Choose saltwater aquarium heaterChoosing the best saltwater aquarium heater out of the hundreds of options can be challenging as there are many aquarium heaters available in the market. Aquarium heaters are one of the most essential and delicate pieces of equipment you can add to your aquarium.

That is why it is vital to select a well-built saltwater tank heater carefully that warms your aquarium safely. And to help you with that, we have compiled a list of the best options to help you make the right choice.

Comparison Chart

Product Power Consumption

(in Watts)

Cobalt Aquatics Flat Heater

25 Glass
Eheim Jager Heater

25-300 Glass
Finnex HPC Digital Heater

200 Quartz Glass
Hygger Aquarium Heater

500-800 Titanium

Best Heater for Reef Tank Pro and Cons

Let’s get started with our list:

1. Cobalt Aquatics Flat Neo-Therm Heater


  • Compact design
  • Super flat design
  • Accurate temperature display


  • Only available in smaller wattage

If you want a long-lasting and feature-packed heater for your saltwater aquarium, the Cobalt Aquatics Neo-Therm Heater is one of the best to consider. It has a matte black surface with a super-flat design that gives it a very premium look.

What we like most about this aquarium heater is its build quality. Most aquarium heaters are made of cheap glass, which can easily break. Unlike them, this thermoplastic heater has a sturdy casing with a shatterproof outer coating for exceptional durability.  It is made out of a shatterproof outer casing that can last submerged underwater for several years.

The Neo-Therm is also one of the most compact heaters available, and it is completely submersible. It can easily fit into any aquarium and will accord very nicely if put inside a display tank. This heater also works perfectly with terrariums, making it a great choice if you wish to pet turtles or other reptiles.

In larger tanks, the reef tank heater can reach 96 F and support larger tanks. It provides remarkably accurate readings within 0.5 F, guaranteeing you precision and assurance that your water is at the appropriate temperatures. It also has an LED display that reads the current temperature of the tank, so you don’t have to use an external thermometer to check it.

Cobalt’s heater also has some innovative internal protections to prevent it from overheating. Most reef tank heaters are designed to increase an aquarium’s temperature by 2-3 F over natural temperature. It is questionable and misleading because the average home temperature fluctuates 2 to 3 F or more all through the day.

The neo-therm is labeled for its capability to increase 11 F over ambient temperatures and has a reliable auto shut-off mechanism. It assures the tank’s safety at all times and reduces the danger of overheating.

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The Cobalt Aquatics Neo-Therm Heaters are unbeatable if you have a system with sensitive marine animals that demands exact and consistent water temperature. This heater allows you to set the temperature range and keep it within 0.5 F of the settings. The control system indicates the current temperature as well as the set temperature using LEDs.

2. Eheim Jager Aquarium Thermostat Heater


  • Dry sensor
  • Easy-to-read settings
  • Precise calibration


  • Hard to set horizontally due to its length

If you’re searching for a trustworthy submersible heater for a large tank, Eheim Jager Aquarium Thermostat Heater may be the perfect option for you. The long-lasting heater is made of shock-resistant and shatterproof glass that makes Jager a durable choice for your fish tank. It even has shatter-resistant glass, which not only protects but also increases the heating surface area.

The Eheim Jager is available in various sizes, so you can choose the best to suit your aquarium. It is a fully submersible heater with moderate pricing. It even has shatter-resistant glass, which not only protects but also increases the heating surface area.

The TruTemp dial on this heater provides consistent and accurate temperature control. This feature allows you to control the temperature from 65 F to 93 F. There is also an on/off indication light that helps in monitoring the temperature quickly. The readings are accurate to within 0.5 degrees. Such features are hard to come by in low-cost heaters.

This heater comes in a range of models with varying power levels. The wattage ranges from 25 watts and goes up to 300 watts. You can select the one that is most suitable for your tank.

One of the best things about this saltwater fish tank heater is its auto-cut feature that turns off the power supply if the water level drops below a certain level to prevent overheating. However, it automatically starts heating the aquarium again once the water level is restored.

