Reliable precise and easy-to-use aquarium heaters. Tropical freshwater and marine fish require a stable temperature of around 24-27›C in order to remain healthy and in good condition. The TetraTec HT range of heaters maintain a constant temperature via an in-built thermostat making it easy to provide the correct conditions. -Easy-to-set temperature control allows adjustments of 0.5›C within range of 20›C - 32›C.-Extra long 2.5m mains cable for easy fitting.-Safet Shut-Off turns heater off if accidently run dry.-Can be fully submerged and positioned horizontally.-Electronic regulator for extra relability and safety.-Extra thick heat-resistant borosilicate glass for peace of mind.-TUV/GS tested - safety and reliability assured.