A 300w aquarium heater from Tetra for larger fish-tanks up to 450 litres. Part of the Tetratec range that features products with not only exceptional quality and reliability but also fantastic value for money. Features: Automatic Safety shut-off to prevent damage. Accurate temperature setting from 19?C to 31?C. Temperature steps of 0.5?C. Borosilicate 2mm thick shock-proof glass tube. On/Off light. Waterproof and fully submersible. Tropical and Marine Safe.