Heaters have built-in temperature sensors which automatically cuts the power to the heater if it accidentally comes in contact with air. Maintains water temperature within +/-2ºF of the set value providing a safe, healthy, and stable temperature for your tank.
Our Price: $34.90
...you folks actually took the time to answer my questions. I know good customer service when I see it! Thanks for taking the time to respond to my e-mail, I am sure I'll be back when I need something else. Thanks!