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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

    $26.99

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    Hydor Slim Heater 15W (Mfg# T203201)

    Hydor Slim Heater 15W (Mfg# T203201)

    Easily warm your miniature aquarium to a comfortable, hospitable temperature that helps keep your fish thriving! Fully submersible Hydor Slim Aquarium Heater feature plug-and-go design, shock-proof construction, and a sleek shape that blends in with... more

    $14.99 $10.99

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    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

    $23.99

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    Hydor 200W Submersible Aquarium Heater - Original Theo

    Hydor 200W Submersible 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

    $19.31

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    Hydor Theo 200w Submersible Aquarium Heater (with Free Thermometer)

    Hydor Theo 200w Submersible Aquarium Heater (with Free Thermometer)

    HYDOR THEO 200 Watt SUBMERSIBLE HEATER with FREE AQUARIUM THERMOMETER (Pictured) - both items new in box!Theo Aquarium heater has all the necessary features for safe and precise temperature maintenance of the water in your tank. The exclusive... more

    $35.00

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    Hydor 50W Submersible Aquarium Heater - Original Theo

    Hydor 50W Submersible 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

    $14.99

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    Hydor 25W Submersible Aquarium Heater - Original Theo

    Hydor 25W Submersible 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

    $17.99

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    Marineland Marineland Precision Submersible Aquarium Heater: 400 Watt - 18 Long - (Aquariums up to

    Marineland Marineland Precision Submersible Aquarium Heater: 400 Watt - 18 Long - (Aquariums up to

    Marineland Marineland Precision Submersible Aquarium Heater: 400 Watt - 18 Long - (Aquariums up to 125 Gallons) #ML90655 The Marineland Precision Submersible Aquarium Heater offers safe, reliable, highly accurate heating for your fresh or saltwater... more

    $80.99 $42.28

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    Hydor Theo Submersible Aquarium Heater - 200 Watt

    Hydor Theo Submersible Aquarium Heater - 200 Watt

    Hydor THEO Submersible Heater 200W Product #: HY-T11302 The first shatter-proof heater thanks to the peculiar glass tube. Maximum security: THEO is shock resistant thanks to the PTC heating element and the shatterproof glass tube. Free positioning in... more

    $29.95

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    Hydor Theo Submersible Heater 150 Watt

    Hydor Theo Submersible Heater 150 Watt

    Hydor THEO Submersible Heater 150W Product #: HY-T11602 The first shatter-proof heater thanks to the peculiar glass tube. Maximum security: THEO is shock resistant thanks to the PTC heating element and the shatterproof glass tube. Free positioning in... more

    $29.99

    FREE shipping

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    Theo Submersible Aquarium Heater - Wattage: 300

    Theo Submersible Aquarium Heater - Wattage: 300

    HYY1028: Features: -Theo submersible aquarium heater.-Shatter resistant glass.-No damage if run dry.-Easy to read scale for precise temperature setting.-Safe if freshwater or saltwater aquariums.-UL approved. Specifications: -Available in 50, 100, 200,... more

    $39.99 $31.92

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    Rakuten.com Shopping

    (1,000,000+)
    THEO SHATTERPROOF HEATER

    THEO SHATTERPROOF HEATER

    The Theo 400W Heater is perfect for uses in aquariums 80-105 gallons (300-400 liters). Product is completely submersible. Uses standard 110V outlet.Color: BlackSize: 3.5'' x 2'' x 17.5'' more

    $33.55

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    Rakuten.com Shopping

    (1,000,000+)
    Theo 150 Watt Submersible Shatterproof Heater 8.9

    Theo 150 Watt Submersible Shatterproof Heater 8.9

    Hydor THEO (UL) Submersible Aquarium Heater - High Quality Fish Tank Water Heater and Aquarium Water Heater SelectionKeep your aquarium at the perfect temperature with the Hydor THEO (UL) Submersible Aquarium Heater. This sleek fish tank water heater... more

    $27.03

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    Rakuten.com Shopping

    (1,000,000+)
    THEO Heater - 150W - Up to 40 gal.

    THEO Heater - 150W - Up to 40 gal.

    Provide your tank with the proper temperature with the most advanced heating technology available. THEO heaters are designed with a peculiar cylindrical shape that renders them virtually shatterproof. Fully submersible; THEO heaters function with the... more

    $29.99

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    THEO Heater - 200W - Up to 53 gal.

    THEO Heater - 200W - Up to 53 gal.

    Provide your tank with the proper temperature with the most advanced heating technology available. THEO heaters are designed with a peculiar cylindrical shape that renders them virtually shatterproof. Fully submersible; THEO heaters function with the... more

    $27.99

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    THEO Heater - 50W - Up to 14 gal.

    THEO Heater - 50W - Up to 14 gal.

