The Hydor ETH External Thermal Heater is the first unique external heater for reservoirs with the exclusive PTC (Positive Thermal Coefficient) technology.

The self-timing PTC heating element guarantees maximum safety against any risk of overheating and blowing. This extra safe element and the durable materials used mean that this heater is both energy efficient, safe and long lasting.

The ETH heater can only be used vertically, it is ideal to use in a canister filter or in a sump. It is very easy to connect and use, making this range of heaters super convenient and effective.

• Comes with PTC (Positive Thermal Coefficient) technology.
• Easy to connect to any canister filter, or use in sump.
• Integrated signal light
• Guarantees maximum safety against any risk of over-heating.
• High precision electronic temperature control with signal light.
• Built with solid self-extinguishing materials for extra safety.
• 2 year guarantee

16mm (5/8 inch) hose fitting.