Our Flow Heater is the first one featuring a Smart Heating System (SHS) � a smart power adjustment technology. The microprocessor adjusts the heating power to maintain the desired temperature in the aquarium. This translates into the smooth operation of the heater � without temperature surges in the aquarium and, by the same token, without stressing its inhabitants. With the electronic thermostat, the LED display shows not only the programmed but also the current water temperature.