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Fluval Tronic Submersible Heaters are considered by many to be one of the best fresh and saltwater aquarium heaters on the market. These fully submersible heaters have advanced circuitry with fully calibrated control creating absolutely stable aquarium temperatures. Furthermore, they are easy-to-use and their special recessed heater coil creates optimal heat transfer for incredible efficiency.
Since there are no mechanical components, the fully electronic operation system will not lose its accuracy like mechanical units do over time. What makes this unit so special and accurate is the patented thermal sensor which continously samples the water temperature and automatically adjust for any variances. They are fully UL-Listed and have an incredible lifetime warranty.