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The Finnex Glass Heater (25 watt to 300 watt), is made of thermal resistant glass, is compact and easy to hide, has a safety shut off valve, a heat indicator and is energy efficient. This heater keeps the water temperature within 2 degrees F of the set value, reducing the risk of Marine Ich, while providing a healthy and safe tank environment. The safety shut-off valve will cut off the power automatically if it senses air. For example, if the heater is accidentally removed from the water. This is accomplished through a built-in temperature sensor. The heater is an extremely important component of your system. Tank temperatures fluctuate, rising during the day and falling at night. A great heater will maintain the water temperature at the set value.