The Newa Therm VTX 400W is a completely submersible automatic aquarium heater. With a sensitive thermostat and efficient heating element working together to maintain a uniformed temperature that you can set with the temperature adjustment. The thermometer temperature indicator makes it easy to set, read and maintain the temperature in your fish tank up to 26C. A thermal shock-resistant quartz tube with mechanical protection also makes the Newa Therm heaters some of the most robust heaters out there. The Newa Therm VTX 400W is suitable for aquariums up to 250 litres Features: Up to 26C. Temperature adjustment feature. Waterproof double insulation. Visible temperature setting. Thermal shock resistant tube. NEWA Protection - Mechanical protection. 410mm length & 23mm diameter.