    Provide your tank with the proper temperature with the most advanced heating technology available. THEO heaters are designed with a peculiar cylindrical shape that renders them virtually shatterproof. Fully submersible; THEO heaters function with the... more

    $28.99

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    Hydor Mini Submersible Heater: 15 Watts - (For Aquariums 5-10 Gallons) #T20301 - Aquarium Heaters

    Hydor Mini Submersible Heater: 15 Watts - (For Aquariums 5-10 Gallons) #T20301 - Aquarium Heaters

    Hydor Mini Submersible Heater: 15 Watts - (For Aquariums 5-10 Gallons) #T20301 The Hydor mini heater is a submersible aquarium heater for micro tanks and mini aquariums 5-10 gallons. Ideal for use in mini aquariums for fish that require heated water... more

    $18.99 $10.16

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    Hydor Slim Heater for Micro Tanks & Mini Aquariums: 7.5 Watt - 2-5 Gallons #T20201 - Aquarium Heater

    Hydor Slim Heater for Micro Tanks & Mini Aquariums: 7.5 Watt - 2-5 Gallons #T20201 - Aquarium Heater

    Hydor Slim Heater for Micro Tanks & Mini Aquariums: 7.5 Watt - 2-5 Gallons #T20201 The Hydor slim heater is a submersible aquarium heater for micro tanks and mini aquariums 2-5 Gallons. Ideal for use in mini aquariums for fish that require heated water... more

    $16.99 $9.99

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    Hydor THEO 400W (UL) Submersible Aquarium Heater, 400 Watts

    Hydor THEO 400W (UL) Submersible Aquarium Heater, 400 Watts

    Free Shipping on Orders Over $49!

    Hydor THEO (UL) Submersible Aquarium Heater - High Quality Fish Tank Water Heater and Aquarium Water Heater SelectionKeep your aquarium at the perfect temperature with the Hydor THEO (UL) Submersible Aquarium Heater. This sleek fish tank water heater... more

    $42.99 $35.33

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    petco.com

    (200,000+)
    Hydor Mini Heater 7.5 Watt

    Hydor Mini Heater 7.5 Watt

    Hydor 7.5 Watt Mini Heater For Tanks 2.5 - 5 GallonsMINI HEATER helps increase by a few degrees Fahrenheit/Celsius the ambient water temperature of mini aquariums compared to the room temperature where they are positioned. They are fully submersible... more

    $12.99

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    Hydor THEO 50W (UL) Submersible Aquarium Heater, 50 Watts

    Hydor THEO 50W (UL) Submersible Aquarium Heater, 50 Watts

    Free Shipping on Orders Over $49!

    Hydor THEO (UL) Submersible Aquarium Heater - High Quality Fish Tank Water Heater and Aquarium Water Heater SelectionKeep your aquarium at the perfect temperature with the Hydor THEO (UL) Submersible Aquarium Heater. This sleek fish tank water heater... more

    $25.99 $24.06

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    petco.com

    (200,000+)
    Hydor THEO 200W (UL) Submersible Aquarium Heater, 200 Watts

    Hydor THEO 200W (UL) Submersible Aquarium Heater, 200 Watts

    Free Shipping on Orders Over $49!

    Hydor THEO (UL) Submersible Aquarium Heater - High Quality Fish Tank Water Heater and Aquarium Water Heater SelectionKeep your aquarium at the perfect temperature with the Hydor THEO (UL) Submersible Aquarium Heater. This sleek fish tank water heater... more

    $36.99 $30.50

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    petco.com

    (200,000+)
    Theo Shatterproof Heater Clear 400 Watt (T11502)

    Theo Shatterproof Heater Clear 400 Watt (T11502)

    Theo Shatterproof Heater Clear 400 Watt(T11502)Features: Use In Aquariums Up To 200 Gal Completely Submersible.Ingredients: N/AColor: ClearSize: 400 Watt more

    $61.19

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    PetFenceUSA

    (250+)
    Hydor THEO Heater 400 Watt

    Hydor THEO Heater 400 Watt

    Theo 400W For Aquariums 80 105 gallons New aquarium heater functioning with the exclusive PTC (Positive Thermal Coefficient) technology.The Hydor Theo heater line features PTC patented thermal technology which makes it among the safest aquarium heater... more

    $31.49

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    MarineDepot.com

    (25,000+)
    Hydor THEO Heater 400 Watt

    Hydor THEO Heater 400 Watt

    Theo 400W For Aquariums 80 105 gallons New aquarium heater functioning with the exclusive PTC (Positive Thermal Coefficient) technology.The Hydor Theo heater line features PTC patented thermal technology which makes it among the safest aquarium heater... more

    $31.49

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    PetStore.com

    (2,500+)
    "Hydor Theo Heater 400 Watt for 80-105 Gallons (24/Cs)"

    "Hydor Theo Heater 400 Watt for 80-105 Gallons (24/Cs)"

    "Theo reservoir & aquarium heaters have all the necessary features for safe and precise temperature maintenance of the water in your tank or reservoir. The exclusive technology and the high quality of the components guarantee a long lasting product. " more

    $31.96

    FREE shipping

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    Theo Shatterproof Heater Clear 400 Watt (T11502)

    Theo Shatterproof Heater Clear 400 Watt (T11502)

