Compact 5W USB Aquarium Heater — stable, energy-efficient warmth for small tanks Why you need it Maintains a consistent, warm environment for small aquariums and bowls where large heaters are impractical. Low power draw reduces ongoing electricity cost and lets you run the heater from a PC, power bank, or USB wall adapter. Built-in low-pressure thermostat provides stable, accurate temperature control for small water volumes, helping reduce stress during acclimation or recovery. Key features and benefits 5W energy-efficient operation: provides steady heat while minimizing electricity use. Low-pressure thermostat: automatic, reliable temperature regulation designed for small tanks and bowls. USB powered: works with a computer USB port, power bank, or USB wall adapter for flexible placement and portable use. Compact, tabletop-friendly design: unobtrusive in nano tanks and desktop setups; easy to position. Simple installation and operation: plug in, place in the tank, and the thermostat handles temperature control. Reliable warmth for small setups: ideal for maintaining stable conditions in low-volume aquaria. Compatibility and performance Designed specifically for small tanks, nano setups, and bowls where conventional heaters are oversized. USB power gives wide compatibility with common USB power sources; use a USB port or adapter rated for continuous output. Compact profile fits neatly in confined spaces and on tabletops without dominating the setup. Typical use scenarios Desktop nano tanks or betta bowls at home or in the office where space and power options are limited. Quarantine or hospital tanks during transfers, acclimation, or recovery to keep fish at a steady, warm temperature. Portable warmth for travel, classrooms, or temporary setups using a USB power source such as a power bank. Practical notes Best suited for low-volume aquariums and bowl-style setups; performance depends on tank size and ambient conditions. Use with an appropriate USB power source and place the heater where it will circulate water for even heating. Simple, compact, and energy-efficient solution when you need reliable warmth in small aquaria.