Aqueon Submersible Aquarium Heater, 50 Watts

The Aqueon Submersible Aquarium Heater (model 100528680) is a 50 Watts heater for freshwater and saltwater aquariums up to 20 Gallons. It uses an electronic thermostat with precise settings adjustable to 1° F across a range of 68-88° F.

Electronic thermostat

Electronic thermostats tend to hold temperature more tightly than older bimetal strips. The heater stops heating once the set temperature is reached and switches back on when the water cools. An LED light turns on while the water is being heated.

Safety

The heater is fully submersible and shatter-resistant. It has automatic safety shut off and overheat protection: if it overheats, for example when exposed during a water change, it shuts off and resets once it cools down.

Sizing

50 Watts suits tanks up to 20 Gallons in a typical home. In a cold room or a tank near a window, consider the next size up or a second heater. Very small tanks of a few gallons can do with less wattage, which limits overshoot if something goes wrong.

Setup tips

• Mount it near the filter outflow for even heat.
• Set it, wait a day, then check with a thermometer.
• Unplug before water changes, even with the auto shut-off.
• Keep the full body below the water line.

Warranty

Aqueon backs the heater with a Limited Lifetime warranty, unusual at this size.

Compare

Aqueon also makes the Aqueon Pro adjustable heater with a shatterproof shell for larger tanks. For a digital readout in a similar size, look at the HITOP 50W or a controller-based heater.

Who it suits

Keepers of small to mid freshwater and saltwater tanks who want a precise, well-warrantied heater from a familiar brand. Adding a separate thermometer is still wise; no thermostat is perfect, and a second reading confirms everything is working as the seasons change.