Hygger Submersible Aquarium Heater — 100W–300W with External Controller & LED Display

Compact, versatile heater for small to mid-sized tanks

The Hygger submersible aquarium heater brings dependable warmth to a slim 7.6 inch design. Available in 100W, 150W, 200W, and 300W, it suits a range of setups from freshwater communities to saltwater tanks and betta displays. By selecting the right wattage, you can tailor the heat to your tank and room conditions, reducing clutter and simplifying maintenance. This single unit is designed to blend into the aquarium while delivering steady, reliable warmth for daily life in your underwater world.

Whether you keep a nano reef, a tropical community tank, or a small pond setup, this heater is meant to be a straightforward, dependable option that supports your aquarist routine without taking over the scene. Its compact profile helps it stay out of sight behind decor and plants while delivering consistent results when you need them most.

Smart control that keeps your tank stable

The external temperature controller enables safe, hands-free adjustments. It shows two readings at a glance—current water temperature and the target temperature—making it easy to monitor progress while you observe your tank’s inhabitants. With a practical 59–93 °F range, you can fine-tune temperatures to suit different species and seasonal changes. The SET button provides quick access to switch between readings and confirm changes, so you can keep the focus on the fish and plants rather than fiddling with hardware.

• External controller for safe adjustment without wet hands
• LED display clearly shows current vs set temperature
• Wide temperature range to accommodate diverse setups
• Easy switching between readings for quick tuning

Built to withstand regular use

Safety and reliability are built into the design. The heater includes out-of-water protection that stops heating when water is not present, and overheating protection with fault signaling to alert you if something needs attention. When power returns after an interruption, the unit resumes at the last setting, avoiding sudden temperature shifts. The construction combines durable quartz glass with a nickel-chromium heating wire that efficiently converts electrical energy into heat and promotes uniform warmth across the water column.

• Out-of-water protection with fault signaling
• Overheat protection and last-setting memory
• Durable quartz glass and efficient heating wire for longevity

Practical tips for selection and installation

Choose wattage based on tank volume, typical room temperature, and the desired stability for your aquatic inhabitants. Ensure the heater is fully submerged during operation and place the external controller within easy reach for quick adjustments. The red indicator denotes heating, while the green indicator signals a constant, target temperature, helping you interpret status at a glance. With proper setup, Hygger offers a simple path to a consistently comfortable environment for your fish, plants, and décor.