Patton Heater Model Poh2501 Manual //top\\

: Plug the unit directly into a standard 120V wall outlet. Avoid using extension cords unless they are heavy-duty and rated for at least 1500 watts. Thermostat & Heat Settings Turn the thermostat knob clockwise to the maximum setting.

Automatically shuts off the unit if it is knocked over.

Taken directly from the safety section of the standard Patton manual:

Patton has been in the appliance business for decades. If your POH2501 is older than 10–15 years, check the manufacturer label. Older utility heaters lack the now required by UL standards (UL 1278). If yours doesn't have a weighted switch on the bottom, never leave it unattended.