Hydor Mini Aquarium Heater 7.5 Watt for tanks up to 5 gallons
MINI heater 7.5 Watt for small aquariums and fish bowls up to 20 liters (5 gal)

The Hydor Mini Heater is specially designed for small aquariums and fish bowls up to 5 gallons. Easy installation and quick maintenance. Perfect for mini-tanks due to very compact size. Safe and reliable thanks to the patented PTC (Positive Thermal Coefficient) film heating element. Ideal for use in glass or acrylic tanks. The Mini Heater can be completely buried within the gravel if desired. As with any heating device, it is recommended that the temperature be monitored by the use of a thermometer. If the ambient room temperature rises above 76 F or other preferred temperature, simply remove or unplug the heater until needed again. For use in freshwater and marine aquariums.

Features:
Extra small: easy to hide in mini-tanks and bowls.
Extra safe even under gravel.
Completely submersible, ideal for use in both glass and acrylic tanks.
No damage if left running dry.
Helps increase by a few degrees Celsius/Fahrenheit the water temperature of mini aquariums compared to the ambient/room temperature where it is positioned.
Two year manufacturer`s warranty.