Heaters · Adjustable submersible
Aqueon Submersible Glass Heater 50 W
Aqueon rates it for aquariums up to 20 US gal; adjustable from 68 to 88 °F.
Aqueon’s adjustable submersible heater in shatter-resistant quartz glass, with an electronic thermostat that stops heating at the temperature you set, from 68 to 88 °F in 1 °F steps. It switches itself off if it overheats or isn’t covered by water, and resets once it cools; a light shows while it heats. A 6 ft cord; for fresh or salt water, upright or lying down.
Consider: Set it anywhere from 68 to 88 °F, a degree at a time. At 8.75 in long, check it fits upright below your water line, or lay it on its side.
US version, item 100528680. Check what’s in the box before you buy.
Tank size Aqueon rates it for
Up to 20 US gal
Choose your tank to see where it falls.
Check it against your tank →Specifications that affect fit
- Manufacturer capacity
- Up to 20 US gal
- Power
- 50 W
- Supply voltage
- Not published
- Dimensions
- 8.75 × 1.375 × 1.375 in (L × W × H)
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
- Size it from your coolest room and the water temperature you want, with Aqueon’s wattage chart, not from the gallons alone.
- Use a separate thermometer to check the setting.
What Aqueon doesn’t publish
- Aqueon doesn’t publish the voltage. Read it on the label before you buy outside the US.
Our buying guides size it for these tanks:
5 gallon10 gallon20 gallonBetta tank
Item details from Aqueon 2026 Aquatic Product Catalog, page 35, Submersible Aquarium Heaters item 100528680.
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 with 6 ft cord
Plan for the routine work
- If it stops heating after running dry or too hot, let it cool in the water: Aqueon says it resets itself.
- Unplug it and let it cool before you take it out of the water.
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.