Hydor ETH its the first and unique external Heater for aquariums with the exclusive PTC (Positive Thermal Coefficient) technology. The self-limiting PTC heating element guarantees maximun safety against any risk of overheating.https://www.aquaristikshop.com/aquaristic/Hydor-Heater-for-external-filters-ETH/548090/
- Pablo R. wrote about Hydor Heater for external filters ETH in 2017:
Bought this heater a year ago and I am very happy with it. It is easy to use, it hides well in the back of the aquarium and is easy to calibrate. Clears the vision of the aquarium as the heater is now out from it. The only "black point" is the subtle noise the heater makes turning on and off.
Hugo S. wrote about Hydor Heater for external filters ETH in 2016:
Bought this heater and until know i am very happy with it. It is very accurate and practical, it hides well in the back of the aquarium and is easy to calibrate. For me the only down side is the noise the relay makes turning the heater on and off, taking that away i am very happy with it.
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