25 Watt, Features PTC patented thermal technology which makes it super safe. UL Listed. Specially engineered shatterproof glass. Precise micro-switch technology makes it highly accurate.
- Highly accurate micro-switch technology keeps temperature to within +/- 1 degrees F
- Patented PTC heating system guarantees safe operation
- Fish tank water heater suitable for freshwater, marine and tropical aquariums
- Made from specially engineered shatterproof glass
- May be vertical or horizontal - suction cups secure the aquarium water heater's position in your tank
- Completely submersible unit - power cord measures 6 feet in length
Keep your aquarium at the perfect temperature with the Hydor THEO (UL) Submersible Aquarium Heater. This sleek fish tank water heater is easy to use and install. Orient your aquarium water heater either vertically or horizontally depending on your needs or preferences. The graduated scale clicks as you dial in to your desired setting, letting you control your water temperature with ease. Choose an ideal temperature between 68-91°F; the Hydor THEO fish tank water heater will maintain your tank’s temperature to within +/- 1°F of what you set. The Hydor THEO (UL) Submersible Aquarium Heater uses PTC patented thermal technology, making it one of the safest heating units around. The PTC (Positive Thermal Coefficient) heating element prevents this heater from building up excessive heat if run dry, eliminating the risk of breaking the glass tube. Instead, if the thermostat senses an increase in heat, the aquarium water heater will automatically shut off. Moreover, the glass used in this fish tank water heater is designed to be both shatter-resistant and shock-resistant. No accessories are required to safely and properly use this aquarium water heater. The Hydor THEO (UL) Submersible Aquarium Heater comes with suction cups for secure placement and a 6 foot power cord. The Hydor THEO fish tank water heater is approved for use by Underwriters Laboratories, a firm approved for safety testing by the Occupational Safety and Health Administration (OSHA). The Hydor THEO can be used in freshwater, marine and tropical aquariums. An external thermometer (sold separately) is recommended to help you monitor the actual temperature of your tank water.