I just bought a 14 gauge 15 amp medium cord is it okay to connect a 1500 watt electric oil filled stand up heater into it and plug into my wall outlet.

No, it is not OK. You need a heavy duty extension cord and at least 12 gauge wire (20 amp). How long is the cord?

Technically the cord can handle the load, temporarily. It is not sufficient for a continuous load. A heating load is considered continuous. You'd need a cord rated at 125% of the load or 1875 watts.

Hope that helps.

Hope that helps.

More fires are caused by improper use of extension cords than any other item. Make your extension cord selection wisely.

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The Sparky dial.