Are you an aquarist or do you have the hobby of keeping aquariums? If yes. Here is some clear and relevant information for you to choose the best aquarium heater for your tank.
As we all know, that pets need a lot of care especially if it is a fish. As a matter of fact, fish cannot regulate their body temperature just like human beings. And so, this is why we feel the demand for aquarium heater.
The situation in this regard is very confusing. For instance, there is a huge variety of aquarium heaters available in the market. Therefore, few important things must be kept in mind before selecting a good aquarium heater to give your fish the ideal environment.
On the other hand, when you love your pet, you are more concerned with their safety and relaxation. Caring for them includes an effective fixed system that functions properly, easy to clean and feasible to maintain.
Our Top Picks
Cobalt Aquatics Flat Neo
Tetra HT Submersible
Best Aquarium Heater
Learning a bit about aquarium heater best to heat a fish tank is important before deciding what to buy and what to avoid. Do you want to learn how to do that? In brief, here are some of them with aquarium heaters reviews:
| AQUARIUM HEATERS | RATING | PRICE |
|---|---|---|
| Tetra HT Submersible Aquarium Heater | ⭐⭐⭐⭐⭐ | |
| Cobalt Aquatics Flat Neo-Thermo Heater | ⭐⭐⭐⭐⭐ | |
| Eheim Jager Aquarium Thermostat Heater | ⭐⭐⭐⭐⭐ | |
| Fluval E Electronic Heater | ⭐⭐⭐⭐⭐ | |
| Aqueon Preset Heater | ⭐⭐⭐⭐ | |
| Orlushy Submersible Aquarium Heater | ⭐⭐⭐⭐⭐ | |
| ViaAqua 300-Watt Heater | ⭐⭐⭐⭐⭐ | |
| Tetra 26445 Fauna Aquatic Reptile Heater | ⭐⭐⭐⭐ | |
| Mylivell Aquarium Heater | ⭐⭐⭐⭐⭐ | |
| Hydor Glass Aquarium Heater | ⭐⭐⭐⭐⭐ | |
| Marineland Precision Heater | ⭐⭐⭐⭐ | |
| ISTA Inline External Heater | ⭐⭐⭐⭐⭐ | |
| Finnex Hang-On Electronic Controller Aquarium Heater | ⭐⭐⭐⭐⭐ | Check Price |
| U-pick Aquarium Heater | ⭐⭐⭐⭐ | |
| JBJ Automatic Top Off Water Level Controller for Aquarium | ⭐⭐⭐ |
Top 15 picks: Let’s start with our aquarium heaters review.
1. Tetra HT Submersible Aquarium Heater (Very Adjustable)
Do you want to buy the most reliable aquarium heater? If yes, then you have caught the right web. Here is the newly designed Tetra HT Submersible Aquarium Heater with electronic thermostat.
Now, why do we choose this Tetra HT Submersible Aquarium Heater when we have a lot of variety in the market? The reason is that it is likeable because of its easy way of use and enough space for ranging from 2 to 25 gallons.
Like all other Tetra aquariums, it also has the red and green indicators for your ease. As the red indicator shows that the heater is heating and the green one shows its standby position.
What makes it special is the low voltage thermostat which maintains water at 78 degree F.
As if that’s not enough!
Let’s see, what else makes it different from other aquarium heaters.
- Maintains ideal temperature for most tropical fish
- Thermostat needs no adjustments
- Automatic shut off safety feature
- Over usage can damage the system
To summarize we are offering the best aquarium heater required for a standardized product. Make a smart choice and continue loving your pets with ease and comfort.
2. Cobalt Aquatics Flat Neo Heater (Shatter resistant glass)
If you are looking for a modern, super-flat design that is fully submersible and energy saving best aquarium heater in the world then this heater is the one.
Besides, you won’t even notice it as an aquarium heater in the first view because of its unique features and stylish design. All these features add beauty to your tank.
Similarly, it includes reversible brackets, which allows heater to face inside as well as outside making it the best heater aquarium.
Imagine! What would it be like to have an aquarium heater that adjusts from 66°F to 96°F according to industry standards? Indeed, it will maintain tank temperature within +0.5°F.
In addition to that, its modern heating system prevents overheating and shuts down automatically when there is no need for heating. It comes with all the needed safety and precautionary features.
And truly, this heater for aquarium comes with a 3 years warranty which indeed shows its durability.
