Heaters · Adjustable, electronic
Fluval E100
Manufacturer-rated for aquariums up to 30 US gal; adjustable 68–93°F.
100 W submersible heater with digital temperature display, dual sensors, and fish guard.
Consider: The body is 11.75 inches tall. Check the available mounting space and water depth before choosing it for a shallow tank.
US version, item A772. Check what’s in the box before you buy.
Tank size Fluval rates it for
Up to 30 US gal
Choose your tank to see where it falls.
Check it against your tank →Specifications that affect fit
- Manufacturer capacity
- Up to 30 US gal
- Power
- 100 W
- Supply voltage
- 120 V / 60 Hz
- Dimensions
- 2 × 1.25 × 11.75 in (L × W × H)
To see what it costs to run, enter the watts on its label and your daily hours in the electricity cost calculator.
Before choosing this model
- Size for tank volume and the required rise above room temperature.
- Verify temperature with a separate thermometer.
Our buying guides size it for these tanks:
5 gallon10 gallon20 gallon29 gallonBetta tank
A heater rated for your tank can still fall short in a cold room: see how to size one.
Check it against your tank → Something not working? See the troubleshooting guide.
Included items & upkeep
- heater
- fish guard
- mounting bracket
Plan for the routine work
- Unplug and allow the heater to cool before removal.
- Keep the sensor and exterior free of deposits per the manual.
To budget for replacement media and supplies, use the first-year cost calculator. For how often and how to clean it, follow the maker’s manual.