. Putting it at the bottom of a 55 gallon keg doesn't freeze my drinking water here in the frigid north. I've bought these before and they seem to last a long time. I'm very happy for that.
Pros
CONSTANT TEMPERATURE: Includes an attached thermostat capable of heating from 0 to 250 degrees Fahrenheit (-17.8°C to 121.1°C); Once the silicone heating pad reaches the desired temperature, it reduces power consumption to maintain the selected temperature (± 5°F / 3°C); Warning - very hot, use the supplied thermostat
Cons
to control the temperature. You could have chosen the newer model