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.
I have owned MANY, let me STRESS- MANY, heaters. I decided to try the Jager brand. I have it connected to a controller and it works very well. The build is robust, not flimsy plastic. Compared to other heater, this is accuracy- which is important. Remember all heater will fail with age, but if I get a solid 3-5years with this ( and they have been known to) then I will be happy. oversize your heater or double your heaters to provide less demand on your heaters makng their elements less prone to failure. Bigger is better in this case.