Aquarium Heater Adjustable Submersible USB Mini Fish Tank Heater with Digital Display Temperature Controller 20W 25W

Keep your fish healthy and comfortable with the Aquarium Heater Adjustable Submersible USB Mini Heater. Designed for nano and mini tanks up to 4L, this compact yet powerful heater provides precise temperature control from 18°C to 34°C (64.4°F – 93.2°F). With a digital display and external temperature controller, it ensures your aquatic pets always live in the ideal environment.

Key Features

• Accurate Temperature Control – Adjustable between 18°C–34°C with 0.1°C precision for consistent water conditions.

• Compact Design – Mini size (7 × 2 cm), perfect for small aquariums without taking up space.

• Durable Heating Core – Made with nickel soldering electric heating wire and black gold sand filling for efficient, even heating.

• USB Powered – Convenient and portable, easy to use with power banks, adapters, or USB hubs.

• Freshwater & Saltwater Compatible – Safe for a wide range of aquariums, corrosion and acid/alkali resistant.

• Energy Efficient – Heats quickly and maintains stable water temperature while saving power.

Why Choose Our Aquarium Heater
Unlike bulky aquarium heaters, this mini USB fish tank heater is tailored for small tanks, betta fish, and nano aquariums, providing steady warmth without disturbing your setup. It’s the perfect choice for aquarists who value precision, convenience, and compact design.

Perfect For

• Nano fish tanks (up to 4L)

• Betta fish tanks

• Small freshwater & marine aquariums

• Mini desktop aquariums