The THEO heater has all the essential features for the precise and safe maintenance of the water temperature in your aquarium. The exclusive technology used and the high quality of the components guarantee a long life. The heater is submersible, anti-thermal shock, highly resistant and features a graduated scale for precise temperature regulation. It can be positioned horizontally or vertically.

Slim Heater

The Slim Heater will increase the water temperature of mini aquariums up to 15 gallons a few degrees compared to the room temperature. They can be positioned in glass, acrylic or plastic bowls and aquariums.


Heating cable guarantees regular and even heating. It generates a slow water circulation through the material on the bottom of the tank, thus creating the natural effect of waterbearing stratum. Works safely completely submerged in water or in a dry habitat. The double silicon insulation guarantees total safety.