters
These are commonly used when heating aquariums with coral reefs.
Some of the high-quality titanium heaters are equipped with a temperature probe as well as a controller for checking and manipulating the temperature of the water.
When the required temperature is achieved, the power is switched off via the controller.
Some problems with titanium heaters are that they can be more expensive in comparison with other types, they tend to get too hot, sometimes melting the acrylic, and they are more suited to sumps than displayed aquariums.
Still, these heaters are extremely durable, are equipped with a controller and are completely submersible.
3. Electronic Heaters
Relatively recent, electronic heaters come with an electric thermostat which provides better readings.
They are gaining a lot of support and positive feedback from users and are, thus, being used by an increasing number of people.
The advantages that they bring apart from perfectly accurate temperature readings are their small size and LED temperature presentation.
The disadvantages include cost (they are significantly more expensive than glass heaters) and currently, the choices in electronic heaters are very limited.
4. Inline Heaters
These heaters are quite unique because they are placed outside the tank. They function by pushing water from the tank into a canister filter and then back into the tank.
The pipe or tube that sends water back is lined with a heating mechanism.
With inline heaters, there is no threat to the fish caused by breaks or leaks and they can switch off automatically once there is no water being brought to them.
Unfortunately, they must always remain vertical or else they won’t work.
Furthermore, the size of their pipes limits the efficiency of warming water and their speed cannot be altered.
The following is a collection of the top 10 heaters available on Amazon.
Top 3 Recommendations
1. Eheim Jager Aquarium Thermostat Heater
- Fully submersible
- Thermo safey control protects against running dry
- Will automatically turn off when water level dips too low
- TruTemp dial recalibrates the heater for precise temperature regulation
- Made of shock resistant and shatter proof glass for fresh or marine water
- On/Off indicator light for at-a-glance monitoring
With the widest range of power in this list, the Eheim Jager heather can cater to a lot more aquariums than any other heater.
Temperature is adjusted and automatically recalibrated to ensure accuracy, can turn off itself at lower water levels, and comes with safety controls to prevent dryness.
The heater is to be submersed fully and has shockproof and shatter-resistance glass that keeps the fish safe as well as a light for keeping an eye on the tank’s condition.
- The variety in sizes and powers makes the product more accessible
- Strong, durable material is used to construct it
- Automatic controls remove pressure from everyone to always be available for it
- Temperature rises without prompt, endangering the fish
- Lack of manual control brings up issues with adjustability
2. Aqueon Pro Adjustable Heater
- Adjustable heat setting 68 to 88°F, Electronic Thermostat accurate to +/- 1°
- Shatterproof and nearly indestructible
- Fully submersible; Auto Shut-Off when over-heats, resets when it cools down
- LED light is always on: red when heating, green when not heating
- Limited Lifetime warranty
This is another one of Aqueon’s submersible heaters that carry similar features to its sister models.
Power and sizes range from 50W to 250W with temperature-adjusting technology (68 to 88 degrees Fahrenheit).
A new addition to this product is the improved accuracy of its thermostat by one degree.
It also has an LED light that indicates with red and green colors when the heating is on and when it has been automatically switched off.
The product is said to be shatterproof which is important for the safety of the fish.
- Lifetime warranty provides security to the customer
- Advanced heating technology that adjusts itself automatically
- Range of power works well for a large set of aquariums that vary in sizes and volumes
- Has malfunctions that can be life-threatening to fish
- Inconsistent performance overall
3. Tetra HT Submersible Aquarium Heater
- All Tetra HT heaters have indicator lights to let you know when the heater is on. It will be red when heating and green when the proper temperature has been reached.
- The HT10 uses a built in electronic theromstat to automatically maintain water at 78° F which is ideal for most tropical fish. No adjustment is requried.
- Ideal for aquariums between 2 to 10 gallons with hoods or glass canopies
- The HT heater is fully submersbile and can be installed vertically or horizontally. It's small footprint makes it easy to conceal behind plants or other décor.
- Please read all label information upon delivery. DO NOT plug heater into an electrical outlet until it is placed inside the aquarium.
This product comes with an electronic thermostat with indicating lights (red and green) that will show the condition of the tank.
This heater is recommended for glass aquariums carrying between 2 and 10 gallons of water.
It can be installed easily anywhere in the tank as it can be hidden due to its compact size.
Due to its convenient size, the Tetra HT is the most bought aquarium heater on Amazon.
