(Miraco) Now a waterer that requires no electricity, so it saves 100% of your energy costs. University testing showed that the fountain worked when temperatures were at -100 degrees wind chill and never required any external energy source. Eliminates algae problems as water is not exposed to sunlight. Waterers work on the same principle as a thermos bottle. Water enters the Mirafount at 45 to 48 degrees. The floats seal the water away from outside. Whenever an animal drinks, it removes a quantity of water which is immediately replaced by ground water through the valve. This exchange of water keeps the water warm even in the coldest climate. Tested in continental U.S. to remain frost-free with as few as 6 head drinking every other day.