RS Electrical 100 watt( Rs-100 w)Fully Automatic Submersible, Highest Quality, Glass Aquarium Heater, suitable for almost all small to medium sized aquariums, double glass protection aquarium heater/thermostat,suitable for all fresh water fish tanks, planted tanks,brackish water tanks,salt water/marine tanks,turtle tanks,keeps stable water temperature to keep fishes healthy,disease free throughout the entire winter season and other season when weather temperature fluctuates, imported, highly durable,maintenance free, with auto on/off facility, standby light facility, temperature range from 18 to 32 degree centigrade, most trusted widely used aquarium heater/thermostat.