THEO UL Aquarium Heaters from Hydor

The health of your fish depends on reliable, consistent temperature control. These shatterproof submersible heaters maintain temperature with a precise micro-switch that clicks in 1° F increments. An indicator lamp lets you know when the heater is on. To avoid overheating and damage, Theo switches itself off when not fully submersed. Heaters meet UL standards for safety. Suction-cup clamps included. 5-1/2 ft. cord. Safe for fresh or saltwater use. Made in Italy. Additional Performance Features: Adjustment knob Graduated scale Setting indicator Can be utilized either vertically or horizontally Minimum water level line Indicator lamp Shatterproof glass