- Compact and easy to set up
- Designed expertly with an electronic thermostat
- Does not require a lot of maintenance
- Does not let temperature to be adjusted manually
- There are reports of temperature malfunctioning, nearly killing the invertebrates
4. Aqueon Preset Heater
- Preset to 78°, accurate to +/- 1°
- No adjustment required
- Shatter resistant
- Auto shut-off
- LED light turns on when aquarium water is being heated
This is a submersible heater that comes in varying sizes and powers (50W, 100W, 150W, 200W).
It is preset to 78 degrees Fahrenheit which is recognized as the ideal temperature for most fish.
It comes with automatic settings to shut off after detecting a high temperature.
These sensors are installed to make sure the tank does not overheat and compromise the fish.
The heater is also shatter-resistant and comes with an LED light and a year-long warranty.
- Shatter resistance makes the product durable
- Variety of power and size accommodates both small and large tanks
- Temperature settings cannot be changed from 78 degrees Fahrenheit
- Heating may not be effective in some cases
5. Aqueon Submersible Aquarium Heater
- Precise temperature setting to 1-degree F (68-88 degrees F)
- Recommended for aquariums up to 20- Gallons
- Shatter-resistant construction, fully submersible
- LED light turns on when aquarium water is being heated; Automatic safety shut off and overheat protection
- Lifetime Limited Warranty
Equipped with some of the features also found in the Preset Heater, this submersible heater comes in more sizes and powers (starting from 50W and going all the way to 300W).
One of the key differences from the Preset Heater is that this one comes with upgraded temperature preset technology, which allows up to 1 degree change.
It also comes with a lifetime warranty, although it is limited.
- Temperature setting upgrade gives user control
- Variety in sizes and powers increased
- Warranty provides security
- Compact sizes make for easier fitting inside the tank
- Many reported malfunctions that include burning out
6. U-Picks Aquarium Heater
- UPGRADED VERSION FOR CONTINUOUS WORKING: U-picks keeps improving best aquarium heater for your fish tank, after collecting so many comments from customers, we upgrade its function and life time, now it works more continuously and accurately.
- MORE SAFETY & HIGH QUALITY: This upgraded aquarium heater now updated for more durable Quartz Glass, which is pretty shatter-proof and blast-proof and prevents electricity leakage. And the stronger protective container updated for Anti-melting double sealed material, it is scald-preventing for your pets and your safety.
- A HEATER WITH ONE FREE THERMOMETER: This fish tank heater come with an extra thermometer to show the accurate tank temperature to avoid overheat or freeze. It provide a constant warm environment for your pet fish to stay healthy, suitable both for fresh and salt water.
- TEMPERATURE CONTROL: U-picks Aquarium heater works in intermittent operation mode and will automatically turn on/off to achieve the setting temperature constantly and stably. Setting the temperature by the pink button on the top with range is 68°F - 94°F.
- TANK CAPACITY: Our submersible aquarium heaters are perfect designed for different size tank, from 3 gal to 80 Gal, please choose the suitable power for your tank. And we also recommend to position it near a strong water flow, the outlet of a power filter is ideal, so that the whole aquarium are in the same temperature.
The U-Picks heater comes with a wide array of exciting features.
The temperature can be controlled from the buttons on top of the heater within a range of 68-94 degrees Fahrenheit.
It also maintains itself automatically.
The heater is protected by double-sealed quartz glass to make it safe for the fish and during the installation process.
The heater is also created to ensure electric shock safety.
Some precautions are given with the product.
- Safe to use
- More control to user to determine temperature
- Quartz glass is a good addition to the product
- Temperature does not always remain at the prescribed setting
- Requires to be put near an area with circulation or else it will not work efficiently
7. FLUVAL E 300-Watt Advanced Electronic Heater
- Dual temperature sensors provide accurate and real time water temperatures
- LCD temperature display available in both Fahrenheit and Celsius; Range of 68 to 93 degrees Fahrenheit
- Fast heat technology built with a safety shut-off; Integrated fish guard to protect fish and invertebrates
- Equipped with a slim profile mounting bracket; Colored display alert system
- Suitable for aquariums up to 100 gallons; 300 watts; 5 year warranty
- Check out user manual under Product details before using the item.
- The heater is factory calibrated. Variables such as lower room temperature, wide fluctuations, lack of an aquarium cover, presence of submersible pumps and filters, aquarium placement in proximity to cooling sources, may require a higher wattage for proper control. The volumes indicated are approximate values corresponding to water temperatures up to 26°C/78°F with a room temperature of 20°C/68°F. If the ambient temperature is higher than the set temperature of at least 1°C/2°F, or external sources of heat elevate the aquarium temperature more than 1°C/2°F, the LCD display will remain red until conditions change
This heater involves dual temperature sensors, LED temperature display in both Fahrenheit and Celsius, and advanced warming technology that comes with fish protection.
