0 395 0 likes

Best 500 Watt Heaters for 100+ Gallon Aquarium Fish Tanks

Fish keeping hobby requires an ample amount of dedication, especially when it comes to maintaining aquariums. It is of the utmost importance to ensure that the temperature of water in the aquarium is balanced, apart from providing feed to the fish and cleaning the tank. And what happens when one requires a big aquarium requiring the water capacity to be more than 100 gallons? This is when it becomes a matter of concern because there are not many aquarium heaters available that can heat that much water while maintaining a steady temperature. Keeping this in mind, four of the finest 500-watt tank heaters are listed below.

JBJ External TitaniumFinnex External TitaniumISTA In-Line Heater
Our Pick
JBJ True Temp Titanium Heating System Kit for Aquariums 500watt Buy From Amazon
Finnex 500Watt HangOn Electronic Controller Aquarium Heater Titanium Tube 100 to 120Gallon Buy From Amazon ISTA IH616 500W Inline External Heater Buy From Amazon
Trusted brand, external controller, many featuresExternal controller, titanium tube, dial settingsIn-line heater, connects to canister filter, easy to use
Read ReviewRead ReviewRead Review
Check Price & AvailablilityCheck Price & AvailablilityCheck Price & Availablility


1. JBJ Titanium Accurate Temperature Heating Kit

The JBJ titanium temperature heater comes with a calibration setting system and +0.5 to -0.5°F temperature accuracy. This controller of this heater has its heating indicator and display made of LED. This way, one is aware of the heater's functioning as well as the temperature at the given time.

JBJ True Temp Titanium Heating System Kit for Aquariums 500watt

JBJ is a trusted brand and offers a fantastic titanium external heater, plenty of features and trusted brand!

Check Latest Price on Amazon

Free Shipping Available


This heater also comes with a memory chip that can remember and help reset the tank's temperature to the preceding set temperature in case of a power failure.

This heater features a durable heating element made of titanium along with a thermal shutoff valve to protect it from damage.

The heater's heating cylinder is contained in a protective heater guard, protecting the fish and the owner from its core heating element. For a quick and easy arrangement, it comes with an absorption cup.

This heater has a wattage of 500 watts with its temperature reading in Fahrenheit. It can be used for 100-160 gallon fish tanks and is ideal for both saltwater and freshwater uses.

2. Finnex Electric Controller Heater

The Finnex electric controller heater is unlike any other heater available in plenty for small fish tanks. It is ideal for large tanks that can store up to 100-120 gallon of water. It has a controller to manage the heat of the water, a heating cylinder which is submersible, along with a heater guard protector and high heat absorption cups.

Finnex 500Watt HangOn Electronic Controller Aquarium Heater Titanium Tube 100 to 120Gallon

With an external temperature controller and titanium submersible heater, makes this heater super easy to use and keep your hands out of the fish tank!

Check Latest Price on Amazon

Free Shipping Available


This heater controller goes outside the tank to control the heating cylinder which goes inside the tank. This distinctive design allows the controller to regulate the temperature of the water. In this way, it forbids one's hands from getting wet along with an added protection from electric shocks.

The maximum and minimum temperature of the Finnex heater is somewhere between +2 and -2 °F of the allotted temperature. This allows for the fish in the tank to survive in a safe water setting.

The Finnex heater's refined analog temperature controller comes with a semiconductor device (LED) that emits light, an indication that it is functioning.

The heating cylinder of the heater is a titanium-make, which allows for the heater to raise the temperature of the water at maximum speed. This cylinder is resistant to corrosion, is firm, entirely safe for freshwater and saltwater uses, and lasts longer than glass heaters.

The wattage of the Finnex electronic controller heater is 500 watts and with a temperature reading of 70-92 °F. It also comes with indicator lights on the temperature controller for power and heat. Other sizes of this product range from 100W, 150W, 200W to 300W.

3. ISTA In-Line External Aquarium Heater

The 500-watt ISTA in-line fish tank heater is easy to install and control the aquarium temperature. It also has advanced technological features for the safety of the user, along with precise temperature control settings.

ISTA IH616 500W Inline External Heater

Easy to read temperature display, connects to external canister filter hose, nothing goes in the tank!

Check Latest Price on Amazon

Free Shipping Available


The design of this heater connects to an existing external canister filter hose line. This enables you to easily view and adjust temperature settings. The heater's controller shows the assigned temperature, and its lighting is an LED which assists in letting the owner know when it is turned on or turned off.

This heater, like all heaters, needs to be used carefully because its improper usage may cause the heater to malfunction. It comes with a manual guide to help in the installation, usage, and maintenance process. This heater comes with a wattage of 500 watts and its temperature reading is in Fahrenheit. It is ideal for 100-130 gallon aquariums, ideal for both saltwater and freshwater uses.

4. Finnex Digital Controller Heater with Titanium Deluxe Cylinder

The 500-watt Finnex digital controller heater comes with an audio notification system to help one monitor the temperature of the water. Its deluxe heat controller with an LED display helps maintain a stable and efficient heat transfer, shielding the fish in the tank from variations in temperature.

Finnex Digital Heater Controller with Deluxe 500watt Titanium Tube

Check Latest Price on Amazon

Free Shipping Available


This digital heater makes use of technology to the maximum level. It is a programmable heater that allows one to set temperatures in advance in cases of power disruptions.

An additional characteristic of this digital heater is the heater guard protector surrounding the titanium cylinder, ensuring the safety of the fish.

This heater comes with a wattage of 500 watts and its temperature reading is in Fahrenheit. It can be used for fish tanks up to 130 gallons and is safe for both saltwater and freshwater uses. Other sizes include 300W and 800W.

What are your thoughts? Sign Up or Log In

Have a tropical fish question?

Join our tropical fish community, post some questions, get some answers and vote for the best posts.

Submit a new post or link!