240 Cadet heater plug question 4k watt
I bought a Cadet twin 4000 watt heater from the Home Depot. What I am looking at doing is building a box (to house the heater) and installing a plug from the heater wiring so that I can plug the heater into my 50 amp 220 outlet in the wall,(Currently my welder outlet) and unplug it when not in use.
I have the compatible wall plug in was wondering how to wire this in, as I am not an electrician, The heater has 2 wires coming out of it, with no grounds. Will the 50 amp breaker be too much for it?, and does my 3rd wire from the plug just get directly grounded to the heater? Any help would be greatly appreciated.
The reasoning for this is to have a backup heater to kick on if my boiler fails, as I only have oil hw baseboard heat in my home, and want to avoid accidental freeze up, If I were to leave town for a few days. Also if the same thing will work if I were to plug it into my dryer outlet?