Buy Used and Save: Buy a Used Hydor ETH 3In-Line External Aquarium Heater , 30. Buy with confidence as the . The ETH heater must be installed outside the aquarium. It can easily be installed on the delivery tube of the external filter, by cutting the tube and linking the two . The ETH In-Line Heater uses PTC, a heating technology patented by Hydor. Its heating element is made of a special polymer that has been silk printed with .
Buy the Hydor ETH 2In-Line Heater for your aquarium and read product reviews, watch videos and see detailed specs at MarineDepot. ETH stands for External Thermal Heater. This in-line heater is designed for vertical use. Shop with confidence on eBay! This Hydor ETH External Thermal Heater is a state of the art external aquarium heater , perfect for tropical tanks where water temperature must be kept high to . The 3watt heater connects to the outflow of a canister filter, evenly distributing heat throughout . No danger of damage if unit is run dry for.
The Hydor ETH 3In-Line Heater solves this problem for me.
Anyone have experience using these heaters that attach to a filter hose? Continue reading