The hydronic surface heater product line is designed to quickly, easily and economically thaw frozen ground, cure concrete, prevent frost and provide temporary air heat during cold weather conditions. The E1100 thaws up to 2,200 sq. ft. of frozen ground at an average of one-foot-deep per day. The E 1100 will also set, finish and cure 2,200 sq. ft. of concrete; up to 6,600 sq. ft. with accessories. At 85% efficiency, the E 100 offers the highest in the industry.