Fluval P25 Pre-Set Aquarium Heater
The Fluval P25 is a reliable, pre-set aquarium heater designed for 6-gallon tanks. It maintains a consistent temperature between 76-78 °F (24-26 °C) in both freshwater and saltwater environments.
- Strong shatterproof polymer construction protects the tank and aquatic life from damage
- Preset temperature requires no adjustment for stable water conditions
- Waterproof and fully submersible, allowing easy placement inside the aquarium
- LED running lamp indicates when the heater is active
- Designed for use in both freshwater and saltwater nano aquariums
| Feature | Detail |
|---|---|
| Temperature Range | 76–78 °F (24–26 °C) |
| Water Type | Freshwater and saltwater |
| Construction | Shatterproof polymer |
| Submersion | Full submersion, waterproof design |
| Indicator | LED running lamp |
FAQ
What temperature does the Fluval P25 maintain?
The Fluval P25 maintains a consistent temperature between 76–78 °F (24–26 °C) in both freshwater and saltwater aquariums.
Is the heater suitable for saltwater tanks?
Yes, the Fluval P25 is designed for use in both freshwater and saltwater aquariums.
Does the heater require any setup or adjustment?
No, the P25 has a preset temperature and requires no adjustment for stable water conditions.

Oliver Allan –
The heater works perfectly in my 6-gallon tank. It keeps the water stable without any adjustments. The LED light is helpful to know when it’s running. No issues with leaks or overheating so far.
Sue Davidson –
I’ve used it in both freshwater and saltwater setups. It maintains the temperature well and the durable plastic feels solid. The only thing is it’s a bit small for larger tanks, but perfect for nano setups.
Nicholas Hardacre –
Easy to install and stays in place without moving. The temperature stays steady, and the LED indicator helps me monitor it at a glance. No problems after two months of use.