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Fully submersible, easy-to-use electronic heater for fresh and saltwater aquariums * Calibrated control for consistent aquarium temperature * Recessed heater coil improves heat transfer to ceramic inner core Electronic aquarium heater uses advanced circuitry to ensure safe and reliable heating. Its electronic operations system means there are no mechanical components that can wear out and potentially become less accurate over time. Fast Heat Technology quickly achieves optimum temperature by continuously heating until temperature is reached. Patented Thermal Sensor continuously samples water temperature directly through the glass of the heater tube, resulting in accurate water temperature data for accurate heating. UL-Listed.

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