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Aquarium Heaters: Hydor Theo Submersible Heaters
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Hydor 400 Watt Theo Aquarium Heater
Hydor 400 Watt Theo Aquarium Heater
Usually Ships in 1 to 2 Business Days
Our Price: $25.00 In Stock!

Hydor Theo 400 Watt Aquarium Heater is a fully submersible, shatter-proof  glass aquarium heater.
  • Maximum security: THEO is shock resistant thanks to the PTC heating element and the shatterproof glass tube
  • Free positioning in aquarium with supplied suction cups
  • Self-limiting: the patented PTC heating system guarantees operation in complete safety because in case of dry running there is no danger for damage
Hydor mini heater hydor mini 15 watt aquarium heater hydor mini aquarium heater 15 hydor mini aquarium heater
Hydor Mini Aquarium Heater, 15 Watt
Usually Ships in 1 to 2 Business Days
Our Price: $13.40 In Stock!

The Hydor 15 Watt Mini Aquarium Heater will raise the temperature of a 5 gallon aquarium 5 degrees F and a 10 gallon aquarium 4 degrees F. NOTE: The temperature setting can not be adjusted. This 6.5" X 2.5" X .25" heater can be completely submersed and can even be used when hidden under the gravel. It can be used in glass and acrylic tanks and will not cause damage or be damaged if left running dry.
Hydor mini heater hydor mini 7.5 watt aquarium heater hydor mini aquarium heater 7.5 hydor mini aquarium heater
Hydor Mini Aquarium Heater, 7.5 Watt
Usually Ships in 1 to 2 Business Days
Our Price: $11.75 In Stock!

The Hydor 7.5 Watt Mini Aquarium Heater will raise the temperature of a 2 gallon aquarium 5 degrees F and a 5 gallon aquarium 4 degrees F. NOTE: The temperature setting can not be adjusted. This 5.7" X 2.3" X .25" heater can be completely submersed and can even be used when hidden under the gravel. It can be used in glass and acrylic tanks and will not cause damage or be damaged if left running dry.
Hydor Theo 100 Watt Aquarium Heater
Hydor Theo 100 Watt Aquarium Heater
Usually Ships in 1 to 2 Business Days
Our Price: $19.15 In Stock!

Hydor Theo 100 Watt Aquarium Heater is a fully submersible, shatter-proof  glass aquarium heater.
  • Maximum security: THEO is shock resistant thanks to the PTC heating element and the shatterproof glass tube
  • Free positioning in aquarium with supplied suction cups
  • Self-limiting: the patented PTC heating system guarantees operation in complete safety because in case of dry running there is no danger for damage
  • Temperature range: 70-94 degrees Fahrenheit
Hydor Theo 200 Watt Aquarium Heater
Hydor Theo 200 Watt Aquarium Heater
Usually Ships in 1 to 2 Business Days
Our Price: $21.45 In Stock!

Hydor Theo 200 Watt Aquarium Heater is a fully submersible, shatter-proof  glass aquarium heater.
  • Maximum security: THEO is shock resistant thanks to the PTC heating element and the shatterproof glass tube
  • Free positioning in aquarium with supplied suction cups
  • Self-limiting: the patented PTC heating system guarantees operation in complete safety because in case of dry running there is no danger for damage
  • Temperature range: 70-94 degrees Fahrenheit
Hydor Theo 300 Watt Aquarium Heater
Hydor Theo 300 Watt Aquarium Heater
Usually Ships in 1 to 2 Business Days
Our Price: $24.50 In Stock!

Hydor Theo 300 Watt Aquarium Heater is a fully submersible, shatter-proof  glass aquarium heater.
  • Maximum security: THEO is shock resistant thanks to the PTC heating element and the shatterproof glass tube
  • Free positioning in aquarium with supplied suction cups
  • Self-limiting: the patented PTC heating system guarantees operation in complete safety because in case of dry running there is no danger for damage
  • Temperature range: 70-94 degrees Fahrenheit
Hydor Theo 50 Watt Aquarium Heater
Hydor Theo 50 Watt Aquarium Heater
Usually Ships in 1 to 2 Business Days
Our Price: $17.50 In Stock!

Hydor Theo 50 Watt Aquarium Heater is a fully submersible, shatter-proof  glass aquarium heater.
  • Maximum security: THEO is shock resistant thanks to the PTC heating element and the shatterproof glass tube
  • Free positioning in aquarium with supplied suction cups
  • Self-limiting: the patented PTC heating system guarantees operation in complete safety because in case of dry running there is no danger for damage
  • Temperature range: 70-94 degrees Fahrenheit