Tetra HT40 Submersible Heater 150W 30 to 40 Gallons

Tetra's HT line of heaters are easy-to-use and work in aquariums ranging from 2 to 55 gallons.

The heaters have electronic thermostats that automatically adjust heat output to keep water at a constant 78 degrees F.

All HT heaters have indicator lights to let you know when the heater is on, heating the aquarium.