My dad built one from an old electric stove. Take off one of the burners and wires for that burner. Put the burner in the bottom of an old refrigerator and drill a hole to run the control wires to the outside. Put a thermometer through another hole into the refrigerator. You can even put wood chips on the burner in the bottom to get some smoke rolling. After playing with it we put marks by the control so we knew about what the temperature would be. worked great.