Amazon.com : Hydor ETH 200 In-Line External Aquarium Heater, 200w, 1/2" hose : Aquarium Heaters : Pet Supplies
Hydor Aquarium Inline Heaters for sale | eBay
Hydor ETH External Thermal Heater In Line Heater
Aquariums India - HYDOR External Aquarium Heater ~~~~~~~~~~~~~~~~~~~~~~ The first compact aquarium heater that operates externally, saving interior aquarium space. Installs vertically in the return line of a canister filter or sump,