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Hydor In-Line External Heater - Original ETH

  • 5999

The Hydor ETH external in-line Heaters are the first aquarium heaters designed with the exclusive PTC technology. The self-limiting PTC heating element guarantees maximum safety against any risk of overheating. The ETH must be used in a vertical manner for correct operation. For most common application, it is designed to be installed on return lines coming from canister filters, however the ETH is easily adapted for use in almost any situation where heated aquarium water is required, such as with wet/dry sump pumps. 

The ETH heats with high efficiency by means of an internal heat pump system that avoids temperature variations. For use in freshwater and marine aquariums. Fits most canister filters such as the Hydor Prime, the Rena Filstar, Eheim canisters, and the Fluval canisters with the use of a short section of tubing to complete the connection.




  • Suitable for marine and tropical freshwater aquariums
  • Easy and safe to use
  • High precision electronic temperature control
  • For use with external canister filter
  • Fits 1/2 inch or 5/8 inch hose depends on the model
  • Silent operation



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