External In-Line Heater - Hydor

Unique external heater for aquariums, designed to be plumbed into the line for external canister filters or sumps. 

• For external use
• Positive Thermal Coefficient (PTC) technology which ensures maximum safety against any risk of overheating
• Suitable for marine and tropical aquariums
• High-precision electronic temperature control
• Heaters should work with any canister filter as long as the tubing size fits