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    Hydor 150W Submersible Glass Aquarium Heater - Original Theo

    Hydor 150W Submersible Glass Aquarium Heater - Original Theo

    Theo Heater. New aquarium heater functioning with the exclusive PTC technology means that this heater will not break or damage when run out of the tank. Theo aquarium heater has all the necessary feature for safe and precise temperature maintenance of... more

    $29.53

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    Hydor 100W Submersible Glass Aquarium Heater - Original Theo (Pack of 1)

    Hydor 100W Submersible Glass Aquarium Heater - Original Theo (Pack of 1)

    Hydor 100W Submersible Glass Aquarium Heater - Original Theo (Pack of 1) more

    $20.79

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    Best Seller
    Hydor Theo Aquarium Heater, 400-Watt

    Hydor Theo Aquarium Heater, 400-Watt

    Hydor 400W Submersible Glass Aquarium Heater - Original Theo (Pack of 1) more

    $45.29 $27.69

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    Theo Heater 150 watt

    Theo Heater 150 watt

    "Patented heating element automatically turns off if water level declines Easy temperature adjustment - knob clicks at every degree change Submersible heater with shatterproof glass resists breakage Patented heating film and special shatterproof glass... more

    $24.99

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    (275,000+)
    Theo Heater 100 watt

    Theo Heater 100 watt

    "Patented heating element automatically turns off if water level declines Easy temperature adjustment - knob clicks at every degree change Submersible heater with shatterproof glass resists breakage Patented heating film and special shatterproof glass... more

    $21.99

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    (275,000+)
    Hydor Usa Inc. Theo 300 Watt Submersible Shatterproof Heater 15.5" Hy00037

    Hydor Usa Inc. Theo 300 Watt Submersible Shatterproof Heater 15.5" Hy00037

    300W submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. For aquariums 53-80 gallons.Length - 15.5 Part #: AHY00037Item Name: Theo... more

    $34.61

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    Hydor Usa Inc. Theo 300 Watt Submersible Shatterproof Heater 15.5" Hy00037

    Hydor Usa Inc. Theo 300 Watt Submersible Shatterproof Heater 15.5" Hy00037

    300W submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. For aquariums 53-80 gallons.Length - 15.5 Part #: AHY00037Item Name: Theo... more

    $34.61

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    Hydor Usa Inc. Theo 50 Watt Submersible Shatterproof Heater 7" Hy00034

    Hydor Usa Inc. Theo 50 Watt Submersible Shatterproof Heater 7" Hy00034

    50W submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. Extremely compact at 7 . For aquariums 5-14 gallons.Length - 7 Part #:... more

    $33.36

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    Hydor Usa Inc. Theo 200 Watt Submersible Shatterproof Heater 12" Hy00036

    Hydor Usa Inc. Theo 200 Watt Submersible Shatterproof Heater 12" Hy00036

    200W submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. For aquariums 26-53 gallons.Length - 12 Part #: AHY00036Item Name: Theo... more

    $34.61

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    Hydor Usa Inc. Theo 300 Watt Submersible Shatterproof Heater 15.5" Hy00037

    Hydor Usa Inc. Theo 300 Watt Submersible Shatterproof Heater 15.5" Hy00037

    300W submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. For aquariums 53-80 gallons.Length - 15.5"Part #: AHY00037Item Name: Theo... more

    $25.95

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    Hydor Theo Heater - Submersible Aquarium Heater - T11702

    Hydor Theo Heater - Submersible Aquarium Heater - T11702

    Submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. 25 Wats - 6.9" Long (2-7 Gallons) more

    $19.97

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    Hydor Theo Heater - Submersible Aquarium Heater - T11102

    Hydor Theo Heater - Submersible Aquarium Heater - T11102

    Submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. 50 Watts - 7" Long (5-14 Gallons) more

    $21.97

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    Hydor Usa Inc. Theo 200 Watt Submersible Shatterproof Heater 12" Hy00036

    Hydor Usa Inc. Theo 200 Watt Submersible Shatterproof Heater 12" Hy00036

    200W submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. For aquariums 26-53 gallons.Length - 12 Part #: AHY00036Item Name: Theo... more

    $34.61

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    Hydor Usa Inc. Theo 200 Watt Submersible Shatterproof Heater 12" Hy00036

    Hydor Usa Inc. Theo 200 Watt Submersible Shatterproof Heater 12" Hy00036

    200W submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. For aquariums 26-53 gallons.Length - 12"Part #: AHY00036Item Name: Theo... more

    $25.95

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    Hydor Usa Inc. Theo 100 Watt Submersible Shatterproof Heater 8.9" Hy00035

    Hydor Usa Inc. Theo 100 Watt Submersible Shatterproof Heater 8.9" Hy00035

    100W submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. Extremely compact at 8.9 . For aquariums 14-26 gallons.Length - 8.9 Part... more

    $33.36

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    Hydor Usa Inc. Theo 100 Watt Submersible Shatterproof Heater 8.9" Hy00035

    Hydor Usa Inc. Theo 100 Watt Submersible Shatterproof Heater 8.9" Hy00035

    100W submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. Extremely compact at 8.9 . For aquariums 14-26 gallons.Length - 8.9 Part... more

    $33.36

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    Hydor Usa Inc. Theo 200 Watt Submersible Shatterproof Heater 12" Hy00036

    Hydor Usa Inc. Theo 200 Watt Submersible Shatterproof Heater 12" Hy00036

    200W submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. For aquariums 26-53 gallons.Length - 12 Part #: AHY00036Item Name: Theo... more

    $34.61

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    Hydor Usa Inc. Theo 100 Watt Submersible Shatterproof Heater 8.9" Hy00035

