The Lifegard Aquatics 50 Watt Adjustable Quartz Glass Aquarium Heater is a submersible heater safe for both freshwater and saltwater tanks from 10 to 20 gallons.
Features:
Adjustable from 68-88 F
Length: 9.05"
50 Watts. For aquariums from 10 to 20 gallons (assuming the temp needs be adjusted no more than 10 degrees)
UL Listed
Quartz glass tube with bi-metal construction
LED power light (red in heating mode, green when temp achieved & purple when outside of water)
Thermal protection. The heater will automatically shut off if outside of water.