The thermometer settings allow a range of 68 to 93 degrees Fahrenheit.
It also comes with a mounting bracket alert system.
The heater comes with a great warranty of 5 years, with a manual that details all instructions.
Overall, the temperature settings are quite advanced and sensitive to small changes.
- Temperature technology is susceptible to small changes and informative to the user
- 100W to 300W range in product, making it suitable for different aquarium sizes
- Higher sensitivity to fish
- Well-constructed and durable design
- Multiple malfunctions on the product
- Temperature is not maintained at the prescribed setting
8. Pedy Aquarium Heater 300W
- [365 DAYS FREE REPLACEMENT SERVICE]: PEDY offers you 1 year's free replacement service from the date of purchase. If there is any manufacturing defect in the aquarium heater, please feel free to contact our customer support team for a new replacement item.
- [300W TITANIUM AQUARIUM HEATER]: PEDY submersible aquarium heaters using high heat transfer efficiency of titanium alloy, making the heating time shorter. 300W is perfect for 50-60 gallon large aquariums with heating temperature range 68 to 93°F. (Applicable at room temperature 64.4-75.2°F)
- [TITANIUM & TEFLON MATERIAL]: PEDY aquarium heaters made of high quality Titanium Alloy, double seal material and Insulation Teflon, providing explosion-proof, shatterproof, IP68 waterproof, scald-preventing and safe operation for you and your pets.
- [SHATTERPROOF & ANTI-CORROSION]: PEDY aquarium tank heater with amazing shatter-resistant construction, this titanium fully submersible aquarium heater is Anti-corrosion whether in saltwater or freshwater.
- [OVER-TEMPERATURE PROTECTION]: PEDY fish aquarium heater with automatically shut-off the power to avoid overheating and damage, keeping your pet fish healthy in time.
This heater by Pedy is one of the highest rated aquarium heaters on Amazon.
It is made from titanium, which ensures that it is durable. It is submersible and equipped with LED temperature viewing along with an electric thermostat heater.
Additionally, it has been made shatterproof and anti-corrosive.
These features together have made this heater a success in the market.
- Smart heater that will shut off once the temperature reaches heights
- Relatively cheaper than its competitors, providing similar features
- Made from durable and study materials
- Much more accurate readings than other thermometers
- Makes a lot of noise when plugged in
9. Zoohi Submersible Aquarium Heater
- Aquarium Heater Specification: 300 watts, 110 L/H flow water, Volt 110~120v, Freq: 50/60Hz for US/CA.
- Fish Tank Heater Attention: Please take the heater into water before turning on , DO NOT power on until the heater is completely submerged in the water.
- Tank Heater Capacity: 300 watts Used Tank up to 80 Gallons, the size need more than 17 inch. Temperature adjustable of between 68F - 94F.
- Aquarium Technology: Mechanical heat technology built with a safety shut-off, Integrated fish guard to protect fish and invertebrates.
- Note: Please Make sure heater is de-energized and cool before take out of water. It is recommended to cool in the water for 15 minutes . 12 months warranty period.
Zoohi’s heater comes with a sophisticated heating system: 300W, 50-60 Hz, 110-120V and 110 L/H flow of water.
This alone makes it stand out among its competitors.
It carries guard systems for the fish as well as a manual shutting off option for the tank.
The temperature is adjustable between 68 and 94 degrees Fahrenheit, with a capacity of 80 gallons being warmed by 300W.
The heater must only be used when fully set underwater.
- Warranty of 1 year
- Strong suction cups to hold the glass to the side
- A sturdy, durable design and construction
- Appropriate safety equipment on heater
- Water made vulnerable to electricity in one case, posing a serious health risk
10. Uniclife HT-6050 Aquarium Heater
- Wide Application: HT-6050 heater is suitable for most tropical freshwater and marine aquariums which volumes from 5 to 15 gallons. A heater is a fish tank set up necessity if you have tropical fish.
- Easy Adjustment: A visible temperature is displayed on the upper of heater, allowing you to precisely control the temperature. A rotary knob on top to adjust temperatures that range from 68°F to 93°F (20°C - 34°C). A good range for most fish is 76° to 80°F (25- 27°C).
