Maintain the ideal water temperature in your aquarium with Marineland Precision Submersible Heaters. These heater giving you precise temperature control with a click of a dial. Great heating contorl for both freshwater and marine aquariums.
 
This 200 watt heater is for aquariums up to 55 gallons. The adjustable temperature dial allows you to set the temperature 1 degree with every click. Adjustable temperature dial clicks through each degree for accuracy.  A thermal switch automatically turns off past max preset and resets once the temperature lowers.  With an advanced mica core heating element for efficient heat transfer and enhanced durability.  A clear three position window provides a clear view of the temperature level selected.