Heaters · Preset
Tetra HT40
Manufacturer-rated for 30–40 US gal and preset to 78°F.
150 W preset submersible heater with heating and standby indicator lights.
Consider: Preset to 78°F with no user adjustment. Choose an adjustable heater if your fish need a different temperature.
US version. Check what’s in the box before you buy.
Tank size Tetra rates it for
30 to 40 US gal
Choose your tank to see where it falls.
Check it against your tank →Specifications that affect fit
- Manufacturer capacity
- 30–40 US gal
- Power
- 150 W
- Supply voltage
- Not published
- Dimensions
- Not published
To see what it costs to run, enter the watts on its label and your daily hours in the electricity cost calculator.
Before choosing this model
- Confirm 78°F suits the animals.
- Use a separate thermometer and ensure the tank has the hood or canopy required by Tetra.
What Tetra doesn’t publish
- Tetra doesn’t publish the body size or the voltage. Check the mounting instructions and the label on the box before you buy for a tight space.
Our buying guides size it for these tanks:
A heater rated for your tank can still fall short in a cold room: see how to size one.
Check it against your tank → Something not working? See the troubleshooting guide.
Included items & upkeep
- heater
- mount
Plan for the routine work
- Unplug and cool before removal.
- Follow the included instructions for placement and water level.
To budget for replacement media and supplies, use the first-year cost calculator. For how often and how to clean it, follow the maker’s manual.