    Theo Shatterproof Heater Clear 400 Watt(T11502)Features: Use In Aquariums Up To 200 Gal Completely Submersible.Ingredients: N/AColor: ClearSize: 400 Watt more

    $73.43 $61.19

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    TSCPets

    (1,000+)
    Theo 400 Watt Heater For Aquariums

    Theo 400 Watt Heater For Aquariums

    The Theo 400W Heater is perfect for uses in aquariums 80-105 gallons (300-400 liters). Product is completely submersible. Uses standard 110V outlet.Color: BlackSize: 3.5'' x 2'' x 17.5'' more

    $35.50

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    Hydor Theo Aquarium Heaters 300 watt

    Hydor Theo Aquarium Heaters 300 watt

    New aquarium heater functioning with the exclusive PTC (Positive Thermal Coefficient) technology. The first shatter-proof fish tank heater thanks to the peculiar glass tube. Free positioning in the aquarium: vertical, horizontal and completely... more

    $26.99

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    PetSolutions

    (25,000+)
    Theo Shatterproof Heater Clear 150 Watt (T11602)

    Theo Shatterproof Heater Clear 150 Watt (T11602)

    Theo Shatterproof Heater Clear 150 Watt(T11602)Features: Made For Aquariums Up To 40 Gal Completely Submersible, Safe And Shatterproof.Temperature Controlled And Maintained By A Highly Precise Micro-Switch, Ptc Element.Can Be Used Positioned Inside... more

    $49.49

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    PetFenceUSA

    (250+)
    Hydor THEO Heater 200 Watt

    Hydor THEO Heater 200 Watt

    Theo 200W For Aquariums 26 53 gallonsNew aquarium heater functioning with the exclusive PTC (Positive Thermal Coefficient) technology.The Hydor Theo heater line features PTC patented thermal technology which makes it among the safest aquarium heater... more

    $27.99

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    MarineDepot.com

    (25,000+)
    Hydor THEO Heater 150 Watt

    Hydor THEO Heater 150 Watt

    Theo 150W For Aquariums 23 40 gallons New aquarium heater functioning with the exclusive PTC (Positive Thermal Coefficient) technology.The Hydor Theo heater line features PTC patented thermal technology which makes it among the safest aquarium heater... more

    $24.99

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    MarineDepot.com

    (25,000+)
    Hydor THEO Heater 150 Watt

    Hydor THEO Heater 150 Watt

    Increasing the temperature of your aquarium water to an appropriate degree for the comforts of your fish is made easy with the Hydor Theo Heater from Pet Store. This device comes with a diameter of nine inches, which is small and light enough to be... more

    $24.99

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    PetStore.com

    (2,500+)
    Hydor THEO Heater 200 Watt

    Hydor THEO Heater 200 Watt

    When it comes to providing your marine inhabitants with an environment that is very suitable for them, one of the factors, which you need to consider, is the temperature of the water. Since many fishes love a warmer, living condition, you may want to... more

    $27.99

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    PetStore.com

    (2,500+)
    Hydor THEO UL Heater

    Hydor THEO UL Heater

    Hydor THEO UL Heater THEO aquarium heater has all the necessary features for safe and precise temperature maintenance of the water in your tank. The exclusive technology and the high quality of the components guarantee a long lasting product. 220/240V... more

    $18.99

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    Hydor 200W Theo Aquarium Heater

    Hydor 200W Theo Aquarium Heater

    Theo reservoir & aquarium heaters have all the necessary features for safe and precise temperature maintenance of the water in your tank or reservoir. The exclusive technology and the high quality of the components guarantee a long lasting product.... more

    $43.53

    FREE shipping

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    Hydor 400W Theo Aquarium Heater

    Hydor 400W Theo Aquarium Heater

    Theo reservoir & aquarium heaters have all the necessary features for safe and precise temperature maintenance of the water in your tank or reservoir. The exclusive technology and the high quality of the components guarantee a long lasting product.... more

    $48.85

    FREE shipping

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    "Hydor Theo Heater 300 Watt for 53-80 Gallons (24/Cs)"

    "Hydor Theo Heater 300 Watt for 53-80 Gallons (24/Cs)"

    "Theo reservoir & aquarium heaters have all the necessary features for safe and precise temperature maintenance of the water in your tank or reservoir. The exclusive technology and the high quality of the components guarantee a long lasting product. " more

    $29.56

    FREE shipping

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    Hydor Theo UL Aquarium Heater 50 watts

    Hydor Theo UL Aquarium Heater 50 watts

    Hydor Theo Super Safe, Shatter Proof Heating Control your aquarium's temperature safely and precisely with the THEO aquarium heater . The THEO is suitable for marine and tropical aquariums. The THEO heater can be positioned in any way: vertically,... more

    $17.49

    FREE shipping

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    Hydor 300W Theo Aquarium Heater

    Hydor 300W Theo Aquarium Heater

    Theo reservoir & aquarium heaters have all the necessary features for safe and precise temperature maintenance of the water in your tank or reservoir. The exclusive technology and the high quality of the components guarantee a long lasting product.... more

    $46.19

    FREE shipping

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