Electric heaters for industrial and commercial use, namely, drum and tote heaters, drum and tote blanket heaters and thermal insulation blankets, heating systems for silos, hoppers and tanks, high aspect ratio heating systems for silos and hoppers, heat trace cables to prevent freezing of pipes, valve and manifold heating units, heating systems to prevent freezing of fire extinguishing sprinklers, industrial process pre-heating and heating systems, electric heating blankets and elect...