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Hydor Theo Aquarium HeatersHydor Theo Aquarium Heater in Packaging
  • Hydor Theo Aquarium Heaters
  • Hydor Theo Aquarium Heater in Packaging
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Hydor Theo Aquarium Heaters


Patented film heating technology and unique shatterproof glass make this submersible heater practically unbreakable while maintaining a precise temperature. Features a one degree increment control knob and an on/off indicator lamp. Completely submersible heater can be used horizontally or vertically in the aquarium. UL approved. To choose the correct heater size, 3 to 5 watts are needed per gallon of aquarium water.

Watts Length
50 watt 6 1/2"
100 watt 8"
150 watt 10"
200 watt 12"
300 watt 15"
400 watt 15 1/2"
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