- Fully Submersible: Water-tight sealing IP68 waterproof design, Strong suction cup clamps tightly fix the heater to the tank vertically. The Red indicator light on while working
- Explosion Proof: 2 mm extra thick Quartz Glass is shatterproof and prevents electricity leakage. The heater is protected with shockproof soft package material in case of unexpected damage during transportation. 1 Year Blast-proof Replacement Warranty. Measures 8.6" x 1.2" (L x D).
- Stick-on Thermometer: Simple to read and easy to attach (just peel and stick), Measures 5.2" by 0.7" and measurement range is 64°F - 93°F. With color indication design, the water temperature that the thermometer reads will change from white to blue.
This heater only comes in a small size, with a power of 50W which is ideal for small aquariums.
It works well with most freshwater and tropical aquariums no larger than 15 gallons.
The surrounding quartz glass makes the heater shatter-proof, protecting the tank and its inhabitants from being poisoned and electric shocks.
The heater also comes with a stick-on thermometer and a knob on top for adjustment, offering users greater control.
It is a submersible heater with strong cups to support it underwater.
- Advanced design to provide proofing from leakage and damage
- Adjustable temperature offers users more control
- Temperature is easy to read
- Suitable for a wide variety of fish types
- None identified
Other Aquarium Heater Tips
There are many other heaters out there that can provide customers with what they need for their aquariums.
Sometimes, what they require is something specific, such as higher temperatures for tropical fish.
There is more to picking out an aquarium heater than selecting the most advanced and best-reviewed one.
Other factors to consider include the following:
Type of Heater
This refers to whether a heater is submersible, substrate or filter.
All three are built for use in a certain way, so there needs to be some care and research involved when picking out a heater.
Most heaters offer a different power for heating than some of their counterparts.
This can also be determined by their sizes (small = less power).
The best way to figure this out is to check your aquarium, which usually indicates what power heater is ideal for it.
If not, an aquarium’s capacity can be used to check which heater is the best for use.
You need to calculate how much you are willing to spend on a heater.
This will require creating a budget that you need to stick to if you are saving up for one.
This does not have to be difficult.
With a little bit of research on the tank size appropriate for reasonably priced heaters, you can find yourself a good deal.
Type of Aquarium
After buying the heater, you need to choose an aquarium that suits the heater, although purchasing a heater that covers heating for multiple water types and animals is always the best situation to be in.
Choices in aquariums include saltwater, freshwater, betta, reef and turtle tanks among others.
For convenience, it is always best to pick heaters that are the easiest to clean and replace when broken.
The best ones are those that, despite breaking, will not harm the inhabitants of the tank and can be taken out without posing a risk to anyone.
Where to Install the Heater
While this is not a complicated question to answer, it is important to take note that most heaters need to be placed somewhat strategically near a circulatory device that keeps the water in the tank flowing.
This way, the heat can warm up all the water in the aquarium.
If not, the heater might not be effective at providing the necessary warmth for the fish.
How to Set It Up
As updated technology is incorporated into aquarium heaters, setting them up is now easier than it might have been before.
There might be specific steps to follow for a select few, but most heaters can be set up by following these steps:
- Take your time examining the heater and checking for any leaks or damage. Check the packaging and case to ensure there is nothing inside to deem the product unsafe for use. For example, there should be no wires exposed.
- Locate the area where you can install the heater. Make sure it is in contact with circulating water for best results and that the nearby glass is clean.
- If your heater is submersible, attach it inside the tank using the suction cups that come with the product. Finalize its position and setting and place all contents such as toys or flora away from the heater.
- Once the heater is attached, let it stay inside the aquarium for half an hour with the water. This is recommended to ensure that there are no leaks from the heater when switched on as the heater can adjust to its surrounding temperature and setting.
- Before switching on the heater, take a reading of the water, even if it is at room temperature. This is done to ensure accuracy when measuring the temperature rise. Also, adjust the settings on the heater before it is turned on.
- Once the heater has been on for around 24 hours, take the thermometer and dip it in the farthest corner from the heater to see if it is working. You will notice a rise in temperature if it is. (These thermometers come with the product in most cases).
- Keep checking the heater every few hours to see whether the temperature is regulated consistently.
- If the results are positive, add your fish. The reason the fish are added later after the temperature has been regulated is for their health. They might become agitated and unwell because of the fluctuations in the temperature.
Since heaters must remain on for the entire day, it is essential to look at how much power they are consuming.
Larger tanks and tropical aquariums will require more power in comparison with small ones.
