Hydor ETH Heaters MUST NOT be used when there is no flow of water through the heater. When undertaking water changes Hydor recommend that the heater is turned off and unplugged from the power socket at least 30 minutes before any waterchange. The Heater can ONLY then be turned back on when the Aquarium is full and the heater is completely submerged.
Do I need to turn the Heater OFF when I am doing a water change?
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