Buying an adjustable and reliable heating system for the aquarium is essential for some, especially tropical fish species. The thermoregulation of most underwater creatures is directly linked to the water temperature. If the water temperature drops or rises, many species instinctively swim to the warmer regions. In an aquarium, this is only possible to a limited extent. A reliable control heater allows the water to be raised above room temperature. Some species only feel comfortable at tropical 25°C and above. Of course, this temperature must also be reached during the cold season. The Tetra Heater without a doubt, reach these temperatures and hold them reliable.