i should have mentioned that i have checked and tested successfully

1. the outlet lit up a bulb
2. the screw in adapter and 3 prong plug adapter worked in the house lamp
3. the outdoor cord was connected to and ran the table saw

I replaced a badly taped plug from the po. so i am still looking at the cord or heater. but with the other ideas hear maybe i don't need it.

whats the opinion here between block heaters and the hot water heaters?