Assembling the heater is very easy as it already comes with a mounting bracket and suction cups. The suction cups keep the heater firmly in place while also allowing you to position it wherever you want in your aquarium.

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The Jager Aquarium Thermostat is quick and straightforward to use. It features an automatic shut-off mode and keeps the temperature within 0.5 F of the range you set. It heats pretty fast and maintains a constant temperature. The wide surface area of this heater makes it easy to keep the water at the proper temperature, and It also includes an active heating mode indication light.

3. Finnex HPC Digital Quartz Glass Heater


  • Out-of-water protection
  • Digital display for readings
  • Thick, long-lasting glass


  • It can get hazardously hot when not submerged

The Finnex HPC heater is a small digital glass heater that fits into even the smallest aquariums. However, with a power output of 200 watts, it is best suited for medium-sized tanks ranging from 55 to 80 gallons.

This heater uses a 2mm glass construction that is highly durable. In addition, the heater guard protects your marine pets from getting injured if they accidentally come into contact with the heating tube. Since the quartz glass is solid, you won’t have to worry about replacing this device in the long run.

This saltwater aquarium heater features a modern digital processor to monitor and adjust your aquarium’s water temperature. The heating controller gets the readings from the aquarium’s sensor system.

Additionally, the external remote sensor helps prevent disturbances caused by proximity to the heating source and does not have any bimetallic connections that might arc, corrode, or wear out.

It enables HPC heaters to have excellent control, maintaining the water temperature constant while avoiding the large temperature fluctuations that are usually common with low-quality aquarium heaters.

The remote sensor also serves as an automatic power switch. If the water level falls below a certain level, exposing the temperature sensor to the air, the heater’s power gets switched off. It keeps the tank from overheating, safeguarding your valued tank life.

The heater has an easy-to-use onboard controller and a digital display, making it an effective entry-level glass heater. The display lets you monitor the temperature at a glance. The temperature modification button is situated outside the power cord, so you wouldn’t have to get your hands wet when making adjustments.

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Finnex has been producing high-quality, small electric aquarium heaters for several years, allowing you to maintain a safe and consistent temperature within the tank. If you’re looking for a compact yet powerful heater for a mid-size aquarium, the Finnex HPC heater is a great option to consider.

4. Hygger Aquarium Heater


  • Ideal heater for huge tanks
  • A digital controller to manage settings
  • Speedy heating


  • It comes at a relatively higher price

The Hygger Titanium heater is a reliable option for aquarists that like feature-rich aquarium equipment. The Hygger aquarium heater, with 500-watt output, is by far the quickest to heat the tank’s water. It is suitable for aquariums ranging in size from 60 to 180 gallons.

The interior material has been modernized and enhanced with titanium steel, which is safe to use, less prone to deformation, and has high corrosion resistance. It includes a double-sealed black safety shield that provides the heater with an exclusive shape while protecting the fish and you from burning. For added security, there is a built-in thermometer and an external controller.

The heater also has an energy-saving function that automatically minimizes power consumption once it reaches the preset temperature. The device continues to use thermal energy inertia to maintain the desired temperature efficiently. Moreover,  It has a memory capability that saves you from setting the temperature every time you turn off the heater.

After installing the heater and filling the aquarium with water, you can set the desired temperature between 70 F to 94 F. The LCD will indicate the current water temperature after connecting the heater to a power socket.

This heater is smart enough to detect the presence of water around it. When the heater rod comes into contact with air, the ER error code is displayed, and the heater shuts off immediately, preventing dry heating. When the heating rod is entirely immersed in water, it will automatically begin functioning. The service life is effectively extended as a result.

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If you are looking for the best aquarium heater for an aquarium over 150 gallons, the Hygger titanium heater is the one to get. It is packed with the most advanced features and has a premium build quality. The Hygger aquarium heaters are among the heavy-duty heaters available, capable of heating even large tanks of up to 180 gallons in a matter of a few minutes.

How to Pick the Best Aquarium Heater

Here are a few points to consider while choosing a saltwater aquarium heater:


Even though some heaters are packed with innovative features that might sometimes seem overpriced, they add up in the longer run. You don’t need to get your hands on the most expensive ones, but make sure your heater has a few basic features like an auto cut-off, temperature control, a screen to display your tank’s current temperature, etc.

