Is there any brand/style of tank heaters that are more energy efficient? I have an all aluminum tank heater. It was the most expensive one at the feed store at $64.00. It's guaranteed for 3 years. It draws 1500 watts of power though. In fact, they all draw 1500 watts. That equates to about a $100.00 increase in my electric bill a month when the heater is on. OUCH! I would love to find a more cost effective unit to run. Currently, I plug in the heater for an hour, enough to thaw the tank and warm the water and then turn it off. I do this several times a day. There must be an easier way. In the winter, it is cheaper to feed my horses than to provide water for them!