The Guardian Aquarium Heater

This automatic thermostat maintains consistent water temperature for no-worry heating of your aquarium. It features a pilot light indicator, clamping screw to attach the heater to the side of the tank, moisture-proof cover to protect the controls, and it extends 8″ below the water line. It works in both freshwater and saltwater aquariums and fits aquariums up to 20 gallons capacity. 100 W operation; 115 VAC. Size: 9″L x 3″W x 1 3/4″H.

The safest choice in aquarium heating. Unbreakable metal tube construction. Safety shut-off feature. Designed to pass 12 rigorous tests. Great for tanks with more aggresive fish. UL Listed.

This automatic thermostat maintains consistent water temperature for no-worry heating of your aquarium. It features a pilot light indicator, clamping screw to attach the heater to the side of the tank, moisture-proof cover to protect the controls, and it extends 8″ below the water line. It works in both freshwater and saltwater aquariums and fits aquariums up to 20 gallons capacity. 100 W operation; 115 VAC. Size: 9″L x 3″W x 1 3/4″H.