Hydor Theo are Shatterproof Heaters. If your one of these who are constantly moaning about broken or unreliable heaters then the a Hydor Theo heater addresses the problem. The first shatter-proof heater thanks to the peculiar glass tube.

These are top heaters in the hydroponics market and are of the smallest and most compact. The THEO is shock resistant thanks to the PTC heating element and the shatterproof glass tube.

Free positioning in tank with supplied suction cups.

Extremely safe - thanks to the automatic overheating control system to the PTC heating film. The patented PTC heating system guarantees operation in complete safety because in case of dry running there is no danger for damage.

High tech micro-switch for exceptional heater durability and excellent temperature control. Completely submersible, works in both horizontal and vertical position

They also have a self limiting function so if your water runs dry theres no need to worry !