Mini Fish Tank Submersible Heater 20W For 1 To 5 Gallons With Digital Display Controller, Adjustable Temperature, Beep Alarm, Low Water Level Shutdown, And Overheat Protection, Desktop Betta Aquarium Heater

Single 20W Submersible Heater for 1-5 Gallon Tanks
✔️ 20W heater for 1-5 gal; adjustable 59-93°F; digital display

This compact nano heater is built for small tanks (1-5 gallons) and desk-friendly setups. It’s ideal for Betta tanks and shallow habitats, offering a clear digital readout, external temperature control, and built-in safety features to protect fish and equipment.

Component	Dimension	Metric
Heating element	4 in × 1 in	102 mm × 25 mm

✅ 20W power for nano tanks (1-5 gal)
✅ External thermostat with digital display
✅ Beep alarm and fault prompts for faults or overheating
✅ Low water level shutoff and auto overheat protection
✅ Memory function preserves set temp after power loss

💡 What is a compact submersible heater used for in 1-5 gallon nano tanks?

This handy heater keeps tiny aquariums warm and stable. - Maintains a steady water temperature for small fish - Handy for desk setups and nano tanks - Helps prevent stress from temperature swings - Easy to install with two suction cups