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Hydor Heater THEO UL 100 WattConsumer Rating :Price Range : $15.00 - $46.00 The Hydor Theo heater line features PTC patented thermal technology which makes it among the safest aquarium heater lines on the market. UL listed by design, not by the use of accessories. Made from specially engineered shatterproof glass which, while not unbreakable, is designed to resist breakage in most normal aquarium situations. Highly accurate due to the use of precise micro-switch technology. Free positioning in the aquarium, suction cups provided. Can set the heater vertically or horizontally. The unit is completely submergible. Self limiting: the patented PTC heating system guarantees operations in complete safety because in case of dry running there is no danger for damage. For use in freshwater and marine aquariums. | Merchant Offers
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 | THEO UL HEATER 100WNew aquarium heater functioning with the exclusive PTC(Positive Thermal Coefficient) technology. The firstshatter-proof heater thanks to the pe... more at PetSolutions |  | Only $16.64 |
 | Theo Heater 100 wattPatented heating element automatically turns off if water level declines more at Foster and Smith Aquatics |  | Only $16.79 |
 | HYDOR THEO 100W SUBMERS HEATERTHEO 100 WATT SUBMERSIBLE SHATTERPROOF HEATER 8.9" more at Amazon Marketplace |   | Only $19.99 |
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