The Marineland 100 Watt Visi-Therm Submersible Heater is perfect for freshwater and marine aquariums.

Features:

• 10.25" Tall
• For aquariums up to 29 gallons
• Gives precise control to accurately set temp to + or - 1F with every "click"
• Advanced mounting bracket securely attaches to glass and provides 3 window positions to view temp display from multiple angles
• LED lights when heater is operating
• Easy-to-view sliding scale tells the exact temperature setting
• Double strength glass casing for extra durability