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The Best Submersible Aquarium Heater 2019 – Healthy Fish Is Happy Fish

Professional veterinary specialist with 10 years of experience. - Alisa Moor

publication time: 23:07

What Is A Submersible Aquarium Heater?

As its name suggests, this is a device that’s kept submerged in aquarium water to heat it up and maintain comfortable temperature for fish. There are several types of heaters:

  • Hanging/Partially submersible 
  • Fully Submersible
  • Substrate 
  • In-line 
  • Filter 

Compare The Best Submersible Aquarium Heaters




 Aquarium capacity

Temperature range

Automatic shut off


Type of installation



Aqueon Submersible Aquarium Heater

BUY NOW AMAZON Up to 20 gallons 68-88 °F Yes Thermal shatter-resistant quartz glass Suction cups 50 W 1.4 x 1.4 x 8.8 inches

FREESEA 50-300 Watt Aquarium Fish Tank Heater with LED Temperature Display

BUY NOW AMAZON Up to 10 gallons 59 to 94°F Yes Plastic & glass Submersible

50 W

2.5 x 1.5 x 3.5 inches

Aquatop Aquarium Glass Submersible Heater, 300-Watt with Liquid Crystal Vertical Aquarium Thermometer

BUY NOW AMAZON Up to 5.5 gallons 78°F ( + / – 2°) Yes PPC plastic Suction cups 15 W

ViaAqua 200-Watt Quartz Glass Submersible Heater with Built-In Thermostat

BUY NOW AMAZON Up to 50 gallons

68 to 93 °F


Quartz glass

Submersible 200 W 1.13 x 1.13 x 12.5 inches1.13 x 1.13 x 12.5 inches

Orlushy Submersible Aquarium Fish Tank Heater

BUY NOW AMAZON Up to 80 gallons 68 to 89 °F Yes Quartz glass Submersible 300 W

Submersible Aquarium Heaters Reviews

With these reviews, you will be able to select the best aquarium heater that fits your requirements and budget ideally.

Aqueon Submersible Aquarium Heater

Aqueon Submersible Aquarium Heater


Simple and minimalistic, Aqueon heater can be placed in any position (horizontal or vertical). It allows adjusting temperature by 1 degree within the range of 68-88 °F. The model can be used in aquariums up to 20 gallons. Once the required temperature level is set, it shuts off automatically to eliminate the risk of overheating.

Our opinion

A cheap, convenient model, but it can heat one part of aquarium leaving the opposite walls quite cold.


  • Automatic shut-off;
  • Non-expensive;
  • Precise temperature adjustment.


  • Suitable for small aquariums only.
FREESEA 50-300Watt Aquarium Fish Tank Heater

FREESEA 50-300Watt Aquarium Fish Tank Heater with LED Temperature Display


Ideal for small aquariums up to 10 gallons, this fully submersible aquarium heater boasts the temperature range of 59 to 94°F (15 – 34°C). It can maintain the optimal temperature automatically and will stop when the needed level of heat is reached. The temperature is shown on the display, and you can change the settings manually.

Our opinion

Great for replacing other thermometers, should be used in small aquariums.


  • Wide temperature range;
  • Display showing degrees.


  • Relatively expensive.
Aquatop Aquarium Glass Submersible Heater

Aquatop Aquarium Glass Submersible Heater, 300-Watt with Liquid Crystal Vertical Aquarium Thermometer


Another automatic heater, the model from Aquatop has a preset temperature of 78°F ( + / – 2°), so no adjustments are required. It’s produced from durable PPC plastic. The indicator shows when the device is on, and a suction cup allows placing it where you need. Suitable for small aquariums up to 5.5 gallons.

Our opinion

Good option only for small aquariums with tropical fish.


  • Cheap;
  • No manual adjustment required.


  • Only preset temperature;
  • Works only for small aquariums up to 5.5 gals.
ViaAqua 200-Watt Quartz Glass Submersible Heater

ViaAqua 200-Watt Quartz Glass Submersible Heater with Built-In Thermostat


This is the best submersible aquarium heater for larger aquariums (up to 200 gals). You can use the model in both saltwater & fresh aquariums. Made of high-quality quartz glass, it withstands damage and has a temperature range from 68 to 93 °F.

Our opinion

A perfect choice for large aquariums and optimal overall warming.


  • Very powerful;
  • Suitable for large aquariums.


  • No suction cups for attachment.
Orlushy Submersible Aquarium Heater

Orlushy Submersible Aquarium Heater,100W/150W/200W/300W Fish Tank Heater


This 300 Watt heater is made for large aquariums (50-80 gal) and comes with a thermostat to control the temperature ranging from 68 to 89°F. Automatic shut off prevents overheating. It’s equally good for saltwater & freshwater tanks.

Our opinion

Non-expensive but a bulky heater for large aquariums, buy it if you’re ready to deprive your fish of a bit of space.


  • High efficiency;
  • Non-expensive.


  • Takes much space.

Frequently Asked Questions

Q: What Type Of Submersible Heater If My Aquarium Is Not Glass?

A: You don’t want the aquarium to be melted by the hot thermostat, so choose models where the coil is encased in glass. Besides, it’s better to choose models that are supposed to be simply submerged in water and don’t have suction cups or other elements attaching them right to the tank walls. Generally, it’s safe to use aquarium heaters in plastic tanks – it still has a safe temperature.

Q: How To Use Submersible Aquarium Heater?

A: The process is quite simple:

  • Set up the optimal temperature on the thermostat.
  • Place the device in the water and attach it, if necessary.
  • Plug the device in and let it heat up the water.

If it doesn’t have an automatic shut off, you’ll have to watch the temperature of the water and switch the thing off at the right moment.

Q: How Do You Set Submersible Aquarium Heater Temp?

A: It depends on the model. In most of them, it’s done with buttons – follow the applied instruction.

Q: Where To Put Submersible Water Heater In Aquarium?

A: Some of the heaters can be attached to the inner side of aquarium walls with suction cups. Others simply hang on a cord and can be left submerged.

Conclusion & Our Recommendations

Hopefully, these submersible aquarium heater reviews will help you make the right decision. For small aquariums, Aqueon Submersible Aquarium Heater is the most cost-efficient choice with a price tag up to $20. For the same price, you can find a model for larger aquariums, for example, Orlushy Submersible Aquarium Heater.

When in search of a heater, look at three key aspects: power consumption, materials, and automatic temperature control. Besides, temperature range also matters. For tropical fish, seek for models with a high heating capacity. For marine fish, choose heaters to keep water at the level of 60 F degrees.


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