Aqueon Preset Aquarium Heaters require no adjusting! The preset temperature has been calibrated to 78°, appropriate for most tropical fish. This unit is fully submersible, constructed of shatter-resistant quartz glass and features an automatic safety shut-off to avoid overheating. The heaters include suction cups and can be placed vertically or horizontally within the aquarium.  An LED indicator light displays red when actively heating.

• Preset to 78°, accurate to +/- 1°
• No adjustment required
• Shatter resistant
• Auto shut-off
• LED light turns on when aquarium water is being heated
• 50W Ideal for aquariums up to 20 gallons
• 100W Ideal for aquariums up to 30 gallons
• 150W Ideal for aquariums up to 55 gallons