The manufacturer informs: 

Ista External Heater, heating element with digital setting to be mounted on the delivery pipe of the external filter

Heating system that does not take up space inside the tank, with a much better optical effect, as is mounted on the discharge pipe of the external filter or a recirculation or re-surfacing pump.

The 2-line digital display allows you to keep both the temperature in the water and the set temperature to be reached in view at all times.

• comes up to temperature quickly thanks to the thermal glass structure
• external positioning for easier installation and maintenance
• system with inlet and outlet sensor for precise temperature measurement

In addition, the heater is equipped with an auto-off safety system that goes into operation in one of the following cases:

• the temperature measured is above 36°C
• the measured temperature is more than 3°C higher than the set temperature
• the temperature difference detected by the two sensors is more than 5°C

Tips for choosing according to your aquarium: