Under Gravel Slim Heater - Hydor

Helps increase the water temperature of pico aquariums by a few degrees.

• 100% safe
• No glass components
• Easy maintenance
• Submersible
• Under gravel
• Cord connection at 90 degrees to heater

4 watt:

• For 1 to 2.5 gallon tanks
• Heater is round with approx. 9cm (3.5") diameter
• Elevates water temperature by approx. 5 to 10 degrees F

7.5 watt:

• For 2 to 5 gallon tanks
• Round: 9cm (3.5") diameter
• Elevates water temperature by approx. 5 to 10 degrees F

15 watt:

• For 5 - 10 gallon tanks
• Round: 8cm 
• Elevates water temperature by approx. 5 to 10 degrees F