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Hydor Theo 300 Watt Aquarium Heater is a fully submersible, shatter-proof glass aquarium heater.- Maximum security: THEO is shock resistant thanks to the PTC heating element and the shatterproof glass tube
- Free positioning in aquarium with supplied suction cups
- Self-limiting: the patented PTC heating system guarantees operation in complete safety because in case of dry running there is no danger for damage
- Temperature range: 70-94 degrees Fahrenheit
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