Size of the Aquarium

If the heater you choose is overpowered, it can overheat your aquarium. Moreover, it will be a waste of money to invest in an aquarium heater for a 200-gallon tank only to use it for a 50-gallon one. On the other hand, If you use an aquarium heater designed for a 50-gallon tank to heat a 200-gallon aquarium, it will be inefficient and will take forever in the process. So make sure to choose the right heater according to your tank’s size.

Type of Aquarium Heaters

High-quality glass heaters are made with durable glass resistant to thermal shocks and less likely to malfunction. They may still break if dropped or struck by an object but in regular use; they should be fine, especially if put in a safe region. Titanium heaters, such as the Finnex heaters, are almost unbreakable and ideal for larger fish tanks. But, they are also the most costly of the bunch.

Submersible or Not

In most situations, saltwater aquarium heaters are submersible or in-line. In-line aquarium heaters are attached to the outflow line of your aquarium filters and heat the water while it flows to the tank. Many submersible heaters can be installed vertically, on the sides, horizontally, or in the tank’s bottom center. Usually, an aquarium heater includes detailed instructions on how to position it in the tank optimally.


It is critical to get a product from a well-known brand. It not only ensures a high-quality construction, but it also provides far better customer support. You should also ensure that it comes with a reasonable guarantee, which is quite helpful if a device fails due to manufacturing flaws. Furthermore, repairs within the warranty period are usually free of charge.

Budget and Value for Money

Consider all of the features you’ll need before deciding on a budget. If a function you desperately need isn’t available within your price range, there’s no use in purchasing it. Check that the product has all of the features you require before deciding on a budget. If the product you’ve picked lacks all of the characteristics you want, you might consider increasing your budget.

There may be times when you will come across numerous heaters that offer all of the characteristics you require. However, there will be a price variation. In this case, we advise valuing each feature and ensuring that you are not overpaying for an element that you will not enjoy.


Let’s discuss a few frequently asked questions related to saltwater aquarium heaters:

1. Do You Need a Heater for Saltwater Tanks?

Yes, having a good quality heater is very important if you have a saltwater tank. This is because marine animals are accustomed to living in warmer climates as compared to most indoor and household rooms. Thus, to maintain the added heat, a heater is the best solution. Although, if you live in a warmer climate area near the equator, it might be possible to manage your tank without a heater.

2. What’s the Best Temperature for a Saltwater Reef Tank?

While there is no set temperature that works for all species of fish and plants, most aquarists put this figure between 75 to 80 degrees Fahrenheit. This temperature is similar to most natural habitats of coral and would be a safe bet for saltwater reef tanks. That being said, be sure to do your research as each specific species of coral and fish have their own requirements.

3. Where Do You Put a Heater in a Saltwater Tank?

The best place to keep your aquarium heater is near a region of high water flow. This could be near an air pump or filter so that the hot water is dispersed into your tank quickly and evenly. However, try to make sure you don’t place it right in front of a filter intake as the water might be too hot for some sponge and bio-filters.


Heaters are undoubtedly one of the most crucial pieces of equipment in any reef tank. Choosing a suitable product is complex, and many times it may be a time-consuming process. However, the article aims to assist you in finding the best saltwater fish tank heaters for your needs.

We researched to ensure that the choices mentioned are some of the best, and we believe you selected a heater that meets your expectations while still being within your budget. However, if you are still unsure and would like our final advice, we are here to assist you.

Even though all of the items described above are outstanding saltwater aquarium heater options, one shines forth. We found the Cobalt Aquatics Flat Neo-Therm Heater to be an excellent choice to consider and a great heater. Its super-flat, compact form gives it a contemporary appearance that fits into even the smallest of places.

Best saltwater aquarium heaterIt flawlessly blends design, performance, and sturdiness into a heater. It is inexpensive, submersible, and you can entirely depend on it. With a 3-year guarantee, this mid-range heater will operate well and; will appear sleek and elegant in any home aquarium.

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