New and improved design is now fully submersible! Automatic aquarium heater is for both fresh and saltwater aquariums. Unit has a precision bi-stable thermostat with plus or minus 1/2 degree F holding temperature. Temperature is now easier to set with a new dial and accurate 1 in. increments from 65 to 93 degrees. Jagers have a 2mm thick thermal shock resistant glass vs. the common 1mm thickness for and extra sturdy construction. Heater also includes a 6 foot double insulated power cord, and a convenient clip-on heater holder.
Recently bought this in November so I cant give a long term review. i use this in my 25 gallon ecoxotic cube which i have in my basement that hovers around 68F (pretty cold) This does the trick as my last heater bit the dust. But with all heater they tend to fail with age, if this lasts 3 years I will be really impressed.