    Hydor Usa Inc. Theo 100 Watt Submersible Shatterproof Heater 8.9" Hy00035

    100W submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. Extremely compact at 8.9". For aquariums 14-26 gallons.Length - 8.9"Part... more

    $24.95

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    Hydor Usa Inc. Theo 100 Watt Submersible Shatterproof Heater 8.9" Hy00035

    Hydor Usa Inc. Theo 100 Watt Submersible Shatterproof Heater 8.9" Hy00035

    100W submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. Extremely compact at 8.9 . For aquariums 14-26 gallons.Length - 8.9 Part... more

    $33.36

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    Hydor Usa Inc. Theo 100 Watt Submersible Shatterproof Heater 8.9" Hy00035

    Hydor Usa Inc. Theo 100 Watt Submersible Shatterproof Heater 8.9" Hy00035

    100W submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. Extremely compact at 8.9 . For aquariums 14-26 gallons.Length - 8.9 Part... more

    $33.36

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    Hydor Usa Inc. Theo 300 Watt Submersible Shatterproof Heater 15.5" Hy00037

    Hydor Usa Inc. Theo 300 Watt Submersible Shatterproof Heater 15.5" Hy00037

    300W submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. For aquariums 53-80 gallons.Length - 15.5 Part #: AHY00037Item Name: Theo... more

    $34.61

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    Hydor Usa Inc. Theo 50 Watt Submersible Shatterproof Heater 7" Hy00034

    Hydor Usa Inc. Theo 50 Watt Submersible Shatterproof Heater 7" Hy00034

    50W submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. Extremely compact at 7 . For aquariums 5-14 gallons.Length - 7 Part #:... more

    $33.36

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    Hydor Theo Heater - Submersible Aquarium Heater - T11502

    Hydor Theo Heater - Submersible Aquarium Heater - T11502

    Submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. 400 Wats - 15.5" Long (80-105 Gallons) more

    $29.97

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    Theo Heater 400 watt

    Theo Heater 400 watt

    "Patented heating element automatically turns off if water level declines Easy temperature adjustment - knob clicks at every degree change Submersible heater with shatterproof glass resists breakage Patented heating film and special shatterproof glass... more

    $30.99

    FREE shipping

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    (275,000+)
    Hydor Theo Aquarium Heater, 300-Watt

    Hydor Theo Aquarium Heater, 300-Watt

    Hydor 300W Submersible Glass Aquarium Heater - Original Theo (Pack of 1) more

    $99.97 $25.99

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    Hydor Usa Inc. Theo 50 Watt Submersible Shatterproof Heater 7" Hy00034

    Hydor Usa Inc. Theo 50 Watt Submersible Shatterproof Heater 7" Hy00034

    50W submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. Extremely compact at 7 . For aquariums 5-14 gallons.Length - 7 Part #:... more

    $33.36

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    Hydor Usa Inc. Theo 50 Watt Submersible Shatterproof Heater 7" Hy00034

    Hydor Usa Inc. Theo 50 Watt Submersible Shatterproof Heater 7" Hy00034

    50W submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. Extremely compact at 7". For aquariums 5-14 gallons.Length - 7"Part #:... more

    $24.95

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    Hydor Usa Inc. Theo 300 Watt Submersible Shatterproof Heater 15.5" Hy00037

    Hydor Usa Inc. Theo 300 Watt Submersible Shatterproof Heater 15.5" Hy00037

    300W submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. For aquariums 53-80 gallons.Length - 15.5 Part #: AHY00037Item Name: Theo... more

    $34.61

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    Hydor Usa Inc. Theo 50 Watt Submersible Shatterproof Heater 7" Hy00034

    Hydor Usa Inc. Theo 50 Watt Submersible Shatterproof Heater 7" Hy00034

    50W submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. Extremely compact at 7 . For aquariums 5-14 gallons.Length - 7 Part #:... more

    $33.36

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    Hydor Theo Heater - Submersible Aquarium Heater - T11402

    Hydor Theo Heater - Submersible Aquarium Heater - T11402

    Submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. 300 Watts - 15.5" Long (53-80 Gallons) more

    $27.97

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    Hydor Usa Inc. Theo 200 Watt Submersible Shatterproof Heater 12" Hy00036

    Hydor Usa Inc. Theo 200 Watt Submersible Shatterproof Heater 12" Hy00036

    200W submersible aquarium heater. UL listed. Safe and reliable. Made from specially enginereed shatterproof glass. Temperature controlled and maintained by precise micro-switch. For aquariums 26-53 gallons.Length - 12 Part #: AHY00036Item Name: Theo... more

    $34.61

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    Theo Heater 200 watt

    Theo Heater 200 watt

    "Patented heating element automatically turns off if water level declines Easy temperature adjustment - knob clicks at every degree change Submersible heater with shatterproof glass resists breakage Patented heating film and special shatterproof glass... more

    $25.99

    FREE shipping

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    (275,000+)
    Theo Heater 25 watt

    Theo Heater 25 watt

    "Patented heating element automatically turns off if water level declines Easy temperature adjustment - knob clicks at every degree change Submersible heater with shatterproof glass resists breakage Patented heating film and special shatterproof glass... more

    $18.69

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    (275,000+)
    Theo Heater 50 watt

    Theo Heater 50 watt

    "Patented heating element automatically turns off if water level declines Easy temperature adjustment - knob clicks at every degree change Submersible heater with shatterproof glass resists breakage Patented heating film and special shatterproof glass... more

    $20.99

    FREE shipping

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    (275,000+)
    Theo Heater 300 watt

    Theo Heater 300 watt

    "Patented heating element automatically turns off if water level declines Easy temperature adjustment - knob clicks at every degree change Submersible heater with shatterproof glass resists breakage Patented heating film and special shatterproof glass... more

    $28.99

    FREE shipping

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    (275,000+)

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