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The use of wire mesh floor heating systems to store heat developed from low-cost electrical energy during off-peak hours was investigated for large resource industries. These systems have the double function of heating and reinforcing. As current increases in the steel magnetic wire, resistance decreases due to skin effect. Current follows the shortest path along the longitudinal wires with relatively little flow in the transverse wires. The resistance of the mesh electrical leads must be low to avoid making them heaters. The mesh heat output is regulated by voltage which varies directly as circuit length.