I standard outlet should carry a 750 or 1,000 watt heater. a 1,500 watt model would be pushing it since you may also have lights, etc. going. don't try to run a microwave, coffee pot, etc. at the same time as the heater.
You could run a second line into the house if possible and run two small heaters.
2017 SLX 195RB
2014 Jeep Grand Cherokee Overland, gas 3.6 V6
Andersen WDH hitch
Dometic Milenco Aero mirrors