The Hydor THEO Heaters provide the proper temperature needed to make your home aquarium flourish with the most advanced heating technology available. THEO heaters are designed with a peculiar cylindrical shape that renders them practically shatterproof. Fully submersible, THEO heaters function with the PTC (Positive Thermal Coefficient) heating element, a special polymer sheet silk screened with heating ink (like your car's windshield defroster), that enables them to run dry for a short time without damage. The unit comes complete with an easy to read temperature dial that make it the simplest, yet safest aquarium heater available. Can be used vertically or horizontally.
Size: Unit is 3/4" diameter x 8.9" long (100 Watts, Great for aquariums 14 – 26 gallons)