100W aquarium heater is suitable for 10-20 gallon freshwater/saltwater aquariums, turtle tanks, betta tanks and planted tanks. Convenient Digital Display -- LED digital readout is convenient and accurate, displaying real time water temperature and indicator light.
100W aquarium heater is suitable for 10 to 20 gallons aquariums,Length - 9",voltage 110-120V, power cord is 6ft, please choose the right wattage aquarium heater according to our size chart. It shows an area to adjust the temperature.

YukiHalu Small Submersible Aquarium Heater, Adjustable Mini Fish Tank Heater 25W 50W 100W 200W 300W with External Temperature Controller, LED Display, Used for 5/10/20/40/60 Gallons (50 Watts).

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100W DaToo Aquarium Heater Reliable Heat for 1020 Gallon Tanks. Keep your fish comfortable year-round with the 100W DaToo Aquarium Heater, ideal for 1020 gallon freshwater tanks.

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Our Top Small Aquarium Heater Picks. Mini Aquarium Heater with Digital Display Thermostat (10W 1 Gallon).Water Type Compatibility:Freshwater or saltwater. Display/Indicator Type:Red/green LEDs (stair-shape heating).
Mini Submersible Aquarium Heater, Heater for Fish Tank Turtle Tank 8-99 Gallon, Saltwater and Fresh Water with Temperature Controller (25-300W).
What Heater Size is Right for a 20-Gallon Aquarium? A 20-gallon aquarium requires approximately 100 watts of heat, so you would need either two, 50-watt heaters; or one, 100-watt heater.