Aqueon Submersible Aquarium Heater 300W
The Aqueon Submersible Aquarium Heater 300W is crafted from thermal shatter-resistant quartz glass, ensuring exceptional durability by withstanding impacts. It features an electronic thermostat that halts heating once the desired temperature is achieved. A visible power indicator light shows when the heater is active, and it comes with a lengthy 6-foot power cord. Certified by UL, this heater includes a safety mechanism to shut off if not fully submerged, preventing overheating and potential damage. It can be placed either vertically or horizontally and is suitable for both freshwater and saltwater tanks.
Specifications
| Feature | Detail |
|---|---|
| Heating Power | 300W |
| Material | Thermal shatter-resistant quartz glass |
| Thermostat Type | Electronic |
| Power Cord Length | 6 feet |
| Safety Feature | Shut off if not fully submerged |
| Usage | Freshwater and saltwater tanks |
| Certification | UL certified |
FAQ
Can this heater be used in both freshwater and saltwater tanks?
Yes, the Aqueon Submersible Aquarium Heater 300W is suitable for both freshwater and saltwater tanks.
Does the heater have a safety feature to prevent overheating?
Yes, it includes a safety mechanism that shuts off the heater if it is not fully submerged, preventing overheating and potential damage.
How does the thermostat work?
The electronic thermostat halts heating once the desired temperature is reached, maintaining a consistent water temperature.

Blake Roberts –
This heater has been running smoothly in my 55-gallon saltwater tank for over six months. The temperature stays stable and the indicator light is easy to see. It’s reliable and the glass is sturdy even after a few drops of water on the surface.
Joe White –
I installed it in my freshwater tank and it maintains the temperature well. The power cord is long enough to reach the tank without stretching. No issues so far, though I did notice the light turns off when the tank is not fully covered.
Trevor Abraham –
Great build quality. The quartz glass holds up well, and the thermostat keeps the water at the set temperature without fluctuations. Works perfectly in a 30-gallon tank with a mix of fish and plants.