Furthermore, its touch design system allows you to control the fish tank heaters with ease. Plus, it has a small and flat design that works well in a number of different spaces.
Want to know the best part?
We are not through yet! Below are some more points to it.
- Unique and modern design
- One-touch temperature control
- Optimal temperature range between 66°F to 96°F
- LED light indicator
- Not suitable for large aquariums
- Suction cups could be stronger
Finally, buy this modern Cobalt Aquatics Flat Neo-Thermo Heater together with Adjustable Thermostat and add more beauty to your aquarium.
3. Eheim Jager Aquarium Thermostat Heater (For both freshwater and marine water)
All 9 EHEIM Heater models are 100% completely submersible and come with a new TruTemp dial for accurate temperature readings. Thus, they are amazing saltwater aquarium heaters.
Check this out, if you want a high-quality heater for aquarium with many size options and countless safety features.
There are eight size ranges in this underwater heater. This range starts from 25 watts to 300 watts therefore it can lodge from 7 to 150 gallons. As you go up in wattage, the size of the heater increases reaching up to 15 inches which makes it easy to place.
Interestingly, this heater also has a Thermo Safety Control system that stops on removing it from water and resumes when we submerge it again.
Because of the design, we can use this in both freshwater and saltwater aquariums. Therefore, it is considered as one of the best aquarium heater.
Moreover, it is made with shatterproof glass construction. TruTemp fish tank heaters are free of pollutants. They are resistant to chemical and biological substances, and are able to bear extreme temperature changes.
Additionally, their mounting bracket and suction cups are helpful in installation with an extra-long power cord.
But that’s not all!
We have more to it. Keep reading.
- TruTemp dial adjusts from 65 to 93F
- Thermo Safety Shield automatic shuts off
- Available in a number of sizes
- An extra-long power cord
- Shock resistant and shatter proof glass
- Overheating may be expected
- Higher wattages can be long in length
So go and buy this Shatterproof glass aquarium heater for fish tank made with laboratory-grade glass. It is one of the best aquarium heater and you are out of luck if you don’t get these fresh water aquarium heaters which also work in salt water.
4. Fluval E Electronic Heater (Precise Temperature Readings)
Out of all the aquatic heaters, this one has unique features. Adjustments can be made on dual temperature sensor by checking precise reading.
Its temperature range is 68°F to 93°F and comes in three sizes from 100w to 300w. Basically, this aqua heater is made for lower room temperature
Moreover, the instant heat technology and secure shutoff on overheating makes it very unique. Also, there is a guard infused in it that protects fish and other animals.
Besides, this, one of the top rated aquarium heaters is slim in shape so we can easily adjust it in any location. Hence, it does not take too much space. It also has colored display alert system when the water temperature rises or falls below 5.5 °F, the screen flashes.
Based on our experience, the team aquarium heater reviews suggest that this heater for fish tank has dual sensor which provides accurate water temperature.
And guess what?
These Top aquarium heaters has 5 years warranty as well.
- 5 years warranty.
- Suitable for aquariums up to 100 gallons
- LCD real-time temperature display
- Integrated fish guard
- Precise temperature reading
- Slightly expensive
- Takes time in heating
- Setup is a little tricky
Here is the deal, get this underwater heater and make your pet’s life safe and secure.
5. Aqueon Preset Heater (Optimal temperature supplier)
Can you think of what is the best aquarium heater which does not need to adjust the temperature? Yes, you read it right. Aqueon Preset is the most reliable aquarium heater model that requires no adjustments at all. For instance, the temperature of this heater comes with a preset at 78° which is appropriate for most tropical animals.
Moreover this is totally submersible like all other aquarium heaters. Additionally, the shatter resistant glass feature of this product makes it one of its kind.
And if that’s not enough, it also has an LED light display which turns red when it is heating. According to your choice, it can be placed both horizontally and vertically.
We bet you will not miss this opportunity of getting one of the best aquarium heater controller.
Still not convinced?
This safe and secure aquarium heater comes with a 1 year warranty as well. Usually, we recommend you to use 100 watt per 20 to 30 gallons.
- Preset temperature adjusted at 78°
- 1 year warranty
- LED light indicator
- Automatic shut off when overheated
- Pretty decent size.
- Accurate water flow is required for best results
- Heating takes more time
In short, if you are planning to buy the best aquarium heater and have no time to adjust it after every few hours. Then, Aqueon Present Heater is the best option for you. And, this is what we mentioned in this aquarium heater review as well.
