0 items

view cart

Questions? Call 1-888-THAT-PET
Shop By Category

    THEO Heater - 25W - Up to 7 gal.


    Item # 205248 / Manufacturer Part # T11702

    Was $18.99
    Now $18.99
    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 PTC (Positive Thermal Coefficient) heating element, a special polymer sheet silk-screened with heating ink (like your car's windshield defroster), that enables them to run dry for a short time without damage. With an easy-to-read temperature dial, these heaters are the simplest, yet safest available.

    25w model is rated for 2-7 gallon aquariums.

    For complete product information, download the instruction manual.
    Length7 in.
    Width0.75 IN. DIAMETER
    Max Wattage25
    Warranty2 year
    UL ListedYes

    For complete product information, download the instruction manual.

    Average Rating

    Hydor Theo 25W defective 4/9/2016

    Reviewer: LC

    When I first put this heater in my tank, it went on and off randomly although it wasn't near the temperature at which was set. I returned it. The heater is very small, but I'm not sure that's a good quality. The smaller the heater element, the smaller the surrounding area of water that gets heated.

    Great heater for small tank 11/18/2013

    Reviewer: dowrite

    Excellent consistency.

    Works quite well 7/25/2013

    Reviewer: Nicole

    Very pleased, does a great job in my Fluval Edge 6 gallon.

    Really powerful little heater 6/12/2013

    Reviewer: Brian C.

    I bought this heater to use in my Fluval Spec V nano reef tank. This thing is GREAT! Heats up the water quickly, and its slim profile fits in the pump chamber with room to spare, although I had to nix the suction cups (no big deal, though). I highly recommend.

    Related Items
    Floating Thermometer - Economy

    Floating Thermometer - Economy


    Prime - 1.7 oz.

    Prime - 1.7 oz.


    Fluval Spec V Aquarium Kit - 5 gal. - Black

    Fluval Spec V Aquarium Kit - 5 gal. - Black


    Fluval Nano Thermometer

    Fluval Nano Thermometer