ViaAqua Quartz Submersible Heater This elegantly designed ViaAqua Quartz Submersible Heater is made of a premium quality, break-resistant Quartz glass. It is easy to install and is available in different sizes. The heater is completely submersible, and comes with a ceramic heater core that distributes heat evenly. The heater features a temperature setting and adjustment, waterproof double insulation, and water level line. It comes with suction cups to secure it to the side of your aquarium. The heater can be used in freshwater as well as saltwater aquariums. Product Features: It is made of high quality, break-resistant quartz glass The heater is completely submersible It has a temperature adjustment control It is suitable for freshwater and saltwater aquariums The heater can be secured by suction cups Item Specifications: Set Includes: Temperature Adjustment, Waterproof Double Insulation, Temperature Setting, Water Level Line, Power Lamp (Indicate ON/OFF Cycle), Heating Element and Ceramic Heater Core (Evenly dispersed Heat) Size: 50 Watt 100 Watt 200 Watt 300 Watt Aquarium Size: 50 Watt - 13 Gallon 100 Watt - 25 Gallon 200 Watt - 50 Gallon 300 Watt - 80 Gallon Installation: Select the proper wattage heater for the aquarium. Place the heater in the aquarium where there is good water circulation. Using the two suction cups provided, affix the heater to the inside of the aquarium. NOTE: Heater must be installed below the minimum water level line located on heater Do not place the heater on the substrate Do not cover the heater with substrate. Do not place the heater in the substrate. Do not place the heater in filtration. Only place the heater in the main body of the aquarium. Attach the thermometer to the opposite side of the aquarium. Allow 10-15 minutes for the heater to acclimate to the aquarium temperature before plugging the heater into a GFCI outlet. NOTE: When plugging the ViaAqua(R) Quartz Heater into a GFCI outlet, a drip loop must be arranged by the user for each cord connecting an aquarium appliance to an electrical outlet. Verify there is a good water circulation by heating probe. Plug the heater into a GFCI outlet. Warning: Always disconnect the heater from the power supply prior to maintenance of the aquarium. When removing the heater from the aquarium the heater must be unplugged for 30 minutes prior to removal. Heater must be installed below the minimum water level line located on heater Plug only into a GFCI (Ground Fault Circuit Interrupter). The national code requires that a GFCI be used in the branch circuit supplying power to all water pumps and electrical aquarium equipment. Do not plug into an extension cord/power strip. Do not operate the heater if any of the cords are damaged. Do not operate the heater out of water.