Aqueon Flat Heater
Aquatic Flat Heaters provide warmth for small tropical fish and are designed for glass or acrylic desktop aquariums at least 1 gallon in size, but less than 10 gallons. They are completely submersible, easy to install, and efficiently warm aquarium water. Suction cups are included so you can mount the heater to the bottom or side wall of the aquarium. Be sure to choose the appropriate size for your aquarium.
Specifications
| Feature | Detail |
|---|---|
| Heater Type | Flat, submersible |
| Compatible Aquarium Size | 1 gallon to less than 10 gallons |
| Material | Plastic with suction cups |
| Installation | Mounts via suction cups on glass or acrylic tanks |
FAQ
Can this heater be used in a 5-gallon aquarium?
Yes, the Aqueon Flat Heater is suitable for aquariums between 1 and 10 gallons, so it can be used in a 5-gallon tank.
Is the heater safe for use with tropical fish?
Yes, it is designed specifically for small tropical fish and provides consistent, gentle heating.
Can I attach the heater to the side wall of the tank?
Yes, the included suction cups allow you to mount the heater to the bottom or side wall of the aquarium.


Phil Lee –
The heater works well in my 4-gallon tank. It keeps the water warm during cooler evenings and is easy to install with the suction cups. No issues with overheating or bubbles. Simple and effective.
Faith Davidson –
I used it in my desktop aquarium and it maintains a stable temperature. The suction cups hold firmly, and it doesn’t interfere with fish movement. A reliable choice for small tanks.
Alan Bailey –
Perfect for my 6-gallon tank. The heater is flat and doesn’t take up much space. It heats the water evenly and stays quiet. I’ve had no problems since installation.