Here is what my pre-set heater is:
Brand = Tetra
Model = HT10
Watts = 50 ~ This one is for tanks anywhere from 2-10 gallons, thus the wattage.
Even though I have only had the heater about a week, it's already been tested with cooler temperatures. It's been cold lately (in the 30's-40's some nights - I leave the house temperature set at around 68) and the tank temperature has been kept at a steady 78 degrees. I've checked it with both one of those stick on LED tank thermometers, and my own digital meat thermometer.
All I can say is that from my personal experience, this particular pre-set works just fine for my 2.5 gallon tank.
Last edited by wystearya; 10-07-2010 at 06:22 AM.