The Theo range of heaters is our recommended choice of tank heater. Initially, they are a little more expensive to purchase, but you will find that they last longer than a standard glass heater and are a much safer option to use.
Theo water heaters have all the necessary features for safe and precise temperature maintenance of the water in your tank.
The main features that sets these apart from others is the heating pad within the casing (instead of an element), and the hard, shatter resistant glass casing. The heater does not suffer from thermal shock - the heater can be removed from the tank before it has cooled. And if accidentally knocked against something while hot, the heating component will not not break like a standard glass heater's element.
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Can be mounted vertically and horizontally
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No Thermal Shock
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Fully Submersible
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Easy to set dial - clicks every 0.5C increments
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Very safe