Thermal shatter-resistant glass and dual calibration process make this submersible heater extremely durable and accurate to +/- 1 degree F. Unit switches itself off if the heater is not properly submersed, avoiding overheating and damage. An indicator lamp lets you know when it is on. Suction-cup clamps and UL approved 6 ft. power cord come included.Lifetime warrantyFor fresh or saltwater aquariumsOffered in a variety of sizes
Instructions For Use:A complete list of installation, set up guide and important safety instructions is included with your purchase. Be sure to read and follow all safety precautions and keep instructions on hand for future reference. Set-up Guide: Attach suction cups to heater. Do not place suction cups over the heating element portion of the heater. Set heater temperature; make sure of the required temperature for your specific setup. Install heater horizontally or vertically by pressing suction cups against surface. Choose a mounting area where water circulates continuously. No part of the heater should touch aquarium gravel or decoration. Allow heater to be submerged in water for a minimum of 30 minutes prior to plugging in appliance. Once submerged for 30 minutes create a drip loop and plug into electrical outlet. Allow heater to run for 24 hours at the original setting and then adjust temperature as needed. Caution- never operate heater without rubber protective guard.