The Aquarium Systems Visi-Therm Submersible Automatic Aquarium Heater is a 50-watt heater specifically designed for tanks with a capacity up to 12 gallons. It is suitable for all water types and comes from the trusted brand Aquarium Systems. This submersible heater is fully automatic and has been tested for reliability, making it a safe and efficient choice for maintaining the optimal temperature in your aquarium. Keep your fish healthy and thriving with this quality aquarium heater.