6. Orlushy Submersible Aquarium Heater (Shatterproof and Durable)
You may be wondering what’s new in Orlushy heater which makes it stand against the rest of the top aquarium heaters. So, here you get your answer.
Orlushy is a fully submersible heater and comes with an 110V-120V/60HZ battery. Likewise, it has a long power cord which makes it easy to handle.
Another point, it automatically shuts off to stop overheating and saves your fish life.
Moreover, the heater comes in a number of sizes starting from 9 to 11 inches. The 9 inch gallon has 100 watt battery and it works for 15 to 30 gallons. After that, size and battery increases until 11 inches and it can work for more than 70 to 80 gallons of water.
In addition to that, these are considered among the top rated aquarium heaters, made of unbreakable glass which makes it long lasting. The temperature ranges between 68 to 89°F which controls the aquatic climate at adjustable difference.
Oh wait!
Last but not the least it comes with a free thermometer to check the temperature properly.
- Comes in number of sizes.
- Unbreakable glass.
- Accurate temperature adjustment.
- Modern sleek design.
- Brightly colored adjustment knob.
- Less effective for more than 80 gallons
- Suction cups could be stronger
If you are looking for different size ranges in best heater aquarium then Orlushy Submersible is the right option for you.
7. ViaAqua 300-Watt Heater (Easy to install)
Via Aqua fish tank heater is our high quality aquarium heater which is made of unbreakable quartz glass.
Additionally, a built-in thermometer helps in checking the temperature easily. It keeps the aquarium at a normal temperature.
The Suction Cups are also available for securing it to the aquarium. And surprisingly, there are no big fluctuations that occur from automatic turning on and off.
Moreover, The 300 Watt model can heat water in 80 gallons tank as well as a 100 gallons tank without any issues.
Like other aquarium heaters, this one is also submersible and its unique feature is that it comes with a very simple installation process.
Also, the tank stays stable at 77-78F without any problem even when ambient temperatures are in mid to high 60s.
Surprise!
This heater for aquarium comes in a number of sizes and it can work in both fresh and salt water.
- High quality
- Sleek design
- Long lasting quartz glass construction
- Adjustment knob makes it easy to turn
- Red light indicator shows then it is working
- Short power cord
- Sometimes hard to read degree markings
Let’s face it; everybody wants quality and ease for themselves. And, this ViaAqua Quartz glass, one of the most reliable aquarium heater provides you both. So, go and buy it for yourself.
8. Tetra 26445 Fauna Aquatic Reptile Heater (Affordable and Reliable)
The Tetra Fauna is known for being best aquarium heater specifically for reptiles including Frogs, Newts and Turtles.
The best thing about this heater is; it’s for reptiles which require more heat to meet their needs. This aquatic compact heater comes with a battery of 100 watt. And the temperature is set at 78 degree for the safety of your pets.
It comes with an extra-long 8 foot cord, why? Because large aquariums require large cords to make its adjustments at any place easily.
But now!
You must be wondering how this is going to stay in place with animals like frogs and turtles? Here is the best part, this ultra tech best fish tank heater has two oversized suction cups which provides maximum grip and prevents any movement by reptiles.
And if that’s not enough, it has a protective plastic cage to prevent breakage. Similarly, this plastic cage has an opening so that the cord can be set at any direction.
- Specifically made for reptiles
- Appropriate for up to 30 gallons of water
- 2 over sized suction cups
- Good price
- Not suitable for less than 10 gallons
- Rarely switches off
In the end, our aquarium heaters review conclude that this special compact heater for aquarium is for all reptile lovers. So, get your hand on this amazing heater and make your reptiles happy and cozy.
9. Mylivell Aquarium Heater (Self-regulating thermostat)
Are you tired of buying an aquarium heater every month? If yes, then you don’t need to worry any more.
Our Mylivell is one of the best aquarium heater that you need in your life. Because it is the best quality fish tank heater, we can bet on that.
Our aquarium heater review team has find out that quartz glass with double cover material is proof of finest quality. Similarly, it’s unique and advanced design fully meets the customer expectations.
Indeed, this heater provides automatic temperature adjustment to give your pets a healthy habitat. The temperature ranges between 65 to 95 degrees with easy to read display.
