Submersible aquarium heaters made with glass tubes could break in your fish tank. With the ETH in-line fish tank heater, you never have to worry about a broken heater in your fish tank again. The innovative, worry-free design connects directly to the tubing of your canister filter or sump so there is no danger at all. A state-of-the-art PTC system combined with a polymer sheet silk screened with heating ink (similar to your car's windshield defroster) allows the heater to be left on without water for a short time without damage. Also includes a highly accurate, adjustable heating control.

ETH 200 In-Line Heater for 12mm or 1/2 in. Tubing - 200W

ETH 201 In-Line Heater for 16mm or 5/8 in. Tubing - 200W

ETH 300 In-Line Heater for 16mm or 5/8 in. Tubing - 300W