Line voltage thermostats control the electricity directly, thus the name line voltage. If you have a baseboard heater, electric wall heater, or most and resistive electric heater you may require a line voltage thermostat. these thermostats generally are made for either 2 wires (SPST) or 4 wires (DPST - more common).
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Line voltage thermostats are great baseboard thermostats, electric wall heat thermostats, heat strip thermostats or for any direct line voltage system.