Reliable heating for freshwater and saltwater tanks The hygger Submersible Aquarium Heater is designed for dependable, adjustable warmth in small to mid-size tanks

Available in 100W, 150W, 200W and 300W, it covers tanks from roughly 20 to 48 gallons, depending on the model

The compact length (about 9

69 inches for the stronger model) makes it easier to position without crowding your decor

Use the wattage in our size chart to balance energy use and heat distribution

Operating with an external temperature controller, you can set a target temperature without reaching into the water

The controller also displays both the current water temperature and the set temperature, helping you monitor conditions at a glance

With simple two-button control, fine-tuning the heat becomes straightforward during routine maintenance or after water changes

Safety and reliability are built in

The heater includes out-of-water protection that stops heating if the unit is not fully immersed, and a fault indicator on the controller to alert you if there’s an issue

An overheating safeguard shuts the heater off when temperatures rise too high, and the last setting is preserved so you can resume quickly after power interruptions

Designed for demanding environments, the heater uses a durable quartz glass body and a heat-conducting assembly engineered for efficient energy use

The compact, rugged design helps it stand up to daily aquarium routines, whether you’re caring for a Betta, a community tank, or a nano reef setup

These features come together to flexible, responsive heating that can help you maintain stable conditions for your aquatic life

Practical tips for results: pair the heater with the appropriate external controller, monitor during first days of use, and choose a wattage according to your tank size

The setup is compatible with both freshwater and marine environments, and is suitable for species that appreciate stable temperatures

While outcomes vary, the right heating strategy can support consistent, comfortable conditions for your fish, plants, and invertebrates

What’s in the box Each model arrives with the heater and controller, designed for easy adaptation to your tank’s setup and routine maintenance

External temperature controller for safe adjustment outside water LED temperature display to monitor current and set values Out-of-water protection to prevent heating when not fully immersed Overheat protection and memory function for quick resuming after power loss Durable quartz glass construction for long-lasting performance I for freshwater and saltwater tanks Suitable for betta tanks, community tanks, and small ponds Quiet operation and simple maintenance FAQ Q: What tank sizes is the hygger Submersible Aquarium Heater suitable for

A: Available in 100W, 150W, 200W, and 300W; choose wattage based on tank size per our chart

Q: How does the external temperature controller work

A: Mount outside the tank; set the target temp and monitor current temp on the display