AQUANEAT Aquarium Heater, 50W

The AQUANEAT Aquarium Heater (model G416) is a 50W adjustable submersible heater for freshwater and marine tanks. AQUANEAT recommends it for 5 to 15 gallon fish tanks. A 25W preset version (model G405) is also offered for smaller tanks.

50W: adjustable

An easy-to-access dial on the top sets the water temperature from 65°F to 89°F. The red light shuts off when the target is reached, and the heater then holds a constant temperature.

• Heater length: 6.75”
• Power cord: 3.6ft
• Voltage: 110V/60Hz
• Includes 2x suction cups and a thermometer strip

25W: preset

The 25W model is only 4.5” long and suits tanks from 3 to 5.5 gallons. It is preset to 78°F, a good temperature for bettas and most tropical fish, so there is nothing to set. The light turns red when heating and green when resting, making a daily check easy. It includes one suction cup and a thermometer strip.

Which to choose

Pick the 25W for a betta or nano tank where 78°F is the goal. Pick the 50W for a slightly larger tank, or if your fish need a different temperature.

Safe use

Always keep the heater fully submerged before plugging it in. Unplug it and wait at least 10 minutes before maintenance or removing it from the water.

Warranty

AQUANEAT lists 30 days of warranty plus lifelong technical support.

Compare

For a digital readout and adjustable control in a nano size, see the hygger small betta heater. For another preset 78°F option, compare the PULACO 25W mini heater.

Who it suits

Keepers of small freshwater or saltwater tanks who want a simple, low-profile heater. Check the thermometer strip daily for the first week to confirm the tank holds the temperature you expect.

Place it near the filter outflow so warm water spreads evenly.