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HINTS: Do not use Equilibrium™ when replacing evaporated water
At the end of the dormancy period
To a point
Silent operation
Hydor Ext Heater 200w 16/22mm ESV HINTS: Do not use Equilibrium™The Hydor External Thermal Heater is the first unique external heater for aquariums 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. All the ETH range are suitable for tropical and marine aquariums. It