Fluval Submersible LCD Aquarium Heater

Advanced Electronic Aquarium Heater

The LCD temperature display provides peace of mind as the actual aquarium water temperature is continuously displayed in either Celsius or Fahrenheit. During normal operation the temperature read out will change color if the aquarium water varies +/-1°C or +/-2°F or more from the preset temperature. Make sure to mount the heater at a 45 degree angle to get best heat distribution. We recommend 5 watts of heater per gallon of water. When in heating more than 10 degrees from room temperature, consider up sizing. Also we highly recommend using a glass top to keep your heat in. 

  • LCD displays actual water temperature 
  • High/Low temperature alert 
    • Should any external heat sources or other equipment, such as chillers, cause the aquarium water temperature to rise or fall beyond 3°C or 5.5°F, the colored screen will flash, indicating a potential risk.
  • Precise and easy temperature adjustment
    • With the easy to use adjustment lever the temperature can be precisely set in 0.5°  increments
  • Advanced fish protection
    • The integrated fish guard offers advanced protection. Fish and invertebrates cannot come in direct contact with the heater core. The heater is protected against shocks from large fish species.
Model Aquarium Size
E100 up to 30 gallons 
E200 up to 65 gallons
E300  up to 100 gallons


Customer Reviews

Based on 88 reviews
Nicely designed

I like the way these heaters are designed with a heavy shield to keep critters off them and with the color temperature available from across the tank at a glance. And an easy to adjust setting as well.

Great heater.

Love it!

Great Heater

Tested with calibrated meter and alcohol thermometer and it is right on for temp. Works perfectly and the screen is easy to read.

Fluval Heater

Haven’t installed yet but love the digital display and that I can set the temperature and it’s not a preset.


Fluval Submersible LCD Aquarium Heater