The Newa Therm Mini Plus 20W contains many of the features of the Mini K with a few additional upgrades These unbreakable heaters are highly efficient using just 20 Watts. The thermal-protector prevents against damage caused by thermal shock or dry use. If the heater runs dry, or is removed from the water while switched on the heater switches off. Once the heater has cooled, or when it is re-immersed it switches on again. Features: Pre set to 25?C with a thermostat inside to regulate the temperature. Thermal protector. Maintains water temperature at 25?C +-1? C. The thermostat needs no regulation. A red light indicates when the heater is running. Supplied with suction cups.