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. For use in freshwater and marine aquariums. The 50W & 100W/150W models, at 7" & 8.9" respectively, are among the smallest sized heaters on the market. The Theo "minimum water line" requirement must be followed for proper operation.

Features:

• 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 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.

• Complete range: 3 new sizes 25W, 150W and the unique 400W.

• 15.5" Length

• Two year manufacturer`s warranty.