Key Features Precise Heat Control An integrated control light clearly shows when heater is heating correctly Accurate Thermostat 2 Year Guarantee Simple and easy to use Internal Aquarium Heater from Eden. It provides accurate water temperature readings thanks to its thermostat system that reacts only to the water temperature and not to the heating element within the unit. For added control there is also the added ability to manually calibrate the thermostat should it be needed. Eden is a brand from the prestigious Oase manufacturing group, well know for premium pond products Can heat water by the following amounts from the room temperature of the tank location: 300 Litres Tank - 5c 250 Litres Tank - 10c 125 Litres Tank - 15c Power: 250 Watt Length: 370mm Cable Length: 1.5m Fixing bracket supplied