Anyone have any success with heating mats or electric heaters available at Midewest, NB or Adventures in Home Brewing? How about brew belts? The other option I've seen is using an aquarium heater to warm up water surrounding your primary. I ran a test of this yesterday, but I think my heater is busted as it did not stay on long enough to warm the water. Plus, the primary bucket started to float in the water. If I got a new aquarium heater, would having the primary bucket float during fermentation cause any problems? (slight movement while it floats). Just wondered what the cheapest/easiest way to warm up my yeast is during the winter. I have my primary on the 2nd floor with a bunch of blankets on it, but my wife wants her blankets back...