Thus, more electricity will be used to provide more heat.
Although it is quite difficult to determine how much the electricity bill would be, a rough estimate along the lines of the power usage can be calculated by using the following information.
A tank with 30 gallons of water that is heated at the standard temperatures which aquariums normally demand (around 72°F or 22°C) will end up consuming about 110 kWh.
However, if the same amount of water needs to be warmed up to 82°F or 28°C, the power usage will be something around 440 kWh.
This means that with only a minute increase, the power consumption will quadruple.
Even though this is not completely accurate, it is a good estimate as to how much electricity aquariums require to function efficiently.
By using the size of the aquarium tank and the temperatures provided above for comparison, the power usage trends can be determined.
Aquarium Heater Frequently Asked Questions
This section aims to answer a number of questions all aspiring fish owners might have.
The aim of this section is to clarify any further curiosities and confusions you might have before you can begin working on your own equipment.
Generally, aquarium heaters cost something between 18 and 80 US dollars. The price largely depends on the overall quality of the product, which includes efficiency, durability, etc.
All over the world, there are numerous brands that are producing aquarium heaters. In the UK, the brands highly recommended are Tetra, Fluval and Eheim, while in the US, there are many more such as Hagen, Azoo, Rena, and Marineland. Recently, some great heaters are being made in China that are being imported all over the world. However, choosing the best product or brand largely depends on personal choice and preferences more than anything. Brand loyalty developed over years also comes into play here
The simplest explanation of aquarium heaters is this: when connected to a power source, the heaters begin producing heat by converting the electrical charge. Aquarium heaters in particular surround the heating object with a material (glass, titanium, etc.), which protects the tank and its inhabitants. The heater also comes with a thermostat that tells the temperature of the water.
The rule with aquarium heaters is that you do not turn them off until they need to be cleaned or replaced with another. Since they come with smart technology that regulate and manage temperature on their own, they need not be disturbed unnecessarily or else the fish might be damaged in the process.
Generally, when you buy an aquarium tank, it comes with a handbook that details all that will be required to set it up. This information also contains the heater and its specific requirements. Essentially, the size of the tank or rather the volume of water it can hold determines which heater will be suitable to use with it.
While some heaters are, others are not. There are inline heaters that are not submersible at all along with some electronic heaters that might only be partially submersible. However, heaters made with titanium and glass are generally considered to be completely submersible.
If you are buying a heater, the chances are that it will most probably come with an LCD or LED screen that will show the temperature inside the tank by glowing. The standard colors that indicate this are red and green, although some heaters use others too. When this light stops glowing, the heater has switched off. This means that the temperature inside the tank is at the set temperature and will only switch on again once it drops past a certain point.
It very much can. If your tank is placed in a cold area, you will need to use a stronger heater that provides more warmth to the water. However, if you place your aquarium in a warm place, you will not need to use a strong heater. This will help you save money on your electricity bill as stronger heaters use more power. As such, a tank without a heater is seriously affected by the lack of appropriate heat.
It depends on the type of plant you are using. Some plants do well in warm temperatures, while others can remain the same in both warm and cold climates. When purchasing plants, you should make sure to ask which temperatures suit which plants to coordinate with your tank’s requirements.
You are suggested not to. Using stronger heaters in smaller tanks can cause overheating very easily and endanger your fish and plants. Stick with the suggested heater size on the tank.
While there are some heaters that have built-in thermometers to tell the temperature, they are not completely accurate. The best way to know the exact temperature of your tank is to use a thermometer to determine it. Simply dip the tip into the water and take it out after a minute. Thermometers are very cheap and easy to use.
There are a number of ways this is achieved, but the underlying principles are exactly the same as with smaller aquarium tanks. First, they are provided with a cover to retain the heat. Then, they are warmed by using up to 800W heaters. Such large heaters are generally made from titanium because of its durability.
Now you know everything there is to know about aquarium heaters and how to manage them.
You also know what type of materials are used in heaters and what they offer individually as well as how to determine a heater is good enough.
You are also aware of some of the best options in heaters available to you and you have also understood how to install one carefully.
Furthermore, you have learned a number of other things regarding aquarium heaters such as electrical outputs and how to get the best value out of them, where and how to place an aquarium with its heater, and why these devices are important.
This extensive knowledge will allow you to make informed choices about the kind of aquarium experience you desire to build for yourself.
From learning about temperature to types of heaters, submersible and otherwise, you can now be responsible for your very own fish tank.