Finland's New Invention Could Make Oil Furnaces Obsolete

Finland's New Invention Could Make Oil Furnaces Obsolete A small Finnish town just went through its hardest winter in years, and the oil boiler that backs up its heat never fired once. What replaced it is a sand battery, a steel silo holding two thousand tons of crushed soapstone left over from a fireplace factory. Konrad Fischer explains how it stores cheap electricity as heat, why a wood chip boiler carried the coldest stretch of winter, whether this could replace the oil furnace in your basement, and the German saying behind it all. Next, watch The German Stove That Heats a House on twelve dollars and One Log a Day.