Moreover, this heater is also submersible with a power of 100W for almost 20 gallons water. In addition to that, these top rated aquarium heaters have two suction cups for tight and safe attachment to the fish tank.
Luckily!
It also has a polarized plug to keep it safe from electrical shocks and ensures safe operations.
- Convenient and Safe
- High quality
- 2 suction cups
- Very easy setup
- Automatic temperature adjustment
- Innovative design
- Do not use with low quality glass aquarium
- Small cord
So, get your hands on this. It is a high quality; double coated, and auto temperature adjustable fish tank heater. After all, quality is what matters the most.
10. Hydor Glass Aquarium Heater (Shock resistant technology)
Hydor Glass has all the needed features that are important for safe and precise temperature maintenance of the water in your tank.
Above all, these aquarium heaters are submersible with shock guarded wires. And thus, provides both horizontal and vertical positioning for comfort of the customer.
Additionally, these heaters have advance PTC technology which makes it unbreakable even if it runs out of the tank.
All the features for a safe and accurate temperature control are available in these heaters for fish tanks.
And you know what? This is the first-ever shatter proof heater with shock resistant technology. Also consists of a graduated scale for maintenance of set temperature.
Indeed!
It is aquarium heater best in regard of its unique feature for not getting damaged in case water level drops.
- First-ever shatter proof heater
- Shock resistant
- Graduated scale
- High quality
- Advance features
- No damage issue on low water level
- Temperature is not consistent
- Sometimes issues with auto shut off
- Fluctuating temperature
Surely, the exclusive technology and the high quality of the components make it a long lasting product. So, go and get the top aquarium heater.
11. Marineland Precision Heater for Saltwater or Freshwater Aquariums (Easy temperature Adjustment)
There are three things which you should look for in aquarium heaters. That is temperature adjustment, heating element and a good and secure heating system. Luckily, they are all available in this heater.
Besides, this fish tank heater combines an adjustable temperature dial and display with advance heating system. In turn, it keeps ideal temperature for fresh water and salt water fish.
Moreover, with its advanced mounting brackets, it provides three window positions to view the temperature display easily. This Marineland Precision Heater serves the purpose of more safety with little risk.
Its automatic thermal switch turns off when it reaches suitable temperature and switches on again if water cools down. Thus, makes it eco- friendly as well as safer for your fish.
Basically, this heater is made for large gallons and works for up to 55 gallons. Similarly, it has a battery of 200W that is very suitable for large containers.
Furthermore..?
Another feature of this good aquarium heater is the advanced heating element. Thus, this includes a mica core surrounded by a mesh warming component that allows heat transfer with durability.
- Durable
- 1 year warranty
- Works for more than 50 gallons
- Automatic temperature adjustment
- Shock protection
- 200W battery
- Water may breach the heater barely
- May not work in extra-large gallons
So, stop thinking and get yourself a Marineland Precision heater for fish tanks that have adjustable temperature and work for large gallons. The 200W battery adds to its worth. So go and buy this best aquarium heater for your tank.
12. ISTA Inline External Heater (High quality with exterior settings)
Of course, you are in the right place if you needed the best external aquarium heater of 2020. Leave your worries and get this outstanding ISTA Inline External Heater.
Let me tell you more about this fish tank heater. ISTA inline external heater ranges from 150W to 500W in size weighing 14.9 ounces and with 12/16mm hose.
Best of all, its thermal spraying glass speeds up the heating process and has high performance. Moreover, it has an external design and is very easy to install.
Additionally, the big advantage is that the heater does not occupy space in the tank.
But wait!
These fish tank heaters have two sensors to examine the temperature of water inlet and outlet with auto power off safety system when temperature is over 36C.
You see, the ISTA external aquarium heater is completely safe and UL listed. There is no risk of damage if it is left running dry for short periods as it will automatically switch off itself.
One special thing about the heater is that it can be used in freshwater and marine water aquariums.
- For external use
- Has 2 sensors
- High efficiency
- Automatic power safety
- For use in freshwater and marine aquariums
- May not give warranty on overall product
- For indoor use only
To conclude, this heater for aquarium is so far the best one with almost all the qualities: efficient, reliable, automatic, etc. Make a smart choice and go for The ISTA External heater only.
13. Finnex Hang-On Electronic Controller Aquarium Heater (Very reliable)
Are you sad with the performance of your aquarium heater and looking for best aquariums in the world with heater? If yes, then the Finnex Hang-On Electronic Controller is perfect heater for tank with titanium tube is what you need.
