hygger Small Aquarium Betta Heater with Digital Display

The hygger Small Aquarium Betta Heater (model HG-031) is a mini submersible heater with an LED digital display and an external temperature controller. The series comes in 10W, 25W, 50W and 100W for tanks up to 5, 10, 16 and 26 gallons respectively. This page covers the 10W and 25W sizes.

Thumb size

The heater body is only 4.13 (10.5cm) long. In a nano or betta tank, a full-size heater takes up a lot of space and is hard to hide. This one tucks behind a plant or into a back corner.

Range and control

The 10W version has a temperature range of 59-93°F and suits tanks of 1 to 5 gallons, fresh or marine, glass or acrylic. It also works in small turtle tanks. The controller sits outside the tank with an LED display showing water temperature in real time, so you can adjust settings without wet hands.

Protection

The heater is made of 2mm thickened quartz glass to resist breakage and corrosion. If water temperature exceeds 95°F, or the water level drops below the minimum line, the heater stops and the controller shows an error code: HH for high temperature and E1 for out of water.

Choosing a size

• 10W: up to 5 gallons
• 25W: up to 10 gallons
• 50W and 100W: larger sizes up to 16 and 26 gallons

In a cold room, step up one size.

Safe use

Unplug the heater before cleaning the tank or changing water. Place it where filter flow passes over it to spread heat evenly.

Compare

For a preset heater with no controls at all, see the PULACO 25W mini heater. For larger tanks, the hygger 100W heater is a bigger option from the same brand.

Who it suits

Betta and nano keepers who want adjustable temperature, a live readout and safety cutoffs in a very small heater.