Provides automatic temperature control for all types of portable space heaters that operate on electricity. It is safe, easy to use and plugs into an existing 120V outlet. Designed for indoor use, the model 18700 thermostat adds safety, comfort and convenience to workshops, garages and farm buildings. It also can provide winter protection against damage caused by freezing water pipes if your heating system fails when you’re not home. Temperature range: 0ºF to 100ºF. 120VAC with a 3-prong grounded plug and receptacle. Metal housing for heavy-duty use. Should be used with GFCI protected outlet.