Moreover, the heater has a weight of 14.4 Ounces and a size of 500W. On the other hand, it is safe and causes no damage at all.
Besides, these heaters for aquariums maintain water temperature within +/-2F of set value. As a result, it provides a safe, healthy and stable temperature for your fish.
Following that, the titanium tubes are corrosion resistant which makes these seemingly unbreakable for both saltwater and freshwater aquariums.
In addition to that:
The ultra-fast heating tubes are easy to hide as they are compact in size. It also includes a precise electronic control with hang on hook that makes it the best aquarium heater.
And lastly, there is also a LED Heating indicator to let you know when the heater is working.
- Equipped with LED Heating indicator
- Has titanium tube
- With sleek analog controller
- Precise temperature control
- Easily adjustable
- The thermostat may fail if used carelessly
Don’t delay, get up and buy Finnex Hang-On Electronic Controller Aquarium Heater which is affordable and perfect. Show love and care to your fish by getting Finnex Hang-On Electronic Controller.
14. U-pick Aquarium Heater (With supplementary thermometer)
Here, we are introducing one of the top aquarium heaters. Those, who do not have any experience of aquarium heaters are lucky to read this review.
Firstly, the U-pick aquarium heater with an extra thermometer is submersible and has adjustable temperature. In fact, it is available in 25W and 300W size for 1 gallon to 40 gallon tanks.
Moreover, this heater for fish tanks is made of durable Quartz Glass which is shatter and blast-proof. As a result, it prevents leakage of electricity.
Best of all, this heater has a strong protective container updated for anti-melting thus proving to be scald-preventing for your pets and their safety.
Besides, the extra thermometer shows accurate tank temperature so this has all that we can find in a reliable aquarium heater.
And it does not stop here!
This heater comes with a precise censor that ensures accurate temperature. As a result, it will stop working if the outside temperature is over 34C. Suction cup allows flexible installation making them the best aquarium heaters ever.
- Equipped with explosion-proof quartz glass
- Can be used for seawater and freshwater
- Adjustable temperature
- Fully submersible
- Energy saving
- The product may not have warranty
We guarantee that you will not find an aquarium heater with these many qualities. If you need a heater to keep your fish tank in a stable temperature then buy U-pick aquarium heater to help your fish. And keep them away from stress and diseases by providing them proper temperature.
15. JBJ Automatic Top Off Water Level Controller for Aquarium (Automatic refilling)
Imagine your dream of buying a professional level fish tank heater has become a truth. Our JBP heater is a professional grade product that automatically refills evaporated water with one pound weight.
Further, it is an all in one heater which is a dream that come true. Best of all, the all in one ATO device is the most advance water level controller system in the market.
Hold on!
An important point, this best fish tank heater is equipped with two float sensors that are activated in seconds when your water level drops. It automatically refills your sump or tank to reach your set point.
Lastly, the electronic controller in the heater allows for two modes of operation with a total of three different set up scenarios.
- Automatic refilling evaporated water system
- Accurate temperature
- Equipped with two float sensors
- Professional grade product
- Reliable
- May leak electric current if not used properly
In conclusion, make a reliable choice by opting for JBJ Automatic Top off Water Level Controller for Aquarium. It provides comfortable life to your fish so that you and your pet are at ease.
Public Choice:
If you are wondering which aquarium heater is most liked by people, below is the result based on our research.
Buyer’s Guide
Choosing the best aquarium heater may not be an easy task at all so we have to keep in view the technical features required when we choose the right heater.
The market offers a wide variety of aquarium heaters which gives the buyer to go for the best option that will be according to their needs.
Even though cost and efficiency are the main factors but other important aspects such as the battery of heater, temperature control system within the tank and its performance are most important to consider among others.
This guide targets to equip the buyer with all the necessary information that they require when it comes to making this decision.
Safety features provided by the heater
The fish tank heaters must provide safety features especially where involvement is of pets. The heater should also have a system that can shut them down in case of overheating.
When we do not handle aquarium heaters well, they can pose a risk of electric shock or even cause fire. Therefore, shock proof cord should be the first priority in the making of aquarium heaters.
Heater Type
The first thing to keep in mind is the best heater that is suitable for your aquarium. However, there are numerous types of heaters but here we have only five main types.
