Fluval T Series Aquarium Heaters

The Fluval T Series is a line of fully electronic submersible heaters that hold your aquarium at a precise, stable temperature. A top-mounted dial sets the target, while advanced electronic sensors monitor the water around the clock and make fine corrections to avoid the swings that cheaper heaters allow. If the heater is ever exposed to air, a safety shut-off cuts the power to prevent overheating. Safe for both freshwater and saltwater.

Have a nano tank? The preset Fluval P Series covers aquariums up to 15 gallons. Want a heater that disappears into your aquascape? See the mirror-glass Fluval M Series. Pair any heater with a digital thermometer.

Features

• Fully electronic, digital accuracy. A precision sensor holds your setpoint tightly instead of drifting like a basic bimetal thermostat.
• Top-mounted control dial. A large, easy-grip dial sits above the waterline for quick, clear temperature adjustment.
• 24/7 monitoring. Continuous electronic regulation makes small corrections all day to avoid large, unsafe swings.
• Safety shut-off. If the heater is exposed to air, power is automatically cut to prevent overheating and damage.
• 3-year warranty. Backed by a 2-year warranty plus 1 bonus year with registration.
• Fresh or salt water. Rated for freshwater and saltwater aquariums alike.

Choose Your Size

Match the wattage to your tank volume, and size up if your room runs cold. Larger aquariums often run two heaters for even coverage and redundancy.

How to Use

Mount the heater fully underwater near good flow, such as beside a filter outlet, so heated water circulates evenly. Let it sit for 15 to 30 minutes before powering on so the sensor matches the water. Set the top dial to your target, wait for the tank to stabilize, and confirm with a thermometer before trusting the reading. Always unplug the heater before removing it from the water.

FAQ

How do I set the temperature?
Turn the top-mounted dial to your target and let the electronic sensor hold it. Give the tank time to stabilize and verify with a separate thermometer.

What does the safety shut-off do?
If the heater is uncovered or run dry, it automatically cuts power to prevent overheating, cracking, or a spike in temperature.

Is it safe for saltwater?
Yes. Every T Series heater is rated for both freshwater and saltwater aquariums.

Which wattage should I choose?
Match the model to your tank size: T50 for up to 15 gallons through T300 for up to 80 gallons. Size up in a cold room, or run two smaller heaters on a large tank.