Aquatop Aquarium Submersible Glass Heater

Keep your aquatic creatures happy, healthy and comfortable with the Aquatop Submersible Glass Aquarium Heater. This heater features suction cups for easy installation and a very visible temperature setting.
50-watt heater maintains constant, stable aquarium temperatures
Simple to set and adjust temperature
High quality, insulated glass construction
Specifications:
50 Watt: 9" (Aquariums up to 13 Gallons)
75 Watt: 9" (Aquariums up to 20 Gallons)
100 Watt: 10.5" (Aquariums up to 25 Gallons)
200 Watt: 12.5" (Aquariums up to 50 Gallons)
250 Watt: 12.5" (Aquariums up to 65 Gallons)
300 Watt: 14.5" (Aquariums up to 75 Gallons)