- Saltwater aquarium heaters
- Freshwater aquarium heaters
- Turtle tanks heater
- Betta tanks heater
- Reef tanks heater
You will need to think of the heating area that will be covered by the heater which is the tank size. You can check this by wattage rating of the aquarium heaters.
Normally, 110kWh of energy is the requisite for a size of 30-gallon tank at heating temperature 72F or 22 degree. Similarly, if it heats at 82F or 28 degree C, it will consume about 440 kWh per year, which is 4 times as much.
It is also possible to find models that will work for various types of aquariums. A flexible option is always going to be a good choice.
Energy-Efficiency
If you want to save energy and preserve low costs of heating, it is sensible to look into saving energy before making a choice of aquarium. A lot of aquarium heaters conserve a lot of energy. Therefore, always choose a heater according to your tank size.
Also, check the special added features such as adjustable thermostats, energy saving modes, and automatic shutoff that pay to reduce bills and support in low power usage.
Important Features to Consider while Buying an Aquarium Heater (What is the best aquarium heater?):
Auto Shut OffAn Auto Shut-Off is a protection feature that most heaters for aquarium come with. The Auto Shut-Off feature helps avoid overheating of water tank.
Consequently, it shutoff automatically when it reaches the desired temperature to avoid causing any damage to the living specie. The auto shut-off heaters are the best when it comes to shock security.
Power Cord LengthThe length of the power cord is an important consideration depending on how far the switch is from the aquarium. The length of the power cord is a significant concern. The advantage of a longer cord is to manage it safely because we place the fish tank heater in water therefore short cord may be difficult to operate, unless the cords are shock proof.
ThermostatThermostats, however it may not be available in some aquarium heaters, but it allow the unit to maintain the set temperature.
LED Light IndicatorLED light indicators are available in most of the aquarium heaters, it turns red when heater is working and turns green when it reaches the set temperature.
Suction CupsSuction cups are there for tight and safe attachment to fish tank base. Importantly, strong suction cups are a must for turtle tanks.
Kinds of Aquarium Heaters
Normally, fish tank heaters come in four varieties and you can get to know about the type of heater by reading aquarium heater reviews above.
1. Immersible Heaters:
They are submerged in water but hang along the side of the tank and water line is marked which water shouldn’t touch.
2. Submersible Heaters:
They are the most popular because they can be fully submerged. And can do great as salt water heaters.
3. Substrate Heaters:
They are kept under water in tank bottom.
4. Filter Heaters:
Are built-in heaters being useful in combination with tank filter? The water is given heat as it goes through the filter.
How to Install Aquarium Heater?
- There are few variation in installation among different types of underwater heater but usually the procedure is almost same.
- Always check heater before installing, there can be damaged product or exposed wires.
- Select an appropriate location for installation of aquarium.
- Clean glass surface.
- Attach the heater to the tank with the help of suction cups. Make sure any decoration is not in contact with the heater.
- Let the heater rest in water for almost 15 to 20 minutes before turning it on. This step is to adjust the covering with surrounding water temperature and prevent cracking.
- Place a thermometer on another corner, away from the heater, (if your heater does not come with a thermometer to read the water temperature). Read the initial reading of your aquarium water.
- Now, turn on the heater to adjust its temperature accordingly.
Conclusion:
Finding a heater for your aquarium can be a difficult task. So, always understand your needs in terms of shape, size, style, and power. That way you’ll understand which model you should have.
Just remember that your pet’s lifestyle will dictate the heater you choose, therefore you consider everything before going for a purchase.
Our favorite is Fluval E Electronic Heater- Precise Temperature Readings
Some commonly asked questions are explained below:
1: Are Aquarium Heaters safe?
With proper precaution, fish tanks are safe. Unplug the heater 30 minutes before changing water. Low water level has risk of glass cracking and harming the fish.
2: Where heater should be placed in aquarium?
Place your heater close to filter so that water circulation makes even heat distribution. Submersible should be installed near bottom.
3: Can fish get burned by heater?
It’s quite rare for fish to be burned even if a fish gets trapped in the aquarium wall, the best fish tank heater guard will prevent accidents.
4: How long does it take for a heater to heat a fish tank?
It takes almost 24 hours, but for best results fills the tank with Luke-warm water.
5: Do I leave my fish tank heater on?
Yes, leave heater on 24/7. Heaters have internal thermostat which automatically adjust the temperature.